EP3749894B1 - Appareil de puits de lumière - Google Patents

Appareil de puits de lumière Download PDF

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Publication number
EP3749894B1
EP3749894B1 EP19705900.9A EP19705900A EP3749894B1 EP 3749894 B1 EP3749894 B1 EP 3749894B1 EP 19705900 A EP19705900 A EP 19705900A EP 3749894 B1 EP3749894 B1 EP 3749894B1
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EP
European Patent Office
Prior art keywords
light
color point
resembling
color
sun
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19705900.9A
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German (de)
English (en)
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EP3749894A1 (fr
Inventor
Bernd P. Keller
Theodore D. Lowes
Michael Leung
Benjamin A. Jacobson
Eric Tarsa
James Ibbetson
Claudio Girotto
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Cree Lighting USA LLC
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Cree Lighting USA LLC
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Filing date
Publication date
Priority claimed from US15/972,176 external-priority patent/US10465869B2/en
Priority claimed from US15/972,178 external-priority patent/US10451229B2/en
Application filed by Cree Lighting USA LLC filed Critical Cree Lighting USA LLC
Publication of EP3749894A1 publication Critical patent/EP3749894A1/fr
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Publication of EP3749894B1 publication Critical patent/EP3749894B1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F21S8/026—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • F21V33/006—General building constructions or finishing work for buildings, e.g. roofs, gutters, stairs or floors; Garden equipment; Sunshades or parasols
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present disclosure relates to lighting fixtures and in particular to lighting fixtures that emulate skylights.
  • a skylight is a window that is generally installed in a roof or ceiling.
  • Skylights are excellent sources of natural light and highly desirable in many residential and commercial buildings. Providing natural light to an area is known to enhance moods, increase productivity, and improve ambiance among many other benefits. Skylights are often used to supplement the natural light in spaces with windows, and are often the only way to provide natural light to interior spaces that are not abutting exterior walls.
  • the skylight fixture has a sky-resembling light assembly and a plurality of sun-resembling light assemblies.
  • the sky-resembling light assembly has a specific optical assembly and a specific light source, wherein light from the light source exits a planar interior surface of the optical assembly as sky resembling light.
  • the plurality of sun-resembling light assemblies are arranged adjacent one another and extend downward from a periphery of the sky-resembling light assembly.
  • Each of the plurality of sun-resembling light assemblies has a specific optical assembly and a specific light source, wherein light from the light source exits a planar interior surface of the optical assembly as sun resembling light.
  • the planar interior surfaces of the sky-resembling optical assembly and the plurality of sun-resembling optical assemblies define a cavity.
  • One or more control modules alone or in a collective are configured to, in a first mode, drive the sky-specific light source and each sun-specific light sources such that the sky-resembling assembly has a light emission with a first color point and the at least one of the sun-resembling assemblies has light emission with a second color point that is different from the first color point.
  • the skylight assembly is configured to emulate a window of a traditional skylight.
  • Each of the plurality of sunlight assemblies is configured to emulate sunlight passing through and/or reflecting off of sidewalls of the traditional skylight.
  • one or both of the sky-specific light source and the sun-specific light source comprise first LEDs that emit light having a third color point, second LEDs that emit light having a fourth color point, and third LEDs that emit light having a fifth color point.
  • An interior angle formed between the planar interior surface of the sky-resembling optical assembly and the planar surface of each of the sun-resembling optical assembly is an obtuse angle. According to the invention, the interior angle is greater than 90 degrees and less than or equal to 135 degrees; greater than or equal to 95 degrees and less than or equal to 130 degrees; or greater than or equal to 100 degrees and less than or equal to 125 degrees.
  • the x coordinate value of the first color point and the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram differ by at least 0.1.
  • the first color point falls within a first color space defined by x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.37, 0.34), (0.35, 0.38), (0.15, 0.20), and (0.20, 0.14).
  • the second color point falls within a second color space defined by x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.29, 0.32), (0.32, 0.29), (0.41, 0.36), (0.48, 0.39), (0.48, 0.43), (0.40, 0.41), and (0.35, 0.38).
  • the x coordinate value of the first color point and the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram differ by at least 0.1.
  • the first color point falls within a first color space defined by x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.32, 0.31), (0.30, 0.33), (0.15, 0.17), and (0.17, 0.14).
  • the second color point falls within a second color space defined by x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.30, 0.34), (0.30, 0.30), (0.39, 0.36), (0.45, 0.39), (0.47, 0.43), (0.40, 0.41), and (0.35, 0.38).
  • the x coordinate value of the first color point and the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram differ by at least 0.1.
  • the first color point falls within a first color space defined by x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.39, 0.31), (0.34, 0.40), (0.10, 0.20), and (0.16, 0.06).
  • the second color point falls within a second color space defined by x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.28, 0.36), (0.35, 0.26), (0.44, 0.33), (0.62, 0.34), (0.50, 0.46), (0.43, 0.45), (0.36, 0.43).
  • the x coordinate value of the first color point and the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram differ by at least 0.1.
  • the first color point falls within a first color space defined by x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.10, 0.20), (0.36, 0.43), (0.43, 0.45), (0.50, 0.46), (0.62, 0.34), (0.44, 0.33), (0.16, 0.06).
  • the second color point falls within a second color space defined by x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.10, 0.20), (0.36, 0.43), (0.43, 0.45), (0.50, 0.46), (0.62, 0.34), (0.44, 0.33), (0.16, 0.06).
  • the x coordinate value of the first color point and the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram differ by at least 0.15. In another embodiment, the x coordinate value of the first color point and the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram differ by at least 0.2.
  • the x coordinate value of the first color point is less than the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram.
  • the y coordinate value of the first color point is less than the y coordinate value of the second color point on the 1931 CIE Chromaticity Diagram.
  • both the x coordinate value of the first color point is less than the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram and the y coordinate value of the first color point is less than the y coordinate value of the second color point on the 1931 CIE Chromaticity Diagram.
  • the x coordinate value of the first color point and the x coordinate value of the second color point on the 1931 CIE Chromaticity Diagram may differ by at least 0.15, 0.2, and 0.25.
  • the sky-specific light source comprises first LEDs that emit light having a third color point, second LEDs that emit light having a fourth color point, and third LEDs that emit light having a fifth color point.
  • the third color point, the fourth color point, and the fifth color point are spaced apart from one another on the 1931 CIE Chromaticity Diagram by at least 0.05 in at least one of x and y directions.
  • the first LEDs may emit white light, and the third color point may be within three, five, seven, or ten MacAdams Ellipses of a blackbody curve.
  • the second LEDs may emit bluish light
  • the third LEDs may emit greenish light
  • the y coordinate value of the fourth color point and the y coordinate value of the fifth color point on the 1931 CIE Chromaticity Diagram may differ by at least 0.1, 0.15, or 0.2.
  • At least two of the sun-specific light sources may have fourth LEDs that emit light having a sixth color point, fifth LEDs that emit light having a seventh color point, and sixth LEDs that emit light having an eighth color point.
  • the sixth color point, the seventh color point, and the eighth color point may be spaced apart from one another on the 1931 CIE Chromaticity Diagram by at least 0.05, 0.1, or 0.15 in at least one of x and y directions.
  • At least two of the sun-specific light sources have first LEDs that emit light having a third color point, second LEDs that emit light having a fourth color point, and third LEDs that emit light having a fifth color point.
  • the third color point, the fourth color point, and the fifth color point spaced may be apart from one another on the 1931 CIE Chromaticity Diagram by at least 0.05, 0.1, or 0.15 in at least one of x and y directions.
  • the sky-resembling light assembly and the sun-resembling light assembly may provide a composite light output that has a color rendering index of greater than 90.
  • the one or more control modules may be further configured to independently and variably drive the sky-specific light source and each sun-specific source such that the first color point and the second color point are independently variable.
  • the one or more control modules may be further configured to drive the sky-specific light source and each sun-specific light source such that the first color point and the second color point change temporally.
  • the one or more control modules may be further configured to drive the sky-specific light source and each sun-specific light source such that the first color point and the second color point are selected based on a time of day.
  • the one or more control modules may be further configured to drive the sky-specific light source and each sun-specific light source such that the first color point and the second color point are selected based on information received from a remote device.
