JP2022191696A - Lighting apparatus - Google Patents

Abstract

To provide a lighting apparatus capable of suppressing deterioration of sky reproducibility even when used for a long time.SOLUTION: A lighting apparatus includes a blue LED module having a white LED, a blue LED, and a green LED, a light guide plate that diffuses the light of the blue LED module and emits surface light, and a control device that controls the blue LED module to reproduce the color of the sky, and the control unit is configured to individually correct the outputs to the white, blue, and green LEDs on the basis of deterioration information and a usage time of the light guide plate.SELECTED DRAWING: Figure 12

Description

The present disclosure relates to lighting fixtures that include LEDs (Light Emitting Diodes).

2. Description of the Related Art Conventionally, lighting fixtures capable of reproducing the appearance of the sky have been proposed. For example, in the lighting fixture described in Patent Document 1, a light-emitting module having LEDs of multiple colors is used to control the emission of blue light, yellow light, orange light, red light, and white light, thereby changing the appearance of the sky. It is configured to reproduce.

JP 2019-102166 A

The lighting fixture described in Patent Document 1 controls emission of blue light, yellow light, orange light, red light, and white light, and projects a natural sky such as a blue sky, a cloudy sky, or an evening sky on the light diffusion plate. It's becoming Here, when the lighting equipment is used for a long time, the light diffusion plate deteriorates due to the temperature load and the like, and the sky reproducibility of the lighting equipment deteriorates.

An object of the present disclosure is to solve the above-described problems, and to provide a lighting fixture that can suppress deterioration in the reproducibility of the sky even when used for a long period of time.

A lighting fixture according to the present disclosure includes a blue LED module having a white LED, a blue LED, and a green LED, a light guide plate that diffuses the light of the blue LED module and emits surface light, and a blue LED module. a controller for controlling and reproducing the color of the sky, the controller individually correcting the output to the white LED, the blue LED, and the green LED based on the deterioration information and the usage time of the light guide plate. .

According to the lighting fixture according to the present disclosure, by individually correcting the output to the white LED, the blue LED, and the green LED based on the deterioration information and the usage time of the light guide plate, even when used for a long time, the sky reproducibility can be suppressed.

1 is a perspective view showing an appearance of a lighting fixture according to Embodiment 1; FIG. 1 is an exploded perspective view showing the configuration of a lighting fixture according to Embodiment 1; FIG. 2 is an exploded perspective view showing the configuration of the light source unit of the lighting fixture according to Embodiment 1. FIG. 2 is an exploded perspective view showing the configuration of the light source unit of the lighting fixture according to Embodiment 1. FIG. 1 is a schematic cross-sectional view showing the configuration of a lighting fixture according to Embodiment 1; FIG. 1 is a diagram showing a schematic configuration of a blue LED module according to Embodiment 1; FIG. 3 is a control block diagram of the lighting fixture according to Embodiment 1. FIG. 4 is a graph showing the amount of light of the LED module for blue according to Embodiment 1. FIG. 5 is a graph showing aging deterioration data of the amount of light of a light guide plate; 5 is a graph showing aging deterioration data of chromaticity of a light guide plate; 5 is a graph showing aging deterioration data of chromaticity of a light guide plate; 4 is a flow chart showing the operation of the lighting fixture according to Embodiment 1. FIG. 9 is a flow chart showing the operation of the lighting fixture according to Embodiment 2; FIG. 10 is a diagram showing a first correction factor map created by a light control unit according to Embodiment 2; FIG. 10 is a diagram showing a second correction factor map created by a light control unit according to Embodiment 2; FIG. 10 is a diagram showing a third correction factor map created by a light control unit according to Embodiment 2; 10 is a flow chart showing the operation of the lighting fixture according to Embodiment 3. FIG.

Embodiments of a lighting fixture will be described below with reference to the drawings. The lighting fixture of the present disclosure is not limited to the following embodiments, and can be modified in various ways. In addition, the lighting fixture of the present disclosure includes all possible combinations of the configurations shown in the following embodiments. Also, in each figure, the same reference numerals denote the same or corresponding parts, which are common throughout the specification. In addition, throughout the specification, the vertical direction from the floor surface to the ceiling is called "upward direction", and the ceiling side is called "upper side". Similarly, the vertical direction from the ceiling to the floor will be called "downward", and the floor side will be called "lower". In each drawing, the relative dimensional relationship, shape, etc. of each component may differ from the actual one.

Embodiment 1.
FIG. 1 is a perspective view showing the appearance of a lighting fixture 1 according to Embodiment 1. FIG. The lighting fixture 1 is a ceiling-embedded lighting fixture, and includes a fixture body 50 embedded in the ceiling and a light source unit 10 attached to the fixture body 50 . The light source unit 10 includes a diffusion cover 13 that emits white light and a light guide plate 17 that emits blue light. The lighting fixture 1 can provide illumination with a visual effect of depth, such as looking at the sky through a window frame, by blue light from the light guide plate 17 and white light from the diffusion cover 13 .

FIG. 2 is an exploded perspective view showing the configuration of the lighting fixture 1 according to Embodiment 1. FIG. The luminaire 1 is embedded in an embedded hole H provided in the ceiling C and installed. As shown in FIG. 2, the fixture main body 50 of the lighting fixture 1 is formed in a rectangular box shape and has an open bottom. The instrument body 50 has a main surface 51 and four side surfaces 52 . Each of the side surfaces 52 is provided so as to vertically extend downward from each of the four sides of the main surface 51 .

V-spring fittings 53 are attached to the inner surfaces of the two opposing side surfaces 52 of the four side surfaces 52 of the instrument body 50 . The V-spring mounting bracket 53 hooks and holds a V-spring 12, which is provided in the light source unit 10 and will be described later. Further, bolt holes 51-1 are provided at the four corners of the main surface 51. As shown in FIG. A suspension bolt B is suspended from an embedded hole H in the ceiling C. The apparatus main body 50 is fixed to the ceiling C by inserting the suspension bolt B into the bolt hole 51-1 and then tightening the suspension bolt B with the nut 61. As shown in FIG.

A wire hole 51-2 is formed in the main surface 51, and a terminal block 54 is provided. The terminal block 54 has a power terminal block and a signal line terminal block. In FIG. 2, the power supply terminal block and the signal line terminal block are omitted. An electric wire and a signal wire are drawn out from the electric wire hole 51-2. The electric wire pulled out from the electric wire hole 51-2 is electrically connected to the power supply terminal block of the terminal block 54. As shown in FIG. Also, the signal line drawn out from the wire hole 51-2 is electrically connected to the signal line terminal block of the terminal block 54. As shown in FIG.

The light source unit 10 is arranged inside the opening of the fixture body 50 . The light source unit 10 includes an upper cover 27 , a flange portion 11 , a V spring 12 , a diffusion cover 13 and a light guide plate 17 . The upper cover 27 is formed in the shape of a truncated pyramid with an open lower end. Each of the four side surfaces of the upper cover 27 is formed in a trapezoidal shape, and the length of the upper side is shorter than the length of the lower side. The flange portion 11 is formed in a rectangular frame shape in plan view. As shown in FIG. 2, the flange portion 11 is arranged to protrude outward in the horizontal direction from the lower end of the upper cover 27 .

The V spring 12 is a wire spring formed by bending a metal wire into a V shape, and is attached to the upper surface of the flange portion 11 . A total of four V-springs 12 are provided in accordance with the positions of the V-spring fittings 53 of the instrument body 50 . By engaging the V spring 12 with the V spring fitting 53 , the light source unit 10 is suspended and held by the fixture body 50 . In addition, when the lighting fixture 1 is attached to the embedded hole H of the ceiling C, the flange portion 11 covers the edge of the embedded hole H. As shown in FIG. Therefore, when the luminaire 1 is attached to the embedded hole H of the ceiling C, the embedded hole H is invisible to the user.

3 and 4 are exploded perspective views showing the configuration of the light source unit 10 of the lighting fixture 1 according to Embodiment 1. FIG. The light source unit 10 consists of the components shown in FIG. 3 and the components shown in FIG. 3 shows components provided in the lower portion of the light source unit 10, and FIG. 4 shows components provided in the upper portion of the light source unit 10. FIG.

Among the constituent elements of the light source unit 10, first, the constituent elements shown in FIG. 3 will be described. As shown in FIG. 3 , light source unit 10 includes flange portion 11 , V spring 12 , packing 21 , diffusion cover 13 , packing 22 , white LED module 14 , and module holding portion 15 .

The flange portion 11 is formed in a rectangular frame shape as described above. The flange portion 11 is made of metal, for example. A total of four V springs 12 are provided on the upper surface of the flange portion 11 .

The module holding portion 15 is formed in a rectangular frame shape in plan view. The module holding portion 15 is configured by combining four members. Each of the four members has an L-shaped cross section as shown in FIG. 5, which will be described later. Further, as shown in FIG. 3, mounting flanges 15-1 are provided at the lower ends of the four members of the module holding portion 15, respectively. The mounting flange 15-1 is attached to the flange portion 11 by screws.

The white LED module 14 has three substrates 140 and two types of white LEDs 141 and 142 with different color temperatures provided inside each of the three substrates 140 . The three substrates 140 of the white LED module 14 are arranged in a U shape in plan view so as to form three sides of a rectangle. The angle between adjacent substrates 140 is 90°. The white LED module 14 emits white light from three directions forming a U-shape.

The white LED 141 is, for example, a daylight LED with a color temperature of 4000 to 5000 (K), and the white LED 142 is, for example, an incandescent LED with a color temperature of 2600 to 3000 (K). The white LED module 14 can emit white light with various color temperatures and various amounts of light by changing the dimming rate of the white LEDs 141 and 142 . Moreover, the white LED 141 and the white LED 142 may be dimmed according to time. For example, the white LED 141 and the white LED 142 are dimmed so that the amount of light is 100% during the day, 50% at dawn and dusk, and 20% at night. Further, the white LED 141 and the white LED 142 are dimmed so that, for example, the color temperature is daytime white with a color temperature of 4500K, the color temperature is light bulb color with a color temperature of 3000 to 3500K in the evening, and the color temperature is 4000 to 3800K at night. .

A light-emitting element or a light-emitting device other than an LED may be used as the light source of the white LED module 14 . Also, the white LED module 14 may include only one type of white LED, or may include three or more types of white LEDs. The white LED module 14 is arranged inside the module holding portion 15 and held by the module holding portion 15 .

The packing 22 is formed in a rectangular thin frame shape in a plan view. The packing 22 is arranged between the upper end surface of the diffusion cover 13 and the lower surface, which is the emission surface of the light guide plate 17 shown in FIG. The packing 22 blocks the light emitted from the blue LED module 18 to be described later so as not to enter the upper end surface of the diffusion cover 13 from the emission surface of the light guide plate 17 . In addition, the packing 22 blocks the white light emitted from the white LED module 14 so as not to enter the emission surface of the light guide plate 17 from the upper end surface of the diffusion cover 13 . Furthermore, the packing 22 also functions as a cushioning material when the lighting fixture 1 shakes due to an earthquake or the like.

The diffusion cover 13 is made of, for example, white resin, and has a rectangular frame shape in a plan view. The diffusion cover 13 has a truncated quadrangular pyramid shape with upper and lower openings. That is, each of the four side surfaces of the diffusion cover 13 is inclined at a preset angle with respect to the vertical direction. Each of the four side surfaces of the diffusion cover 13 is composed of a trapezoidal diffusion plate, and the length of the upper side is shorter than the length of the lower side. In addition, since each of the four side surfaces of the diffusion cover 13 is inclined, the upper side is positioned inside the lower side in plan view. As a result, the internal space of the diffusion cover 13 is tapered downward. The diffusion cover 13 may be formed by combining four trapezoidal diffusion plates, or may be integrally formed.

Of the four side surfaces of the diffusion cover 13, three surfaces are light emitting surfaces 13-1 and the other surface is a non-light emitting surface 13-2. The three light emitting surfaces 13-1 are arranged in a U-shape. Here, in each of the four side surfaces of the diffusion cover 13, the inner surface facing the internal space of the diffusion cover 13 is called the front surface, and the outer surface is called the rear surface.

The diffusion cover 13 is arranged inside the white LED module 14 . That is, the white LED modules 14 are arranged on the rear side of each of the light emitting surfaces 13-1 of the diffusion cover 13. As shown in FIG. The white light emitted from the white LED module 14 enters from the rear surface of the light emitting surface 13-1 of the diffusion cover 13, passes through the light emitting surface 13-1, and is emitted from the front surface of the light emitting surface 13-1. Since each of the light emitting surfaces 13-1 is inclined, the white light emitted from the front surfaces of the three light emitting surfaces 13-1 illuminates obliquely downward.