  • the one or more control modules may be further configured to drive the sky-specific light source and each sun-specific light source such that the first color point and the second color point are selected based on sensor information provided by at least one sensor.
  • the one or more control modules may be further configured to drive the sky-specific light source and each sun-specific light source such that the first color point and the second color point are selected based on outdoor lighting conditions.
  • the one or more control modules may be further configured to drive the sky-specific light source and each sun-specific light source such that the first color point and the second color point are selected based on outdoor weather conditions.
  • the one or more control modules may be further configured to drive the sky-specific light source and each sun-specific light source such that the first color point and the second color point are selected based on outdoor environmental conditions.
  • the one or more control modules may be further configured to, in a second mode, drive the sky-specific light source and each sun-specific light source to change the first and second color point to provide a circadian stimulus.
  • the one or more control modules may be further configured to, in a second mode, drive each sunlight light source to change the second color point of the sunlight light provided by each sunlight source to have additional red spectral content.
  • the one or more control modules may be further configured to communicate with other skylight fixtures and drive the sky-specific light source and each sun-specific light source such that the sky-specific emission and sun-specific emission is coordinated with that from the other skylight fixtures.
  • the skylight fixture has a sky-resembling assembly and a plurality of sun-resembling assemblies.
  • the sky-resembling assembly has a sky-resembling optical assembly and a sky-specific light source, wherein light from the sky-specific light source exits a planar interior surface of the skylight optical assembly as skylight light.
  • the plurality of sun-resembling assemblies are arranged adjacent one another and extend downward from a periphery of the sky-resembling assembly.
  • Each of the plurality of sun-resembling assemblies has a sun-resembling optical assembly and a sun-specific light source, wherein light from the sun-specific light source exits a planar interior surface of the sunlight optical assembly as sunlight light.
  • the planar interior surfaces of the skylight optical assembly and the plurality of sunlight optical assemblies define a cavity.
  • One or more control modules alone or in a collective are configured to, in a first mode, drive the sky-specific light source and each sun-specific light source such that the sky-specific light emission has a first color point and the sun-specific light emission of at least one of the plurality of sun-resembling assemblies has a second color point that is different from the first color point.
  • the sky-resembling assembly may be configured to emulate a window of a traditional skylight.
  • Each of the plurality of sun-resembling assemblies may be configured to emulate sunlight passing through and/or reflecting off of sidewalls of a traditional skylight.
  • FIG. 1 An exemplary skylight fixture 10 is illustrated in Figure 1 .
  • the skylight fixture 10 is mounted in a ceiling structure 12, which in the illustrated embodiment is a drop ceiling, such as that used in many commercial buildings.
  • the skylight fixture 10 may be installed in any type of ceiling structure 12, such as drywall, wood, masonry, and the like.
  • the skylight fixture 10 has the general appearance of and emulates a traditional skylight.
  • the skylight fixture 10 takes the general shape of an inverted box that has multiple sidewalls and a bottom wall.
  • the bottom wall is referred to as a sky-resembling assembly 14, and the sidewalls are referred to as sun-resembling assemblies 16.
  • the sky-resembling and sun-resembling assemblies 14, 16 are formed from light engines, the details of which are described further below.
  • the sky-resembling assembly 14 is configured to emit light and provide the appearance of the sky to a viewer. In essence, the sky-resembling assembly 14 emulates the window portion of a traditional skylight.
  • the sun-resembling assemblies 16 are configured to emulate the sidewalls of a traditional skylight. Generally, the sidewalls of a traditional skylight reflect the more directional sunlight emanating from the sun.
  • the sun-resembling assemblies 16 are configured to emulate sunlight coming through the skylight directly at a particular angle or being reflected off of a sidewall.
  • the sky-resembling assembly 14 is configured to provide the generally non-directional light associated with the sky, whereas the sun-resembling assembly 16 emulates the direct sunlight or a reflection thereof from the sun.
  • the intensity, color temperature, color of light emitted from the sky-resembling and sun-resembling assemblies 14, 16 will vary in an effort to emulate the light provided by a traditional skylight at different times of the day or night and any transitions therebetween.
  • FIGS 2A and 2B provide cross-sectional views of two different embodiments of the skylight fixture 10.
  • the sun-resembling assemblies 16 are essentially orthogonal to the sky-resembling assembly 14.
  • Opposing sun-resembling assemblies 16 are effectively parallel with one another.
  • the exposed surfaces of the sun-resembling assembly 16 form a 90 degree angle with the exposed surface of the sky-resembling assembly 14.
  • the exposed surfaces of the sun-resembling assembly 16 form an obtuse angle ⁇ with the exposed surface of the sky-resembling assembly 14.
  • increasing the angle between the exposed surfaces of the sun-resembling assemblies 16 and the sky-resembling assembly 14 may improve emulation of sunlight passing through the skylight fixture 10.
  • the obtuse angle ⁇ is: 90 degrees ⁇ ⁇ ⁇ 135 ; 95 degrees ⁇ ⁇ ⁇ 130 ; or 100 degrees ⁇ ⁇ ⁇ 125 .
  • the electronics module 18 provides the requisite electronics for the skylight fixture 10.
  • the electronics module 18 may include power supply electronics, control electronics, communication electronics, and/or the requisite driver circuitry for the sky-resembling and sun-resembling assemblies 14, 16.
  • dashed line arrows represent the "sunlight” emanating from the sky-resembling assembly 14, and the solid line arrows represent the "sunlight” emanating directly from or being reflected from the sunlight assembly 16.
  • Figure 3 illustrates two skylight fixtures 10 mounted in a ceiling structure 12 in a room with walls 22. While light may not be completely controlled, Figure 3 illustrates "sunlight” from the sky-resembling assembly 14 projecting predominantly downward into the room, wherein the "sunlight” (solid line arrows) from the sun-resembling assemblies 16 is projected into the room in a more angular fashion, such that the light emanated from the sun-resembling assemblies 16 illuminates and reflects off of the walls 22 in an effort to emulate sunlight coming through a traditional skylight at an angle and directly lighting up the walls 22 or being reflected off of a sidewall of a traditional lighting fixture and being reflected into the room at an angle.
  • both the sky-resembling and sun-resembling assemblies 14, 16 may be provided by various types of light engines.
  • the sky-resembling and sun-resembling assemblies 14, 16 in a particular skylight fixture 10 may incorporate the same or different types of light engines. If the same light engines are used for both the sky-resembling and sun-resembling assemblies 14, 16, these light engines may be configured the same or differently depending on the spectral capabilities of the light engines.
  • Figures 4-7 illustrate four different types of light engines.
  • the illustrated light engines are provided merely as examples, and do not represent an exclusive or exhaustive list.
  • the first type of illustrated light engine may take the form of a display device, such as a light emitting diode (LED) display, a liquid crystal display (LCD), an organic LED (OLED) display, or the like.
  • a typical display assembly 24 will include a display panel 26 on which images are displayed, and appropriate driver electronics 28 to drive the display panel 26. Based on the input of the driver electronics 28, the display panel 26 will display images in the desired manner.
  • the display assembly 24 is particularly beneficial as a sky-resembling assembly 14 due to the tremendous flexibility in scenes that can be displayed in an effort to emulate the appearance of the sky during any time of the day or night.
  • the display can simply provide a uniform color across the display to emulate the blue sky of day, the sunset in the evening, or the black at night.
  • the display can vary to indicate clouds, stars scattered in the night sky, the reddish orange light illuminating clouds during a sunrise or sunset, and the like.
  • incorporation of a display assembly 24 provides the flexibility of presenting anything from a specifically colored panel to specific still or moving images, which may be coordinated among multiple skylight fixtures 10.
  • inventions of Figures 5, 6, and 7 will generally not be capable of displaying particular images, but may project light of a varying intensity, color, and color temperature while appearing a particular color and brightness.
  • the light emanating from one of these light engines may be different from a color of the panel the light engine actually appears. For example, one may want the light engine to appear blue, but project white light.
  • the light projected from the light engines and the appearance of the light engines will be substantially uniform.
  • an edge lit-type light engine wherein an optical assembly 32 is edge lit with one or more light sources 34.
  • the optical assembly 32 may be a single or multi-layer optical waveguide, diffuser, lens, or any combination thereof.
  • the light sources 34 which are illustrated as LEDs but are not limited thereto, illuminate the edges of the optical assembly 32, and light is emitted from a front surface of the optical assembly 32.
  • the light source 34 will extend along all of at least one side of the optical assembly 32, if not multiple or all sides of the optical assembly 32.
  • the light engine 30 will include a light engine housing 36 to maintain the optical assembly 32 and the light source 34 in a proper orientation with respect to one another, as well as to allow the overall light engine 30 to be mounted in the skylight fixture 10.
  • the LEDs of the light source 34 may be the same or different colors, depending on the application. If LEDs of different colors are provided, the optical assembly 32 will facilitate the mixing of light from the various LEDs, such that light emanates from the front surface of the optical assembly 32 in a uniform manner.
  • FIG. 6 a back lit-type light engine 40 is illustrated.
  • An optical assembly 42 that has a front side and an opposing back side is provided.
  • a light source 44 such as an array of LEDs, is positioned to illuminate the back surface of the optical assembly 42, such that light emitting from the light source 44 passes through the optical assembly 42 and emanates from the front surface of the optical assembly 42.
  • the LEDs of the LED array of the light source 44 are spaced apart from the back surface of the optical assembly 42, wherein a mixing chamber 46 is provided between the light source and the back surface of the optical assembly 42. This allows LEDs of different colors of light to be used in the light source 44.
  • a light engine housing 48 may be provided to hold the optical assembly 42 and the light source 44 in a proper orientation to one another and allow mounting to the skylight fixture 10.
  • Figure 7 illustrates a side lit-type light engine 50, which is configured in a similar fashion to that of Figure 6 .
  • the LEDs of the light source 54 are provided on the sides of the mixing chamber 56 and perpendicular to the rear surface of the optical assembly 52. Light from the LEDs from the light source 54 will emanate into the mixing chamber 56, and ultimately through the optical assembly 52 such that mixed light emanates from the front surface of the optical assembly 52.
  • a light engine housing 58 may be provided to maintain the proper orientation of the optical assembly 52 and the light source 54, as well as provide the mixing chamber 56.
  • the LEDs of the light source 54 may provide different colors of light, wherein the mixing chamber 56 and the optical assembly 52 are configured such that light emanating from the front surface of the optical assembly 52 is of a desired color.
  • the light sources 34, 44, and 54 need not be LEDs; however, LED-based light sources provide energy efficient and high quality light, as will be described further below.
  • the optical assemblies 32, 42, and 52 may comprise one or more light/waveguides, diffusion films, lens films, diffusers, lenses, and the like.
  • Figure 8 illustrates a partial cross-section of a skylight fixture 10, wherein each of the sun-resembling assemblies 16 employs back lit light engines 40.
  • the optical assembly 42 is angled such that the exposed surface of the optical assembly 42 forms an obtuse angle with the exposed surface of the sky-resembling assembly 14, which may employ a display assembly 24, light engine 30, light engine 40, or light engine 50, as described above.
  • the light source 44 is an array of LEDs, wherein each LED of the array of LEDs is distributed along a vertical surface, which is orthogonal to the exposed surface of the sky-resembling assembly 14.
  • a mixing chamber is provided between the LED array and the back surface of the optical assembly 42.
  • the plane on which the LEDs reside may also be angled, wherein the plane on which the LEDs are arranged is parallel to the optical assembly 42. In other embodiments, the plane on which the LEDs reside is not vertical, yet need not be parallel with the optical assembly 42.
  • the appearance of the exposed surfaces of the sky-resembling and sun-resembling assemblies 14, 16 are configured to appear as a traditional skylight, which typically has painted, vertical side walls and a window.
  • the sun-resembling assemblies 16 may have optical assemblies 32, 42, 52, that have low gloss interior surfaces that are flat white in color. The interior surfaces are those that are visible once installed. The low gloss, flat white interior surfaces provide the appearance of the vertical side walls, which are typically painted flat white.
  • the sun-resembling assemblies 16 will be of high efficacy and provide a CRI equal to or greater than 85 or 90 in addition to providing an R9 equal to or greater than 50. Ultra-uniform color mixing and uniform luminance across the interior surfaces of the optical assemblies 32, 42, 52 enhance the emulation effect.
  • the interior surfaces of the optical assembly 32, 42, 52 of the skylight fixture 10 may be a matt diffuser.
  • the optical assembly 32 will include a highly reflective backing on the back surface, which is opposite the interior surface.
  • the sky-resembling assembly 14 should provide a CRI of or greater than 85 or 90 in addition to being color changeable.
  • the color can range from a sky blue to a very high correlated color temperature, such as white light within three, five, seven, or ten MacAdams ellipses of +/- 5% of 5000K or 5500K, depending on the embodiment.
  • Figure 9 illustrates an embodiment wherein multiple (six) skylight fixtures 10 are installed in a ceiling structure 12 in close proximity to one another to form an appealing matrix of virtual skylights.
  • the light and/or images provided/displayed by each of the skylight fixtures 10 may be the same or coordinated as desired.
  • the movement of the sun, the passing of clouds, movement of shadows and the like may transition from one skylight fixture 10 to another to form a composite display and/or lighting effect from the overall group of skylight fixtures 10.
  • Such operation may be tied to various sensors, information sensors, and the like, such that the light and/or information displayed by the skylight fixtures 10 corresponds to an associated outdoor environment.
  • each of the sky-resembling assembly 14 and the sun-resembling assemblies 16 may be configured the same or differently with respect to their lighting capabilities and characteristics. While different ones of the sun-resembling assemblies 16 may be configured differently on a given skylight fixture 10, they are generally configured the same on a given skylight fixture 10. Given the different objectives for the respective sky-resembling and sun-resembling assemblies 14, 16, the sky-resembling and sun-resembling assemblies 14, 16 may be designed to operate at different intensity levels, color spaces, color temperatures, distribution patterns, and the like as well as provide light at different efficacy levels or with different color rendering index values.
  • the different sky-resembling and sun-resembling assemblies 14, 16 may be designed and/or controlled such that each panel provides light with different characteristics, yet the light from the overall skylight fixture 10 combines to provide light with certain characteristics, which are different from that of either of the sky-resembling and sun-resembling assemblies 14, 16.
  • the sun-resembling assemblies 16 are designed to emulate the directional nature of sunlight passing through a traditional skylight.
  • the sky-resembling assemblies 14 are designed to emulate the appearance of the sky and the non-directional nature of sunlight passing through a traditional skylight.
  • the sky-resembling and sun-resembling assemblies 14, 16 may be further configured to emulate the appearance of light passing through or being reflected from window and side walls of the traditional skylight.
  • One of the more significant lighting characteristics in achieving these goals is the color space, and in particular, the color point at which the respective sky-resembling and sun-resembling assemblies 14, 16 operate.
  • the light exiting the sky-resembling assembly 14 is relatively shifted toward blue in the light spectrum to better emulate the appearance of a blue sky.
  • the light exiting the sun-resembling assembly 16 is relatively shifted toward the red in the light spectrum to better emulate the appearance of sunlight.
  • the light exiting the sky-resembling assembly 14 has a color point within a first skylight color space A.
  • the first skylight color space A is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.37, 0.34), (0.35, 0.38), (0.15, 0.20), and (0.20, 0.14).
  • the light exiting the sun-resembling assembly 16 has one or more color points within a first sunlight color space A.
  • the first sunlight color space A is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.29, 0.32), (0.32, 0.29), (0.41, 0.36), (0.48, 0.39), (0.48, 0.43), (0.40, 0.41), and (0.35, 0.38).
  • Both the sky-resembling assembly 14 and the sun-resembling assemblies 16 may be configured to vary the color points during operation to emulate and/or track changing conditions of outside environments throughout the day and night.
  • the light exiting the sky-resembling assembly 14 has a color point within a second skylight color space B.
  • the second skylight color space B is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.32, 0.31), (0.30, 0.33), (0.15, 0.17), and (0.17, 0.14).
  • the light exiting the sun-resembling assembly 16 has one or more color points within a second sunlight color space B.