A light-shielding sheet (not shown) is attached to the rear surface of the non-light-emitting surface 13-2 of the diffusion cover 13 to prevent light from leaking from the non-light-emitting surface 13-2.

In this way, the diffusion cover 13 has a structure in which three light-emitting surfaces 13-1 that emit white light and one non-light-emitting surface 13-2 that does not emit light are combined. As a result, the light emitted from the diffusion cover 13 is light from three directions, giving a sense of depth as if light from the outside is coming in through a window frame in the sunshine illuminated by sunlight or a window frame in the shade. A certain visual effect can be produced.

The diffusion cover 13 is placed on the flange portion 11 via the packing 21 . The packing 21 is formed in a rectangular thin frame shape in plan view. The packing 21 prevents direct contact with each other when the flange portion 11 or the diffusion cover 13 vibrates. In addition, the elasticity of the packing 21 reduces the force applied from the flange portion 11 to the diffusion cover 13 , and damage to the diffusion cover 13 can be suppressed. Furthermore, by providing the packing 21 between the flange portion 11 and the diffusion cover 13, it is possible to give an impression of a window frame. In particular, when the packing 21 has a white color tone, the impression of the window frame can be enhanced. The packing 21 also functions as a light shielding portion that prevents white light from leaking through the gap between the diffusion cover 13 and the flange portion 11 .

Next, among the constituent elements of the light source unit 10, the constituent elements shown in FIG. 4 will be described. As shown in FIG. 4, the light source unit 10 further includes a lower guide plate 16, a light guide plate 17, a blue LED module 18, an upper guide plate 19, an insulating portion 23, a module holding portion 24, and a fixing portion. A member 25 , a light guide plate cover 26 and an upper cover 27 are provided. The light source unit 10 further includes a control section 30 arranged on the upper surface of the upper cover 27 to control the light source unit 10 . The control section 30 has a power supply device 31 and a light control unit 32 .

The lower guide plate 16 is placed on the module holding portion 15 shown in FIG. The lower guide plate 16 is composed of two rod-shaped members, and is arranged below the light guide plate 17 along the ends extending in the longitudinal direction of the light guide plate 17 . At both ends of the two rod-like members forming the lower guide plate 16, projections 16-3 are provided. The protrusion 16-3 extends vertically upward. The protrusion 16-3 comes into contact with an end face 17-2 extending in the lateral direction of the light guide plate 17, and restricts movement of the light guide plate 17 in the longitudinal direction.

The upper guide plate 19 is placed on the light guide plate 17 . The upper guide plate 19 is composed of two rod-shaped members and arranged along the longitudinally extending end of the light guide plate 17 .

The light guide plate 17 is formed in a rectangular plate shape in plan view. The light guide plate 17 diffuses the light emitted from the LED module 18 for blue, and emits blue light from the lower surface, which is the emission surface. The light guide plate 17 is made of acrylic resin and contains, for example, silica as a scatterer that is a particle that scatters light. Longitudinal ends of the light guide plate 17 are vertically sandwiched between the lower guide plate 16 and the upper guide plate 19 .

The upper surface of the light guide plate 17 is smooth for total reflection. The upper surface of the light guide plate 17 is desirably mirror-finished. If the top surface of the light guide plate 17 is scratched during the assembly work of the lighting device 1, total reflection is less likely to occur at the scratched portion. Therefore, a portion of the lower surface corresponding to the scratched portion of the upper surface appears whitish. Therefore, in order to prevent the top surface of the light guide plate 17 from being damaged, the top surface of the light guide plate 17 may be covered with a reflective sheet (not shown).

The blue LED module 18 is arranged parallel to the end surface 17-1 of the light guide plate 17 extending in the longitudinal direction. The blue LED module 18 includes two substrates 180 and a plurality of LEDs arranged on each substrate 180 . A plurality of through holes 18-1 are provided in the upper portion of the substrate 180. As shown in FIG. The configuration and dimming control of the blue LED module 18 will be detailed later.

The blue LED module 18 is attached to the module holding portion 24 with a fixing member 25 . A cylindrical protrusion 25-1 is provided on the surface of the fixing member 25 on the blue LED module 18 side. The protrusions 25-1 are inserted into the through holes 18-1 of the substrate 180 of the LED module 18 for blue. The fixing member 25 is screwed to the module holding portion 24 while the protrusion 25-1 is inserted into the through hole 18-1.

The module holding portion 24 is formed of sheet metal having an L-shaped cross section. The module holding portion 24 not only holds the substrate 180 of the LED module 18 for blue, but also functions as a radiator plate that releases heat from the LED module 18 for blue to the outside. The module holding portion 24 is attached to the upper surface of the module holding portion 15 shown in FIG. Also, the blue LED module 18 is attached to the module holding portion 24 via the insulating portion 23 . If the substrate 180 of the blue LED module 18 is not a double-sided substrate, the insulating portion 23 may be omitted.

The light guide plate cover 26 is placed on the upper guide plate 19 . The light guide plate cover 26 covers the light guide plate 17 from above and protects the light guide plate 17 . The upper cover 27 covers and protects the components of the light source unit 10 shown in FIGS. 3 and 4 . A control unit 30 is mounted on the upper surface of the upper cover 27 . The control section 30 is composed of a power supply device 31 and a light control unit 32 .

The power supply device 31 supplies power to the blue LED module 18 and the white LED module 14 . The dimming unit 32 dims each LED provided in the blue LED module 18 and the white LED module 14 . The power supply device 31 and the light control unit 32 are electrically connected by wiring such as transition wiring. In addition, the power supply device 31 and the light control unit 32 are electrically connected to the power terminal block and the signal terminal block of the terminal block 54 of the fixture body 50 when the light source unit 10 is attached to the fixture body 50 .

FIG. 5 is a schematic cross-sectional view showing the configuration of the lighting fixture 1 according to Embodiment 1. As shown in FIG. FIG. 5 schematically shows a cross section of the lighting device 1 taken along a plane parallel to one side surface in the short direction at the central portion in the longitudinal direction.

As shown in FIG. 5 , the light source unit 10 is arranged inside the opening at the lower end of the fixture body 50 . A V spring 12 is provided on the upper surface of the flange portion 11 of the light source unit 10 . The V-spring 12 is held in a state of being hooked on a V-spring fitting 53 provided on the instrument body 50 . As a result, the light source unit 10 and the fixture body 50 are engaged, and the light source unit 10 is held by the fixture body 50 .