  • the second sunlight color space B is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.30, 0.34), (0.30, 0.30), (0.39, 0.36), (0.45, 0.39), (0.47, 0.43), (0.40, 0.41), and (0.35, 0.38).
  • Both the sky-resembling assembly 14 and the sun-resembling assemblies 16 may be configured to vary the color points during operation to emulate and/or track changing conditions of outside environments throughout the day and night.
  • the first and second embodiments defined above provide relatively limited color spaces for the respective sky-resembling and sun-resembling assemblies 14, 16 to operate. These embodiments are geared toward emulating a traditional skylight during predominately daylight hours between, but not necessarily including, the sunrise and sunset where the sky may appear less blue and more reddish orange.
  • operation in expanded color spaces is beneficial. For example, the color spaces may need to be shifted or expanded to address the deeper blues associated with dusk, dawn, and nighttime as well as the more reddish orange and red hues associated with sunrise and sunset.
  • Exemplary enhanced color spaces for the sky-resembling and sun-resembling assemblies 14, 16 are provided in a third embodiment.
  • the light exiting the sky-resembling assembly 14 has a color point within a third skylight color space C.
  • the third skylight color space C is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.39, 0.31), (0.34, 0.40), (0.10, 0.20), and (0.16, 0.06).
  • the light exiting the sun-resembling assembly 16 has one or more color points within a third sunlight color space C.
  • the third sunlight color space C is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.28, 0.36), (0.35, 0.26), (0.44, 0.33), (0.62, 0.34), (0.50, 0.46), (0.43, 0.45), (0.36, 0.43).
  • Both the sky-resembling assembly 14 and the sun-resembling assemblies 16 may be configured to vary the color points during operation to emulate and/or track changing conditions of outside environments throughout the day and night.
  • the highlighted points in the graphs are exemplary color points for the respective sky-resembling and sun-resembling assemblies 14, 16.
  • the color spaces for both the sky-resembling and sun-resembling assemblies 14, 16 are greatly expanded and/or the same or substantially the same.
  • the skylight and sunlight color spaces are defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.10, 0.20), (0.36, 0.43), (0.43, 0.45), (0.50, 0.46), (0.62, 0.34), (0.44, 0.33), (0.16, 0.06).
  • Both the sky-resembling assembly 14 and the sun-resembling assemblies 16 may be configured to vary the color points during operation to emulate and/or track changing conditions of outside environments throughout the day and night.
  • the highlighted points in the graphs are exemplary color points for the respective sky-resembling (square points) and sun-resembling (triangular points) assemblies 14, 16.
  • the ccx value on the 1931 CIE Chromaticity Diagram of the color point of light exiting the sky-resembling assembly 14 may be less or about equal than the ccx value on the 1931 CIE Chromaticity Diagram of the color point of light exiting the sun-resembling assembly 16.
  • the ccy value on the 1931 CIE Chromaticity Diagram of the color point of light exiting the sky-resembling assembly 14 can be less or about equal than the ccy value on the 1931 CIE Chromaticity Diagram of the color point of light exiting the sun-resembling assembly 16.
  • both the ccx value on the 1931 CIE Chromaticity Diagram of the color point of light exiting the sky-resembling assembly 14 is less than or about equal the ccx value on the 1931 CIE Chromaticity Diagram of the color point of light exiting the sun-resembling assembly 16
  • the ccy value on the 1931 CIE Chromaticity Diagram of the color point of light exiting the sky-resembling assembly 14 is less than or about equal the ccy value on the 1931 CIE Chromaticity Diagram of the color point of light exiting the sun-resembling assembly 16.
  • the arrays of LEDs are used for one or both of the sky-resembling and sun-resembling assemblies 14, 16.
  • LED arrays are used for both the sky-resembling and sun-resembling assemblies 14, 16.
  • a two-color LED array is employed as the light source for the sky-resembling assembly 14.
  • a two-color LED array will have multiple LEDs of a first color and multiple LEDs of a second color.
  • the first LEDs are bluish LEDs that emit bluish light with a color point CP1 in the lower left of the 1931 CIE Chromaticity Diagram.
  • the bluish LEDs have a 475 nm dominant wavelength and an overall spectrum that is illustrated in Figure 18 , which is a graph of output intensity versus wavelength.
  • the second LEDs are a white LEDs that emit white light at a color point CP2 on or within three or five MacAdam Elilipses of the Black Body Curve.
  • the white LEDs have a color temperature of approximately 5000K (+/- 0.5, 1, 2, or 5%) and a color rendering index (CRI) of at least 85 or 90 (i.e. CRI 85, CRI 90).
  • the white LEDs have an overall spectrum that is illustrated in Figure 19 , which is a graph of output intensity versus wavelength.
  • the color point of light exiting the sky-resembling assembly 14 can vary along a tie line that extends between the color points associated with the bluish and white LEDs depending on the extent to which the respective LEDs are driven.
  • the color point of the light exiting the sky-resembling assembly 14 can vary in color along the tie line from white light with a color temperature of approximately 5000K to a sky blue.
  • Three exemplary color points for sky targets are shown as circles on the tie line. While a two-color LED array is cost effective and provides variable color points along a defined tie line, the overall spectrum associated with the light emitted from a two-color LEDs array is somewhat limited.
  • One way to increase the overall spectral gamut of the emitted light from the sky-resembling assembly 14 is two use three or more LEDs in the LED array. Using three or more colors in the LED array is beneficial, even if the design dictates varying color along a single, linear tie line.
  • An example of a three color-LED array is illustrated in the 1931 CIE Chromaticity Diagram of Figure 20 .
  • the deeper bluish LEDs emit bluish light with a color point CP3 in the lower left of the 1931 CIE Chromaticity Diagram.
  • the bluish LEDs have a 460 nm dominant wavelength, but can range from about 450nm to about 465nm in dominant wavelength as illustrated in Figure 21 , which is a graph of output intensity versus wavelength.
  • the greenish LEDs emit greenish light with a color point CP5 in the upper left of the 1931 CIE Chromaticity Diagram.
  • the greenish LEDs have a 520 nm dominant wavelength but can range from about 505 nm to about 530 nm in dominant wavelength as illustrated in Figure 22 , which is a graph of output intensity versus wavelength.
  • the white LEDs emit white light at a color point CP5 on or within three or five MacAdam Elilipses of the Black Body Curve.
  • the white LEDs have a color temperature of approximately 5000K (+/-0.5, 1, 2, or 5%) and a color rendering index (CRI) of at least 85 or 90 (i.e. CRI 85, CRI 90).
  • the white LEDs have an overall spectrum that is illustrated in Figure 23 , which is a graph of output intensity versus wavelength. While certain colors of LEDs are used in the described embodiments, LEDs of various colors and combinations thereof are considered within the scope of the disclosure.
  • the 1931 CIE Chromaticity Diagram of Figure 24 shows three exemplary color spaces for each of three colors of LEDs.
  • Color space CS1 resides in the upper left part of the diagram and corresponds to a greenish yellow LED that emits greenish yellow light.
  • Color space CS2 resides in the lower left part of the diagram and corresponds to a greenish blue LED that emits greenish blue light.
  • Color space CS3 resides in the lower right part of the diagram and corresponds to a reddish LED that emits reddish blue light. The combination of these three different colors of LEDs allows great flexibility in controlling the color and color temperature of the light exiting the sun-resembling assemblies 16.
  • a target range for the color space resides along the Black Body curve and extends from about 5600K to 2700K, inclusive, within three, five, seven, or ten MacAdams ellipses.
  • color space CS1 is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.337421, 0.498235), (0.361389, 0.547099), (0.345207, 0.557853), and (0.320079, 0.506653).
  • Color space CS2 is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.253872, 0.284229), (0.281968, 0.363411), (0.269385, 0.367235), and (0239191, 0.282521).
  • Color space CS3 is defined by the following x, y coordinates on the 1931 CIE Chromaticity Diagram: (0.547946, 0.298632), (0.532764, 0.307913), (0.586923, 0.341618), and (0.602105, 0.332400). Again, these are non-limiting examples that are provided for the purposes aiding those skilled in the art in understanding the concepts described herein.
  • the skylight fixture 10 provides both vertical and horizontal lighting components.
  • the vertical component is provided by the sky-resembling assembly 14, and the horizontal component is provided by the sun-resembling assemblies 16.
  • the sun-resembling assemblies 16 are not exactly vertical for the embodiment of Figure 26 , for the purposes herein, the sun-resembling assemblies 16 are considered to provide a horizontal lighting component.
  • These vertical and horizontal lighting components ultimately combine to provide a composite lighting component that exits the skylight fixture 10 at an exit plane, which is a plane corresponding to the opening of the skylight fixture 10 opposite the sky-resembling assembly 14.
  • the vertical and horizontal lighting components are independently controllable with respect to one or more of intensity, color, color temperature, CRI, and the like.
  • the emission profile associated with the composite lighting component which is effectively the output of the overall skylight fixture 10 can be tailored by controlling the vertical lighting component provided by the sky-resembling assembly 14 and the horizontal lighting components provide by the multiple sun-resembling assemblies 16.
  • the horizontal lighting components provided by the different sun-resembling assemblies 16 may be the same or different to provide both symmetrical and asymmetrical emission profiles.
  • the skylight fixture 10 may be designed to provide the functionality described above and still have the composite lighting component provide a desired emission profile with a desired color, color temperature, CRI, or any combination thereof.
  • the emission profile of the composite lighting component may have a normalized intensity distribution (i.e. substantially Lambertian Emission profile) to one that is substantially ellipsoidal, symmetrical, or asymmetrical.
  • the white light color quality of the composite light output of the overall skylight fixture 10 can be significantly improved.
  • the CRI of the composite light output of the overall skylight fixture 10 can be improved.
  • CRI an LED-based fixture's CRI is calculated by measuring its CRI ratings for various individual colors, which are referred to as R1 through R8, and then taking an average of the results.
  • R9 (red) and R13 (skin tone/beige) are generally not taken into consideration when calculating CRI.
  • These red and skin tone colors have a significant impact on rendering skin colors in a healthy and natural way as well as making people feel at ease and more alert. As such, lighting may have a high CRI and still lack the red and skin tone color content necessary to properly render skin tones and/or enhance mood and alertness.
  • the expanded spectrum provided by using LEDs of three or more colors for a given one of the sky-resembling and sun-resembling assemblies 14, 16 can improve the CRI rating as well as the perceived quality of the composite lighting component.
  • the expanded spectrum may also significantly improve the quality of the vertical and horizontal lighting components.
  • Figures 27 and 28 illustrate the improvement in both CRI and R9 of the composite lighting component when employing LEDs of three or more colors.
  • Figure 27 is a graph of CRI and R9 over distance from center Nadir (that is six feet from the fixture) for the two-color LED embodiment of Figure 17 . Center Nadir in this test is approximately six feet from the center of the exit plane of the skylight fixture 10.
  • Figure 28 is a graph of CRI and R9 over distance from center Nadir for the three-color LED embodiment of Figure 20 .
  • the CRI across the entire range significantly improved, and the CRI curve flattened, which indicates tremendous CRI improvement at lower distances.
  • the R9 also improved on average.
  • Figures 29 and 30 illustrate techniques for improving efficacy associated with the overall skylight fixture 10, the sun-resembling assemblies 16, or both.
  • Figure 29 illustrates the benefit of having an angle of greater than 90 degrees between the interior face of the sun-resembling assemblies 16 and the sky-resembling assembly 14.
  • the light output distribution of the sun-resembling assemblies 16 favors toward the exit plane, or in other words, is angled downward toward the exit plane.
  • Angling the light output distribution of the sun-resembling assemblies 16 downward reduces the losses associated with the light being passed through and reflected by the light emitting surfaces of the other sun-resembling assemblies 16 and the sky-resembling assembly 14.
  • experiments have shown particularly effective performance when the obtuse angle ⁇ is: 90 degrees ⁇ ⁇ ⁇ 135 ; 95 degrees ⁇ ⁇ ⁇ 130 ; or 100 degrees ⁇ ⁇ ⁇ 125 .
  • Figure 30 illustrates another embodiment not according to the claimed invention wherein the interior surfaces of the sun-resembling assemblies 16 are substantially vertical, but the optical configuration of the sun-resembling assemblies 16 are such that the light output distribution of the sun-resembling assemblies 16 is directed or redirected to favor toward the exit plane, or in other words, is angled downward toward the exit plane.
  • This can be provided by angling the plane on which the LED array is provided, employing a diffusor or waveguide structure to redirect the light from the LED array, or the like.
  • Allowing more of the light from the sun-resembling assemblies 16 to escape the skylight fixture 10 without impediment may also increase the emulation of sunlight passing through a traditional skylight at lower angles and more directly illuminating walls, such as during the morning or evening as well as during those fall, winter, and spring months of the year when the earth remains off axis relative to the sun (i.e. the sun is lower on the horizon through the day).
  • the respective sky-resembling and sun-resembling assemblies 14, 16 can be individually controlled such that light provided by the sky-resembling and sun-resembling assemblies 14, 16 can emit light at different color points at any given time.
  • the particular color points for the light from the sky-resembling and sun-resembling assemblies 14, 16 may be permanently fixed or dynamically controlled such that the color points for the emitted light can change based on user input, a predefined program, or as a function of any number or combination of variables.
  • the variables may range from date, day, and time of day to any number of sensor outputs, such as indoor and/or outdoor temperature sensors, light sensors, motion sensors, humidity sensors, rain sensors, and the like.
  • the sky-resembling and sun-resembling assemblies 14, 16 may be further controlled such that the composite lighting output of the skylight fixture 10 achieves a certain color, color temperature, CRI, and/or the like while achieving other lighting goals, such as emulating a traditional skylight in a fixed or dynamic manner. While emulating a traditional skylight has been the subject of much of the discussion thus far, the sky-resembling and sun-resembling assemblies 14, 16 may be controlled to enhance moods, support general and mental health, and/or provide other physiological benefits.
  • the skylight fixture 10 may be configured to deliver an enhanced circadian stimulus, with reference to Rea, M.S. et al; A model of phototransduction by the human circadian system; Brain Research Reviews 50 (2005) 213 - 228 . This is done by controlling the ratio between the horizontal and vertical illuminance provided by the sky-resembling and sun-resembling assemblies 14, 16.
  • the circadian stimulus is controlled by the spectral power distribution, the color temperature and the amount of light of the respective characteristics delivered to the human eye.
  • the skylight fixture 10 by virtue of its vertical and horizontal light emitting surfaces along with independent spectral and brightness control, can provide effective control of this stimulus.
  • Controlling the sky-resembling and sun-resembling assemblies 14, 16 to provide a zonal luminance distribution of 35% or more in a region of 60-90 degrees of nadir will provide a higher vertical illuminance. This could be provided by increasing the brightness of the sun-resembling assemblies 16 and decreasing or maintaining the brightness of the sky-resembling assembly 14. Further, light with a higher amount of red spectral content may be emitted from the sun-resembling assemblies 16, further modulating the circadian or other alertness stimulation, as desired.
  • the skylight fixtures 10 may control the characteristics of light throughout the day based on when and how much circadian stimulus is desired.
  • the skylight fixture 10 will increase its 60-90 degree illuminance to 35% or more and change the spectral power distribution and/or system vertical illuminance to provides a circadian stimulus of > 0.3, which is a preferred circadian entrainment for humans according to Rea MS, Figueiro MG, Bierman A, Bullough JD.; J Circadian Rhythms; 2010 Feb 13;8(1):2 .
  • the skylight fixture 10 could reduce its circadian stimulus by providing a spectral power distribution and system vertical illuminance that results in a circadian stimulus of ⁇ 0.1.
  • One element of this reduction could be a change of the 60-90 degree zonal illuminance distribution 35% or less by modifying the sky-resembling and sun-resembling assembly 14, 16 emission (brightness and/or spectral content) ratios.
  • the red spectral content provided by the sun-resembling assemblies 16 can be temporarily increased to increase the red vertical illuminance provided by the skylight fixture 10 during post lunch hours and/or at night to counter the so called "post-lunch dip" and/or to improve nighttime alertness of shift workers.