The white LED module 14 is held by the module holding portion 15 and arranged on the rear surface of the diffusion cover 13 . Further, the blue LED module 18 is held by the module holding portion 24 fixed to the upper surface of the module holding portion 15, and arranged to face the end face 17-1 of the light guide plate 17 with the gap 33 interposed therebetween. The diffusion cover 13 and the light guide plate 17 are arranged in directions that cross each other. Specifically, the light guide plate 17 is arranged parallel to the ceiling C, and the diffusion cover 13 is arranged so as to extend obliquely downward from the light guide plate 17 .

The white light emitted from the white LED module 14 enters from the rear surface of the diffusion cover 13 and is emitted from the front surface of the light emitting surface 13-1 of the diffusion cover 13. FIG. Since the light emitting surface 13-1 is inclined, the white light emitted from the front surface of the light emitting surface 13-1 illuminates obliquely downward. The light emitted from the blue LED module 18 is incident on the end surface 17-1 of the light guide plate 17 and travels through the light guide plate 17 while being totally reflected by the upper and lower surfaces of the light guide plate 17. FIG. Part of the light that travels through the light guide plate 17 hits the scatterers in the light guide plate 17 and is diffused, and surface-emitted from the lower surface of the light guide plate 17 .

Next, the configuration and dimming control of the blue LED module 18 in this embodiment will be described. FIG. 6 is a diagram showing a schematic configuration of the blue LED module 18 according to Embodiment 1. As shown in FIG. FIG. 6 shows a schematic configuration of one substrate 180 in the LED module 18 for blue, and the configuration of the other substrate 180 is also the same as in FIG. As shown in FIG. 6 , a plurality of white LEDs 181 , blue LEDs 182 and green LEDs 183 are arranged on the substrate 180 of the blue LED module 18 . Specifically, on the substrate 180 , a plurality of sets of two white LEDs 181 , two blue LEDs 182 and one green LED 183 are arranged in a line.

The number and arrangement of white LEDs 181, blue LEDs 182, and green LEDs 183 arranged on substrate 180 of blue LED module 18 are not limited to the example in FIG. For example, white LED 181 , blue LED 182 , and green LED 183 may be arranged in the lower area of substrate 180 . In this case, the light guide plate 17 and the diffusion cover 13 can be arranged close to each other, and the blue light from the light guide plate 17 and the white light from the diffusion cover 13 can be emitted in close proximity. Alternatively, the white LED 181, the blue LED 182, and the green LED 183 may be arranged with their positions shifted in the vertical direction. The arrangement of the white LEDs 181, the blue LEDs 182, and the green LEDs 183 may be appropriately determined in consideration of color variation and board design. However, in order to reproduce the color of the sky, the ratio of the number of white LEDs 181, blue LEDs 182, and green LEDs 183 to the total number of LEDs in blue LED module 18 is preferably 2:2:1.

A plurality of through holes 18-1 are provided in the upper portion of the substrate 180 of the LED module 18 for blue. A through hole 18-1 (not shown) provided in the central portion of the substrate 180 is circular, and the other through holes 18-1 are elliptical extending in the longitudinal direction. The substrate 180 of the LED module 18 for blue thermally expands and contracts due to the heat emitted from the white LEDs 181 , the blue LEDs 182 and the green LEDs 183 . Therefore, when the blue LED module 18 is fixed to the module holding portion 24, the substrate 180 of the blue LED module 18 may be warped or distorted due to thermal expansion and contraction.

Therefore, in the present embodiment, an elliptical through hole 18-1 is provided in the substrate 180 so that the protrusion 25-1 of the fixing member 25 can be inserted into the through hole 18-1 with play. As a result, even when the substrate 180 of the blue LED module 18 thermally expands and contracts, the protrusion 25-1 can move in the longitudinal direction within the elliptical through hole 18-1. Warpage or distortion can be suppressed.

The white LED 181 is, for example, an LED with a color temperature of 5000 (K) and a forward voltage of 6V. The blue LED 182 is, for example, an LED with a dominant wavelength of 440 to 480 nm and a forward voltage of 3V. The green LED 183 is, for example, an LED with a dominant wavelength of 510 to 570 nm and a forward voltage of 3V. White LED 181 has a higher forward voltage than blue LED 182 and green LED 183 and emits brighter light than blue LED 182 and green LED 183 when the same current flows. That is, the output balance of each LED in the LED module 18 for blue becomes white LED181>blue LED182>green LED183.

Blue LED module 18 of the present embodiment controls the light emission of white LED 181, blue LED 182, and green LED 183 to reproduce the color of the sky, particularly blue sky. By using the three colors of white, blue, and green in this way, the color rendering can be improved compared to the case of using the three colors of red, blue, and green.

FIG. 7 is a control block diagram of the lighting fixture 1 according to Embodiment 1. As shown in FIG. As shown in FIG. 7, the power supply device 31 includes a first lighting circuit 31a and a second lighting circuit 31b that output currents to the white LED 181, the blue LED 182, and the green LED 183 of the blue LED module 18, respectively. and a third lighting circuit 31c. By providing a lighting circuit for each LED individually, it is possible to two-dimensionally control the emission color of the LED module 18 for blue, so that various blue skies can be reproduced. The power supply device 31 further includes a fourth lighting circuit 31d and a fifth lighting circuit 31e that output currents to the white LED 141 and the white LED 142 of the white LED module 14, respectively.

The power supply device 31 further includes a power control circuit 310 . The power control circuit 310 is composed of hardware such as a dedicated single circuit or multiple circuits, a microcomputer or processor executing a program stored in memory, or a combination thereof. The power supply control circuit 310 individually controls the outputs of the first lighting circuit 31a to the fifth lighting circuit 31e based on commands from the dimming unit 32. FIG. The power supply device 31 further includes a circuit (not shown) such as a rectifier circuit for converting commercial power to DC power.

The first lighting circuit 31a to the fifth lighting circuit 31e are supplied with power from a circuit such as a rectifier circuit included in the power supply device 31 . Further, the first lighting circuit 31a to the fifth lighting circuit 31e are provided with switching elements (not shown) for lighting each LED. The first lighting circuit 31a to the fifth lighting circuit 31e individually light each LED according to an instruction from the power control circuit 310. FIG.

The dimming unit 32 outputs a dimming signal for controlling the first lighting circuit 31 a to the fifth lighting circuit 31 e to the power control circuit 310 of the power supply device 31 . That is, the light control unit 32 controls light emission of the white LED 181, the blue LED 182, and the green LED 183 of the LED module 18 for blue, and the white LEDs 141 and 142 of the LED module 14 for white.

The dimming unit 32 has a timer (not shown), for example, and controls outputs of the first lighting circuit 31a to the fifth lighting circuit 31e through the power control circuit 310 according to time. The dimming unit 32 is composed of hardware such as a dedicated single circuit or multiple circuits, a microcomputer or processor executing a program stored in memory, or a combination thereof. In addition, the dimming unit 32 has a port into which an external interface is inserted and data input/output is performed.

The dimming signal is, for example, a PWM (Pulse Width Modulation) signal indicating a command value of an output current to each LED, and the light amount of each LED is changed according to the command value. The power supply control circuit 310 of the power supply device 31 controls the outputs of the first lighting circuit 31a to the fifth lighting circuit 31e based on the PWM signal, and changes the current flowing through each LED, thereby changing the current flowing through the LED module 18 for blue and the LED module 18 for white. Light adjustment control with the LED module 14 is performed. A PWM signal for changing the light amount of each LED according to the duty ratio may be used as the dimming signal.

FIG. 8 is a graph showing the amount of light of the blue LED module 18 according to the first embodiment. The horizontal axis of FIG. 8 indicates the time, and the vertical axis indicates the amount of light from the LED module 18 for blue. As with the white LED module 14, the blue LED module 18 of this embodiment changes the amount of light according to the time. Specifically, as shown in FIG. 8, the amount of light in the daytime (for example, from 8:00 to 16:00) is 100%, and the amount of light in the morning (for example, from 6:00 to 8:00) and in the evening (for example, from 16:00 to 18:00) is 50%. %, and the amount of light at night (for example, from 18:00 to 6:00) is 20%. Note that the time shown in FIG. 8 is merely an example, and is not limited to the example of FIG. 8, and may be set as appropriate. Also, the amount of light at each time may be changed according to the season. For example, when the season is summer, the daytime hours in which the light amount of the blue LED module 18 is 100% may be longer than in winter. Also, depending on the season, not only the amount of light of the blue LED module 18 but also the chromaticity may be changed.

When the lighting device 1 is used for a long time, the light guide plate 17 deteriorates due to temperature load and the like during lighting, and the light amount and chromaticity of the light emitted from the light guide plate 17 change. Therefore, the light control unit 32, which instructs the power supply control circuit 310, which instructs the first lighting circuit 31a to the third lighting circuit 31c, according to the usage time, based on the information on the deterioration of the light guide plate 17. The output from the first lighting circuit 31a to the third lighting circuit 31c to each LED is corrected. The deterioration information of the light guide plate 17 includes aging deterioration data of the light amount of the light guiding plate 17 and aging deterioration data of the chromaticity. It is assumed that the deterioration information of the light guide plate 17 is obtained in advance by experiments or the like.

FIG. 9 is a graph showing deterioration data of the amount of light of the light guide plate 17 over time. The horizontal axis of FIG. 9 indicates the accumulated usage time [h], and the vertical axis indicates the light amount [%] of the light emitted from the light guide plate 17 . As shown in FIG. 9, the amount of light emitted from the light guide plate 17 decreases as the usage time increases.

10 and 11 are graphs showing aging deterioration data of the chromaticity of the light guide plate 17. FIG. The horizontal axis of FIG. 10 indicates the accumulated usage time [h], and the vertical axis indicates the change value Δx of the x value in the CIE chromaticity diagram of the light emitted from the light guide plate 17 . The horizontal axis of FIG. 11 indicates the accumulated usage time [h], and the vertical axis indicates the change value Δy of the y value in the CIE chromaticity diagram of the light emitted from the light guide plate 17 . As shown in FIGS. 10 and 11, Δx and Δy are positive values, and it can be seen that the x value and y value of the light guide plate 17 increase with age deterioration. Also, it can be seen that the x value and y value of the light guide plate 17 change greatly up to 40,000 hours, and hardly change after 40,000 hours.

FIG. 12 is a flow chart showing the operation of the lighting fixture 1 according to the first embodiment. The flowchart of FIG. 12 is executed by the controller 30 of the lighting fixture 1 . First, deterioration information of the light guide plate 17 is written and stored in the light control unit 32 (S1). The deterioration information of the light guide plate 17 is written into the light control unit 32 via an external interface such as a memory card or USB. The deterioration information of the light guide plate 17 is written when the light control unit 32 is assembled or when the lighting fixture 1 is assembled. Alternatively, the deterioration information of the light guide plate 17 may be written at the manufacturing factory or at the customer's site after the lighting device 1 is completed. However, if the characteristics of the light guide plates 17 incorporated in the lighting device 1 differ significantly from one another, it is necessary to prepare and write deterioration information for each of the light guide plates 17 . Therefore, in such a case, the deterioration information is written when the combination of the light control unit 32 and the light guide plate 17 is determined when the lighting device 1 is assembled or when the product is completed. This makes it possible to improve the efficiency of manufacturing management.

Then, it is determined whether or not to light the lighting fixture 1 (S2). Here, it is determined that the lighting is to be performed when a remote control (not shown) is operated or when the lighting time according to the schedule stored in the control controller (not shown) is reached. Note that the schedule referred to here may be held by the dimming unit 32 . It waits until it is determined that the lighting device 1 should be turned on (S2: NO). Then, when it is determined that the lighting fixture 1 is turned on (S2: YES), the usage time of the lighting fixture 1 is measured in the light control unit 32 (S3). This usage time is the cumulative usage time since the lighting fixture 1 was turned on for the first time.

Then, in the dimming unit 32, correction factors for the white LED 181, the blue LED 182, and the green LED 183 are obtained based on the stored deterioration information and the current usage time (S4). The light control unit 32 obtains a first correction factor for the white LED 181 , a second correction factor for the blue LED 182 , and a third correction factor for the green LED 183 . The first to third correction factors correct the dimming factors of the dimming signals of the white LED 181, the blue LED 182 and the green LED 183. FIG. For example, when the dimming rate of the dimming signal is 50% and the correction rate is 100%, the dimming rate of the dimming signal after correction is 50%. Further, for example, when the dimming rate of the dimming signal is 50% and the correction rate is 150%, the dimming rate of the dimming signal after correction is 75%.