  • the red spectral content provided by the sun-resembling assemblies 16 can be temporarily increased to increase the red vertical illuminance provided by the skylight fixture 10 during post lunch hours and/or at night to counter the so called "post-lunch dip" and/or to improve nighttime alertness of shift workers.
  • Each of the skylight fixtures 10 may be controlled collectively by a remote source, by a master fixture, or in a distributed fashion to operate in concert to present a static or dynamic scene.
  • Each of the skylight fixtures 10 may have different or the same light output of the respective sky-resembling and sun-resembling assemblies 14, 16, depending on the nature of the scene.
  • each of the skylight fixtures 10 may provide the same light output for a scene, such that each of the skylight fixtures 10 has the same appearance for a uniform scene.
  • two or more of the skylight fixtures 10 will have different light output configurations, wherein each skylight fixture 10 represents a portion of an overall scene.
  • the skylight fixtures 10 may also be controlled to provide virtually any type of mood, theme, holiday, or like lighting as well wherein the color, color temperature, brightness, and spectral content of the light emitted from the sky-resembling and sun-resembling assemblies 14, 16 is only limited by the nature and capabilities of the light sources and the control thereof.
  • the skylight fixtures 10 may be controlled or configured to operate in different modes at different times or in response to sensor input or outside control input.
  • the skylight fixtures 10 may function to emulate a traditional skylight with a changing scene that tracks outside conditions during business hours and transitions to decorative accent lighting mode during non-business hours.
  • the skylight fixtures 10 may transition to a mode that enhances alertness or provides some other type of circadian stimuli after normal business hours.
  • control may be provided by a programming of the skylight fixture or remote control in isolation or based on various input from other sensors and the like.
  • the independent control and the potential for different capabilities and configurations of the respective sky-resembling and sun-resembling assemblies 14, 16 provide tremendous flexibility for a skylight-shaped lighting fixture.
  • FIG 31 shows a block diagram of a skylight fixture 10 that is capable of providing wired or wireless communications with a remote device 51.
  • the remote device 51 may be another lighting fixture or skylight fixture 10, a remote control system provided on a server, personal computer, or the like, as well as a mobile computing device, such as a smart phone, commissioning tool, dedicated control module, and the like. Communications between the electronics module 18 and the remote device 51 may be wired or wireless and may work on any type of networking technology.
  • the remote device 51 will include a central processing unit (CPU) 53 or the like, and associated memory 55, which will include the requisite software for controlling operation of the remote device 51 and communications with the electronics module 18.
  • the CPU 53 may be associated with a communication interface 57, which will provide the requisite communication capability for the remote device 51.
  • Figure 32 illustrates an exemplary electronics module 18 in association with a sky-resembling assembly 14 and one or more sun-resembling assemblies 16 for a skylight fixture 10.
  • the sky-resembling assembly 14 is expanded to illustrate an LED array, which includes a mixture of LEDs 59 of different colors. While those skilled in the art will recognize various color combinations, the following example employs white LEDs 59 that emit white light at a first wavelength, bluish LEDs 59 that emit bluish light at a second wavelength, and greenish LEDs 59 that emit greenish light at a third wavelength.
  • the LED array may be divided into multiple strings of series-connected LEDs 59.
  • LED string LS1 includes the white LEDs 59 and forms a first group of LEDs.
  • LED string LS2 includes the bluish LEDs 59 and forms a second group of LEDs.
  • LED string LS3 includes the greenish LEDs 59 and forms a third group of LEDs.
  • the electronics module 18 controls the drive currents i 1 , i 2 , and i 3 , which are used to drive the respective LED strings LS1, LS2, and LS3 of the sky-resembling assembly 14.
  • the sun-resembling assemblies 16 may be similarly configured and driven by the same or different electronics modules 18 in similar fashion.
  • the ratio of drive currents i 1 , i 2 , and i 3 that are provided through respective LED strings LS1, LS2, and LS3 may be adjusted to effectively control the relative intensities of the white light emitted from the white LEDs 59 of LED string LS1, the bluish light emitted from the bluish LEDs 59 of LED string LS2, and the greenish light emitted from the green LEDs 59 of LED string LS3.
  • the resultant light from each LED string LS1, LS2, and LS3 mixes to generate an overall light output that has a desired color, correlated color temperature (CCT), and intensity, the latter of which may also be referred to as dimming level.
  • CCT correlated color temperature
  • the overall light output may take on any desired color or CCT.
  • the overall light output of the sky-resembling assembly 14 may range from a deep blue of an evening sky, to a medium blue of a daytime sky, to white light that falls on or within a desired proximity of the Black Body Locus (BBL) and has a desired CCT.
  • BBL Black Body Locus
  • the sun-resembling assemblies 16 are controlled in the same fashion to emulate direct and reflected sunlight as well as any of the other colors and CCTs described above for effects ranging from decorative to physiological.
  • the number of LED strings LSx may vary from one to many and different combinations of LED colors may be used in the different strings.
  • Each LED string LSx may have LEDs of the same color, variations of the same color, or substantially different colors.
  • each LED string LS1, LS2, and LS3 is configured such that all of the LEDs 59 that are in the string are all essentially identical in color.
  • the LEDs 59 in each string may vary substantially in color or be completely different colors in certain embodiments.
  • a single string embodiment is also envisioned, wherein currents may be individually adjusted for the LEDs of the different colors using bypass circuits or the like.
  • the electronics module 18 includes AC-DC conversion circuitry 61, control circuitry 60, a communication interface (I/F) 62, and a number of current sources, such as the illustrated DC-DC converters 64.
  • the AC-DC conversion circuitry 61 is configured to receive an AC signal (AC), rectify the AC signal, correct the power factor of the AC signal, and provide a DC power signal (PWR).
  • the DC power signal may be used to directly or indirectly power the control circuitry 60 and any other circuitry provided in the electronics module 18, including the DC-DC converters 64 and the communication interface 62.
  • the three respective DC-DC converters 64 of the electronics module 18 provide drive currents i 1 , i 2 , and i 3 for the three LED strings LS1, LS2, and LS3 of the sky-resembling assembly 14 in response to control signals CS1, CS2, and CS3.
  • additional drive circuitry may be provided for each of the sun-resembling assemblies 16 in similar fashion.
  • the drive currents i 1 , i 2 , and i 3 may be pulse width modulated (PWM) signals or variable DC signals.
  • the control signals CS1, CS2, and CS3 may be PWM signals that effectively turn the respective DC-DC converters 64 on during a logic high state and off during a logic low state of each period of the PWM signal.
  • the drive currents i 1 , i 2 , and i 3 for the three LED strings LS1, LS2, and LS3 may also be PWM signals.
  • the intensity of light emitted from each of the three LED strings LS1, LS2, and LS3 will vary based on the duty cycle of the respective PWM signals.
  • the control circuitry 60 will adjust the duty cycle of the drive currents i 1 , i 2 , and i 3 provided to each of the LED strings LS1, LS2, and LS3 to effectively adjust the intensity of the resultant light emitted from the LED strings LS1, LS2, and LS3 while maintaining the desired intensity, color and/or CCT based on instructions from the control circuitry 60. If the drive currents i 1 , i 2 , and i 3 for the three LED strings LS1, LS2, and LS3 are variable DC currents, the control circuitry 60 generates control signals CS1, CS2, and CS3 that result in the DC-DC converters 64 outputting the drive currents i 1 , i 2 , and i 3 at the appropriate DC levels.
  • the control circuitry 60 may include a central processing unit (CPU) 66, such as microprocessor or microcontroller, and sufficient memory 68 to store the requisite data and software instructions to enable the control circuitry 60 to function as described herein.
  • the control circuitry 60 may interact with the communication interface 62 to facilitate wired or wireless communications with other skylight fixtures 10 or remote devices, as described above.
  • control system or “control circuitry”
  • the term should be construed broadly to include the hardware and any additional software or firmware that is needed to provide the stated functionality. These terms should not be construed as only software, as electronics are needed to implement control systems described herein.
  • a control system may, but does not necessarily, include the control circuitry 60, the DC-DC converters 64, the AC-DC conversion circuitry 58, and the like.
  • CCT correlated color temperature
  • Light can be referred to as having a correlated color temperature even if the color point of the light is on the blackbody locus (i.e., its correlated color temperature would be equal to its color temperature); that is, reference herein to light as having a correlated color temperature does not exclude light having a color point on the blackbody locus.