The light control unit 32 obtains the first to third correction factors so that the light amount and chromaticity of the light emitted from the light guide plate 17 are substantially the same as the initial values regardless of the usage time. The initial values are the light amount Q0 and the chromaticity of the light guide plate 17 when the usage time is ₀ hours. The initial values of chromaticity are the x value (x ₀ ) and y value (y ₀ ) in the CIE chromaticity diagram. Specifically, first, the chromaticity correction factors of the white LED 181, the blue LED 182, and the green LED 183 are obtained so that the chromaticity of the light guide plate 17 at the current usage time is the same as the initial chromaticity.

When the usage time is 0 hours, the chromaticity correction rate of white LED 181, blue LED 182, and green LED 183 is 100%. When the usage time is N hours, first, Δx _n and Δy _n when the usage time is N hours are extracted from the deterioration information of the light guide plate 17 . Then, the white LED 181, the blue LED 182, and the green LED 183 are mixed so that the x value (x _n ) and the y value (y _n ) of light obtained by mixing the three colors of the white LED 181, the blue LED 182, and the green LED 183 are the values of the following formulas (1) and (2). Chromaticity correction factors for LED 181, blue LED 182 and green LED 183 are obtained.
_{xn =} x0+[Delta] _xn (1)
y _n =y ₀ +Δy _n (2)

The chromaticity of the light emitted from the light guide plate 17 changes depending on the ratio of the light from the white LED 181 , the blue LED 182 and the green LED 183 . For example, maintaining the dimming rate of white LED 181 and increasing the dimming rate of blue LED 182 and green LED 183 reduces the x and y values of the three-color mixed light. Therefore, in order to cancel out the increased x value (Δx) and y value (Δy) due to deterioration of the light guide plate 17, it is necessary to increase the dimming ratio of the blue LED 182 and the green LED 183. FIG. Therefore, the chromaticity correction factors of the blue LED 182 and the green LED 183 are set to values greater than 100%.

In practice, a plurality of chromaticity correction factors are randomly set for the white LED 181, the blue LED 182, and the green LED 183, and the chromaticity is obtained when the dimming signal is corrected with each chromaticity correction factor. Then, a chromaticity correction factor whose chromaticity is close to x _n and y _n obtained by the formulas (1) and (2) is adopted as the chromaticity correction factor for each LED.

Then, the chromaticity correction factors of the white LED 181, the blue LED 182, and the green LED 183 are adjusted so that the light quantity _Qn of the light guide plate 17 during the current usage time is the same as the initial light quantity _Q0 . 3 correction factors are required. First, the light control unit 32 obtains the decrease value _ΔQn of the amount of light during the usage time N from the deterioration information of the light guide plate 17 . Then, the coefficient α is obtained from the following formula (3).
α=(Q ₀ +ΔQ _n )/Q _n (3)

_Qn is the amount of light obtained by mixing the three colors of the white LED 181, the blue LED 182 and the green LED 183 after applying the chromaticity correction factor. When the usage time is 0 hours, the coefficient α is 1. Then, by multiplying the chromaticity correction factors of the white LED 181, the blue LED 182 and the green LED 183 by the coefficient α, the first to third correction factors are obtained. Here, each chromaticity correction factor is multiplied by the same coefficient α in order to adjust the light amount while maintaining the light ratio of each LED. For example, by correcting the chromaticity of the light guide plate 17 at the current usage time to be the same as the initial chromaticity, the total light quantity Qn after correction is the initial value of the light quantity _Q0 plus the decrease value _ΔQn . may be greater than the amount of light In this case, the coefficient α becomes less than 1, and the chromaticity correction factor of each LED is revised downward.

Then, in the dimming unit 32, the dimming signals of the white LED 181, the blue LED 182 and the green LED 183 are corrected with the calculated first to third correction factors (S5). Specifically, the dimming unit 32 corrects the dimming signal of the white LED 181 with a first correction rate, corrects the dimming signal of the blue LED 182 with a second correction rate, and corrects the dimming signal of the green LED 183 with a third correction rate. Correct with the correction factor. As a result, the output from the first lighting circuit 31a to the white LED 181 is corrected with the first correction factor, the output from the second lighting circuit 31b to the blue LED 182 is corrected with the second correction factor, and the output from the third lighting circuit 31c to the green LED 182 is corrected with the second correction factor. The output to LED 183 is corrected with a third correction factor.

Note that the outputs of the first lighting circuit 31a to the third lighting circuit 31c have an initial dimming rate of less than 100% in consideration of the correction by the correction rate. For example, when the maximum value of the first to third correction factors is 150%, the initial maximum dimming rate (for example, daytime dimming rate) is adjusted so that the dimming rate becomes 100% when the maximum correction rate is applied. light rate) is 65%.

Then, the current based on the corrected dimming signal is supplied from the first lighting circuit 31a to the third lighting circuit 31c to the white LED 181, the blue LED 182 and the green LED 183, and the white LED 181, the blue LED 182 and the green LED 183 are lit (S6). . Further, the white LEDs 141 and 142 of the white LED module 14 are also supplied with the currents of the fourth lighting circuit 31d and the fifth lighting circuit 31e output as a result of the light control unit 32 instructing them through the power supply control circuit 310. and 142 are illuminated.

After that, it is determined whether or not to turn off the lighting device 1 (S7). Here, it is determined that the lights are to be turned off when a remote control (not shown) is operated, or when the turn-off time according to a schedule stored in the controller (not shown) is reached. If the light is not turned off (S7: NO), the process returns to step S3 and the subsequent processes are repeated. On the other hand, if it is to be turned off (S7: YES), the supply of current to each LED is stopped and each LED is turned off (S8). After that, the process returns to step S2 and waits until the light is turned on again.

As described above, in the lighting fixture 1 of the present embodiment, blue light that reproduces the color of the sky is emitted from the light guide plate 17 arranged parallel to the ceiling C, and white light is emitted from three directions surrounding the light guide plate 17 . Light is emitted. As a result, it is possible to produce a visual effect with a sense of depth, such as looking at a blue sky through a sunny or shaded window frame illuminated by sunlight. Further, by adjusting the output of each LED of the blue LED module 18 based on the deterioration information of the light guide plate 17 and the usage time, it is possible to suppress deterioration of the sky reproducibility due to aged deterioration.

Furthermore, in the present embodiment, the correction factors of the white LED 181, the blue LED 182, and the green LED 183 of the blue LED module 18 are individually set according to the deterioration information and the usage time of the light guide plate 17, and the output is individually corrected. be done. As a result, the color balance of the light emitted from the light guide plate 17 can be maintained at the same level as the initial value, compared to the case where the output to each LED is uniformly corrected according to the deterioration information.

Embodiment 2.
A second embodiment will be described. Embodiment 2 differs from Embodiment 1 in the operation of the lighting fixture 1 . The configuration of the lighting fixture 1 is the same as that of the first embodiment. FIG. 13 is a flow chart showing the operation of the lighting fixture 1 according to the second embodiment. The flowchart of FIG. 13 is executed by the controller 30 of the lighting fixture 1 .

First, similarly to Embodiment 1, deterioration information of the light guide plate 17 is written and stored in the light control unit 32 (S11). Then, in the dimming unit 32, correction factor maps for the white LED 181, the blue LED 182, and the green LED 183 are created based on the written deterioration information (S12). The correction rate map indicates the correction rate for each usage time.

FIG. 14 is a diagram showing a first correction factor map created by the light control unit 32 according to the second embodiment. The horizontal axis of FIG. 14 indicates the accumulated usage time [h], and the vertical axis indicates the first correction rate [%] of the white LED 181. As shown in FIG. FIG. 15 is a diagram showing a second correction factor map created by the light control unit 32 according to the second embodiment. The horizontal axis of FIG. 15 indicates the accumulated usage time [h], and the vertical axis indicates the second correction rate [%] of the blue LED 182 . FIG. 16 is a diagram showing a third correction factor map created by the light control unit 32 according to the second embodiment. The horizontal axis of FIG. 16 indicates the cumulative usage time [h], and the vertical axis indicates the third correction rate [%] of the green LED 183. As shown in FIG.

The first to third correction factors for each usage time in the first to third correction factor maps are obtained by the same method as in the first embodiment. The created first to third correction factor maps are stored in the dimming unit 32 .

Then, it is determined whether or not to light the lighting fixture 1 (S13). Here, it is determined that the lighting is to be performed when a remote control (not shown) is operated or when the lighting time according to the schedule stored in the control controller (not shown) is reached. It waits until lighting of the lighting fixture 1 is started (S13:NO). Then, when it is determined that the lighting fixture 1 is turned on (S13: YES), the usage time of the lighting fixture 1 is measured in the light control unit 32 (S14). This usage time is the cumulative usage time since the lighting fixture 1 was turned on for the first time.

Then, in the dimming unit 32, the dimming signals of the white LED 181, the blue LED 182 and the green LED 183 are corrected based on the usage time and the correction factor map (S15). Specifically, the dimming unit 32 refers to the first correction factor map and corrects the dimming signal for the white LED 181 with the first correction factor corresponding to the current usage time. Also, the dimming unit 32 refers to the second correction factor map and corrects the dimming signal of the blue LED 182 with the second correction factor corresponding to the current usage time. Also, the dimming unit 32 refers to the third correction factor map and corrects the dimming signal for the green LED 183 with the third correction factor corresponding to the current usage time. As a result, the output from the first lighting circuit 31a to the white LED 181 is corrected with the first correction factor, the output from the second lighting circuit 31b to the blue LED 182 is corrected with the second correction factor, and the output from the third lighting circuit 31c to the green LED 182 is corrected with the second correction factor. The output to LED 183 is corrected with a third correction factor.

Then, the current based on the corrected dimming signal is supplied from the first lighting circuit 31a to the third lighting circuit 31c to the white LED 181, the blue LED 182 and the green LED 183, and the white LED 181, the blue LED 182 and the green LED 183 are lit (S16). ). Further, the white LEDs 141 and 142 of the white LED module 14 are also supplied with the currents of the fourth lighting circuit 31d and the fifth lighting circuit 31e output as a result of the light control unit 32 instructing them through the power supply control circuit 310. and 142 are illuminated.

After that, it is determined whether or not to turn off the lighting device 1 (S17). Here, it is determined that the lights are to be turned off when a remote control (not shown) is operated, or when the turn-off time according to a schedule stored in the controller (not shown) is reached. If the light is not turned off (S17: NO), the process returns to step S14 and the subsequent processes are repeated. On the other hand, if it is to be turned off (S17: YES), the supply of current to each LED is stopped and each LED is turned off (S18). After that, the process returns to step S13 and waits until the light is turned on again.

As described above, the same effect as in the first embodiment can be obtained in the lighting fixture 1 of the present embodiment. Moreover, compared to the case where the first to third correction factors are obtained for each usage time as in the first embodiment, the processing of the dimming unit 32 during lighting can be simplified.

Embodiment 3.
A third embodiment will be described. Embodiment 3 differs from Embodiments 1 and 2 in the operation of lighting fixture 1 . The configuration of the lighting fixture 1 is the same as that of the first embodiment. FIG. 17 is a flow chart showing the operation of the lighting fixture 1 according to the third embodiment. The flowchart of FIG. 17 is executed by the controller 30 of the lighting fixture 1 .

As shown in FIG. 17, in this embodiment, first, the first to third correction factor maps are written and stored in the dimming unit 32 (S21). The first to third correction factor maps indicate correction factors for each usage time, as in the second embodiment. The first to third correction factor maps are created in advance by an external processing device such as a PC based on the deterioration information of the light guide plate 17 in the same manner as in the second embodiment. Then, it is written into the light control unit 32 via an external interface such as a memory card or USB. After that, the same steps S13 to S18 as in the second embodiment are executed.

As described above, the same effect as in the first embodiment can be obtained in the lighting fixture 1 of the present embodiment. In addition, the processing load of the light control unit 32 can be reduced compared to the case where the light control unit 32 obtains the correction factor and the case where the correction factor map is created as in the first and second embodiments. .

Although the embodiments have been described above, the present disclosure is not limited to the above-described embodiments, and can be variously modified or combined without departing from the gist of the present disclosure. For example, in the above-described embodiment, the dimming unit 32 corrects the dimming signal of each LED to correct the outputs of the first lighting circuit 31a to the third lighting circuit 31c. not to be For example, the dimming unit 32 transmits the dimming signal and the first to third correction factors to the power control circuit 310, and the power control circuit 310 controls the first lighting circuit 31a to the third lighting circuit 31c based on the correction factors. output may be corrected.