  • Light engine or “light source” can be any structure (or combination of structures) from which light exits.
  • a light engine consists of one or more light sources plus one or more mechanical elements, one or more optical elements and/or one or more electrical elements.
  • a light engine is a component of a light fixture, i.e., it is not a complete light fixture, but it can be a discrete group or set of LEDs that is spatially segregated and controlled as a unit.
  • a light engine in a light fixture can be a discrete set of LEDs (e.g., an array of LEDs) mounted to a board (e.g., a printed circuit board) that is separate from one or more other light engines in the light fixture.
  • a larger board can comprise different sets or groups of LEDs occupying different portions of the board, and thereby comprise multiple light engines.
  • a light engine can, for example, comprise chip-on-board, packaged LEDs, secondary optics and/or control/drive circuitry.
  • a light fixture can comprise a first light engine comprising multiple LEDs on a first board, and a second light engine comprising multiple LEDs on a second board.
  • a light engine can comprise multiple LEDs spaced from each other (in the aggregate) in one dimension, in two dimensions or in three dimensions.
  • a first light engine can be mounted adjacent to or spaced laterally from but on the same plane with a second light engine and thereby spaced in one dimension.
  • a first light engine can be positioned adjacent to or spaced from a second light engine but positioned at an angle or on a second plane from the second light engine and thereby in two dimensions.
  • a first light engine can be offset from a second light engine in two or three dimensions.
  • a first light engine can be offset or positioned relative to two, three or more dimensions of one or more other light engines.
  • a light engine can comprise a single light source (e.g., a single LED), or an array of light sources (e.g., a plurality of LEDs, a plurality of other light sources, or a combination of one or more LEDs and/or one or more other light sources).
  • a single light source e.g., a single LED
  • an array of light sources e.g., a plurality of LEDs, a plurality of other light sources, or a combination of one or more LEDs and/or one or more other light sources.
  • a plurality of light sources can be on a board and controlled together, for example, a control device (that controls the color point of a mixture of light from the plurality of light sources, and/or that controls brightness of light emitted from one or more of the plurality of light sources, etc.) can control a plurality of light sources on a board (and/or can control all of the light sources on a board).
  • a control device that controls the color point of a mixture of light from the plurality of light sources, and/or that controls brightness of light emitted from one or more of the plurality of light sources, etc.
  • light exit region means any region through which light passes (e.g., as it travels from a space which is to one side of the light exit region to the other side of the light exit region, i.e., as it exits the space through the light exit region).
  • light exit region means any region through which light passes (e.g., as it travels from a space which is to one side of the light exit region to the other side of the light exit region, i.e., as it exits the space through the light exit region).
  • a light fixture has a cylindrical surface that defines an internal space (closed at the top and open at the bottom)
  • light can exit the space by traveling through the circular light exit region at the bottom of the cylindrical surface (i.e., such circular light exit region is defined by the lower edge of the cylindrical surface).
  • Such a light exit region can be open, or it can be partially or completely occupied by a structure that is at least partially light-transmitting (e.g., transparent or translucent).
  • a light exit region can be an opening in an opaque structure (through which light can exit), a light exit region can be a transparent region in an otherwise opaque structure, a light exit region can be an opening in an opaque structure that is covered by a lens or a diffuser, etc.
  • the color of visible light emitted by a light source, and/or the color of a mixture visible light emitted by a plurality of light sources can be represented on either the 1931 CIE (Commission International de I'Eclairage) Chromaticity Diagram or the 1976 CIE Chromaticity Diagram. Persons of skill in the art are familiar with these diagrams, and these diagrams are readily available.
  • 1931 CIE Commission International de I'Eclairage
  • the CIE Chromaticity Diagrams map out the human color perception in terms of two CIE parameters, namely, x (or ccx) and y (or ccy) (in the case of the 1931 diagram) or u' and v' (in the case of the 1976 diagram). Each color point on the respective diagrams corresponds to a particular hue.
  • CIE chromaticity diagrams see, for example, " Encyclopedia of Physical Science and Technology", vol. 7, 230-231 (Robert A Meyers ed., 1987 ).
  • the spectral colors are distributed around the boundary of the outlined space, which includes all of the hues perceived by the human eye. The boundary represents maximum saturation for the spectral colors.
  • the 1931 CIE Chromaticity Diagram can be used to define colors as weighted sums of different hues.
  • the 1976 CIE Chromaticity Diagram is similar to the 1931 Diagram, except that similar distances on the 1976 Diagram represent similar perceived differences in color.
  • hue means light that has a color shade and saturation that correspond to a specific point on a CIE Chromaticity Diagram, i.e., a color point that can be characterized with x, y coordinates on the 1931 CIE Chromaticity Diagram or with u', v' coordinates on the 1976 CIE Chromaticity Diagram.
  • deviation from a color point on the diagram can be expressed either in terms of the x, y coordinates or, alternatively, in order to give an indication as to the extent of the perceived difference in color, in terms of MacAdam ellipses (or plural-step MacAdam ellipses).
  • a locus of color points defined as being ten MacAdam ellipses (also known as "a ten-step MacAdam ellipse) from a specified hue defined by a particular set of coordinates on the 1931 CIE Chromaticity Diagram consists of hues that would each be perceived as differing from the specified hue to a common extent (and likewise for loci of points defined as being spaced from a particular hue by other quantities of MacAdam ellipses).
  • a typical human eye is able to differentiate between hues that are spaced from each other by more than seven MacAdam ellipses (and is not able to differentiate between hues that are spaced from each other by seven or fewer MacAdam ellipses).
  • the blackbody locus A series of points that is commonly represented on the CIE Diagrams is referred to as the blackbody locus.
  • the 1976 CIE Diagram includes temperature listings along the blackbody locus. These temperature listings show the color path of a blackbody radiator that is caused to increase to such temperatures. As a heated object becomes incandescent, it first glows reddish, then yellowish, then white, and finally bluish. This occurs because the wavelength associated with the peak radiation of the blackbody radiator becomes progressively shorter with increased temperature, consistent with the Wien Displacement Law. Illuminants that produce light that is on or near the blackbody locus can thus be described in terms of their color
  • dominant wavelength is used herein according to its well-known and accepted meaning to refer to the perceived color of a spectrum, i.e., the single wavelength of light which produces a color sensation most similar to the color sensation perceived from viewing light emitted by the light source, as opposed to "peak wavelength", which is well known to refer to the spectral line with the greatest power in the spectral power distribution of the light source.
  • the human eye does not perceive all wavelengths equally (it perceives yellow and green better than red and blue), and because the light emitted by many solid state light emitters (e.g., light emitting diodes) is actually a range of wavelengths, the color perceived (i.e., the dominant wavelength) is not necessarily equal to (and often differs from) the wavelength with the highest power (peak wavelength).
  • a truly monochromatic light such as a laser has a dominant wavelength that is the same as its peak wavelength.
  • first light engine e.g., comprising a light emitting diode and phosphor
  • first color point a first color point
  • CIE Chromaticity Diagram plots the color point of the light exiting from the first light engine (i.e., a first color point) on a CIE Chromaticity Diagram
  • desired range of color points or a single desired color point
  • Each line segment drawn in this way will have one end at the first color point, will pass through the range for the desired mixed light color point (or the desired single color point), and will have its other end at a second color point.
  • a second light engine can be provided from which light of the second color point exits, and when the first light engine and the second light engine are energized so that light exits from them, the color point of the mixed light will necessarily lie along a line segment connecting the first color point and the second color point, and the location of the color point of the mixed light along the line segment will be dictated by (namely, proportional to) the relative brightness of the respective light that exits from the first and second light engines.
  • the ratio of (1) the distance from the first color point to the color point of the mixed light, divided by (2) the distance from the first color point to the second color point will be equal to the ratio of the brightness (in lumens) of the first light engine divided by the brightness (in lumens) of the combination of light in the mixed light.
  • the desired mixed light color point can be obtained by calculating the relative brightness of the first and second light sources (or light engines) necessary to arrive at the desired mixed light color point.
  • the geometrical relationships can be used to ensure that the desired mixed light color point is obtained (e.g., conceptually, the color point of a sub-mixture of light from the first light source (or the first light engine) and the second light source (or the second light engine) can be determined, and then the color point of a mixture or sub-mixture (having a brightness of the combined brightness of the first light source (or the first light engine) and the second light source (or the second light engine) and the third light source (or the third light engine) can be determined, and the range of mixed light color points that can be reached is defined by the perimeter obtained from drawing lines connecting the respective color points of the light sources (and/or light engines).

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Claims (13)

  1. Appareil de puits de lumière comprenant :
    un ensemble ressemblant au ciel (14) comprenant un ensemble optique ressemblant au ciel (24, 32, 42, 52) et une source de lumière spécifique au ciel (24, 34, 44, 54) dans lequel la lumière provenant de la source de lumière spécifique au ciel sort d'une surface intérieure plane de l'ensemble optique ressemblant au ciel en tant que lumière de puits de lumière ;
    une pluralité d'ensembles ressemblant au soleil (16) qui sont agencés les uns à côté des autres et s'étendent vers le bas depuis une périphérie de l'ensemble ressemblant au ciel, chacun de la pluralité d'ensembles ressemblant au soleil comprenant un ensemble optique ressemblant au soleil (24, 32, 42, 52) et une source de lumière spécifique au soleil (24, 34, 44, 54), dans lequel la lumière provenant de la source de lumière spécifique au soleil sort d'une surface intérieure plane de l'ensemble optique ressemblant au soleil en tant que lumière du soleil, dans lequel les surfaces intérieures planes de l'ensemble optique ressemblant au ciel et de la pluralité d'ensembles optiques ressemblant au soleil définissent une cavité ; et
    au moins un module de commande (18) configuré pour, dans un premier mode, piloter la source de lumière spécifique au ciel et chaque source de lumière spécifique au soleil de sorte que la lumière du puits de lumière ait un premier point de couleur et la lumière du soleil d'au moins l'un de la pluralité d'ensembles ressemblant au soleil ait un deuxième point de couleur qui est différent du premier point de couleur ; et dans lequel
    l'ensemble ressemblant au ciel imite une fenêtre d'un puits de lumière traditionnel et chacun de la pluralité d'ensembles ressemblant au soleil imite la lumière du soleil traversant et se réfléchissant sur les parois latérales du puits de lumière traditionnel ; caractérisé en ce qu'un angle intérieur (α) formé entre la surface intérieure plane de l'ensemble optique ressemblant au ciel (14) et la surface intérieure plane de chacun des ensembles optiques ressemblant au soleil (24, 32, 42, 52) est un angle obtus, dans lequel
    l'angle intérieur est supérieur à 90 degrés et inférieur ou égal à 135 degrés.
  2. Appareil de puits de lumière de la revendication 1, dans lequel l'angle intérieur est supérieur ou égal à 95 degrés et inférieur ou égal à 130 degrés.
  3. Appareil de puits de lumière de la revendication 1, dans lequel l'angle intérieur est supérieur ou égal à 100 degrés et inférieur ou égal à 125 degrés.
  4. Appareil de puits de lumière de la revendication 1, dans lequel :
    une valeur de coordonnée x du premier point de couleur et une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931 diffèrent d'au moins 0,1 ; et
    le premier point de couleur se situe dans un premier espace colorimétrique défini par les coordonnées x, y sur le diagramme de chromaticité CIE 1931 : (0,37, 0,34), (0,35, 0,38), (0,15, 0,20) et (0,20, 0,14) ; et
    le deuxième point de couleur se situe dans un deuxième espace colorimétrique défini par les coordonnées x, y sur le diagramme de chromaticité CIE 1931: (0,29, 0,32), (0,32, 0,29), (0,41, 0,36), (0,48, 0,39), (0,48, 0,43), (0,40, 0,41) et (0,35, 0,38) .
  5. Appareil de puits de lumière de la revendication 1, dans lequel :
    une valeur de coordonnée x du premier point de couleur et une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931 diffèrent d'au moins 0,1 ; et
    le premier point de couleur se situe dans un premier espace colorimétrique défini par les coordonnées x, y sur le diagramme de chromaticité CIE 1931: (0,32, 0,31), (0,30, 0,33), (0,15, 0,17) et (0,17, 0,14) ; et
    le deuxième point de couleur se situe dans un deuxième espace colorimétrique défini par les coordonnées x, y sur le diagramme de chromaticité CIE 1931: (0,30, 0,34), (0,30, 0,30), (0,39, 0,36), (0,45, 0,39), (0,47, 0,43), (0,40, 0,41) et (0,35, 0,38).
  6. Appareil de puits de lumière de la revendication 1, dans lequel :
    une valeur de coordonnée x du premier point de couleur et une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931 diffèrent d'au moins 0,1 ; et
    le premier point de couleur se situe dans un premier espace colorimétrique défini par les coordonnées x, y sur le diagramme de chromaticité CIE 1931: (0,39, 0,31), (0,34, 0,40), (0,10, 0,20) et (0,16, 0,06) ; et
    le deuxième point de couleur se situe dans un deuxième espace colorimétrique défini par les coordonnées x, y sur le diagramme de chromaticité CIE 1931: (0,28, 0,36), (0,35, 0,26), (0,44, 0,33), (0,62, 0,34), (0,50, 0, 46), (0,43, 0,45), (0,36, 0,43) .
  7. Appareil de puits de lumière de la revendication 1, dans lequel :
    une valeur de coordonnée x du premier point de couleur et une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931 diffèrent d'au moins 0,1 ; et
    le premier point de couleur se situe dans un premier espace colorimétrique défini par les coordonnées x, y sur le diagramme de chromaticité CIE 1931: (0,10, 0,20), (0, 36, 0,43), (0,43, 0,45), (0,50, 0,46), (0,62, 0,34), (0,44, 0, 33), (0,16, 0,06) ; et
    le deuxième point de couleur se situe dans un deuxième espace colorimétrique défini par les coordonnées x, y sur le diagramme de chromaticité CIE 1931: (0,10, 0,20), (0,36, 0,43), (0,43, 0,45), (0,50, 0,46), (0,62, 0, 34), (0,44, 0,33), (0,16, 0,06).
  8. Appareil de puits de lumière de la revendication 1, dans lequel une valeur de coordonnée x du premier point de couleur et une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931 diffèrent d'au moins 0,15.
  9. Appareil de puits de lumière de la revendication 1, dans lequel une valeur de coordonnée x du premier point de couleur et une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931 diffèrent d'au moins 0,2.
  10. Appareil de puits de lumière de la revendication 1, dans lequel une valeur de coordonnée x du premier point de couleur est inférieure à une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931.
  11. Appareil de puits de lumière de la revendication 1, dans lequel une valeur de coordonnée y du premier point de couleur est inférieure à une valeur de coordonnée y du deuxième point de couleur sur un diagramme de chromaticité CIE 1931.
  12. Appareil de puits de lumière de la revendication 1, dans lequel :
    une valeur de coordonnée x du premier point de couleur est inférieure à une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931 ; et
    la valeur de coordonnée y du premier point de couleur est inférieure à la valeur de coordonnée y du deuxième point de couleur sur le diagramme de chromaticité CIE 1931.
  13. Appareil de puits de lumière de la revendication 12, dans lequel une valeur de coordonnée x du premier point de couleur et une valeur de coordonnée x du deuxième point de couleur sur un diagramme de chromaticité CIE 1931 diffèrent d'au moins 0,15.
EP19705900.9A 2018-02-08 2019-02-05 Appareil de puits de lumière Active EP3749894B1 (fr)

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US201862628131P 2018-02-08 2018-02-08
US15/972,176 US10465869B2 (en) 2017-01-30 2018-05-06 Skylight fixture
US15/972,178 US10451229B2 (en) 2017-01-30 2018-05-06 Skylight fixture
PCT/US2019/016592 WO2019156950A1 (fr) 2018-02-08 2019-02-05 Appareil de puits de lumière

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US20180216791A1 (en) * 2017-01-30 2018-08-02 Cree, Inc. Light fixtures and methods

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CA3089271C (fr) 2023-02-14
CA3089271A1 (fr) 2019-08-15

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