Further, in the above embodiment, the deterioration information of the light guide plate 17 is written in the light control unit 32 , but the deterioration information may be written in the power supply control circuit 310 in the power supply device 31 . In that case, the dimming unit 32 simply sends a dimming signal, and the power control circuit 310 performs output correction according to the elapsed time and deterioration information. At this time, the power supply control circuit 310 is assumed to have a timer function for measuring the tool usage time. For example, when the dimming unit 32 sends a daytime dimming signal to the power control circuit 310, the power control circuit 310 outputs 200 mA to the first lighting circuit 31a, 100 mA to the second lighting circuit 31b, and A command value for outputting 100 mA is sent to the third lighting circuit 31c. On the other hand, when 12,800 hours of fixture usage time have elapsed, the power supply control circuit 310 supplies 195 mA corrected to 97.3% to the first lighting circuit 31a, 118 mA corrected to 118.2% to the second lighting circuit 31b, and 118 mA to the second lighting circuit 31b. 3 Send a command value for outputting 119 mA corrected to 118.7% to the lighting circuit 31c. In still another modified example, deterioration information may be written in each of the first lighting circuit 31a to the third lighting circuit 31c instead of the light control unit 32 or the power supply control circuit 310. FIG.

Furthermore, in the above-described embodiment, the case where the dimming signal is corrected for each usage time has been described, but the configuration may be such that the dimming signal is corrected, for example, every 100 hours or every 1000 hours. Also, for the white LED module 14, the dimming signal may be corrected according to the deterioration information of the diffusion cover.

Furthermore, in the above-described embodiment, the description has been given on the premise that the lighting fixture 1 is attached to the ceiling C, but the lighting fixture 1 may be installed on an indoor wall. However, in that case, the white LED module 14 is L-shaped in plan view. In accordance with this, of the four side surfaces of the diffusion cover 13, two adjacent surfaces are used as light emitting surfaces 13-1, and the other two surfaces are used as non-light emitting surfaces 13-2. Other configurations are the same as those of the above embodiment. As a result, even when the lighting device 1 is installed on the wall of the room, similarly to the case where the lighting device 1 is installed on the ceiling C, the blue sky with a sense of depth can be seen through the window frame in the sun or in the shade illuminated by sunlight. It is possible to produce a visual effect that looks like Moreover, the shape of the lighting fixture 1 is not limited to a rectangle, and may be a square box shape.

Further, in the above-described embodiment, the first lighting circuit 31a to the fifth lighting circuit 31e are provided for each LED, but the present invention is not limited to this. For example, a lighting circuit for the white LED 181 and the blue LED 182 of the blue LED module 18 may be shared. As a result, the number of parts can be further reduced, and cost reduction and downsizing of the lighting fixture 1 can be realized.

Furthermore, the structure for holding blue LED module 18 is not limited to the structure described in the above embodiment. Moreover, in the lighting device 1, the white LED module 14 may be omitted and only the blue LED module 18 may be provided as a light source.

Further, in the above-described embodiment, the light control unit 32 may perform two-step control to first reduce the light amount of the green LED 183 and then reduce the light amounts of the white LED 181 and the blue LED 182 . Alternatively, a two-stage control may be employed in which the light amount of the white LED 181 and the blue LED 182 is reduced, and then the light amount of the green LED 183 is reduced. Furthermore, the control of the white LED 181, blue LED 182 and green LED 183 is not limited to those described above, but rather the x and/or y values in the CIE chromaticity diagram, depending on the desired sky color. may be changed to the negative side or the positive side.

1 lighting fixture, 10 light source unit, 11 flange, 12 V spring, 13 diffusion cover, 13-1 light emitting surface, 13-2 non-light emitting surface, 14 white LED module, 15 module holding portion, 15-1 mounting flange, 16 lower guide plate, 16-3 protrusion, 17 light guide plate, 17-1 end surface, 17-2 end surface, 18 blue LED module, 18-1 through hole, 19 upper guide plate, 21 packing, 22 packing, 23 insulation 24 module holding part 25 fixing member 25-1 protrusion 26 light guide plate cover 27 upper cover 30 control part 31 power supply device 31a first lighting circuit 31b second lighting circuit 31c third lighting circuit, 31d fourth lighting circuit, 31e fifth lighting circuit, 32 dimming unit, 33 air gap, 50 instrument body, 51 main surface, 51-1 bolt hole, 51-2 wire hole, 52 side surface, 53 V spring mounting bracket , 54 terminal block, 61 nut, 140 substrate, 141 white LED, 142 white LED, 180 substrate, 181 white LED, 182 blue LED, 183 green LED, 310 power control circuit, B suspension bolt, C ceiling, H embedding hole .

Claims (6)

a blue LED module having a white LED, a blue LED, and a green LED;
a light guide plate that diffuses the light from the blue LED module and emits surface light;
a control unit that controls the blue LED module to reproduce the color of the sky,
The lighting fixture, wherein the controller individually corrects outputs to the white LEDs, the blue LEDs, and the green LEDs based on the deterioration information and the usage time of the light guide plate. 2. The lighting fixture according to claim 1, wherein the deterioration information includes aging deterioration data of light quantity of the light guide plate and aging deterioration data of chromaticity of the light guide plate, and is stored in advance in the control unit. The control unit
Obtaining chromaticity correction factors of the white LED, the blue LED, and the green LED based on the aging deterioration data of the chromaticity and the usage time, respectively;
3. The lighting fixture according to claim 2, wherein the chromaticity correction factors of the white LED, the blue LED, and the green LED are adjusted based on the aging deterioration data of the amount of light and the usage time. The control unit, based on the deterioration information and the usage time,
a first correction factor for correcting the output to the white LED;
a second correction factor for correcting the output to the blue LED;
obtaining a third correction factor for correcting the output to the green LED;
correcting the output to the white LED using the first correction factor;
correcting the output to the blue LED using the second correction factor;
4. The lighting fixture according to any one of claims 1 to 3, wherein the third correction factor is used to correct the output to the green LED. The control unit
a first correction factor map including the first correction factor for each usage time;
a second correction factor map including the second correction factor for each usage time;
The lighting fixture according to claim 4, wherein a third correction factor map including the third correction factor for each usage time is created. Created based on the deterioration information in the control unit,
a first correction factor map including a first correction factor for correcting the output to the white LED for each usage time;
a second correction factor map including a second correction factor for correcting the output to the blue LED for each usage time;
2. The lighting fixture according to claim 1, wherein a third correction factor map including a third correction factor for correcting the output to the green LED for each usage time is stored in advance.

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