WO1980002735A1 - Luminaire d'eclairage indirect - Google Patents

Luminaire d'eclairage indirect Download PDF

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Publication number
WO1980002735A1
WO1980002735A1 PCT/US1980/000708 US8000708W WO8002735A1 WO 1980002735 A1 WO1980002735 A1 WO 1980002735A1 US 8000708 W US8000708 W US 8000708W WO 8002735 A1 WO8002735 A1 WO 8002735A1
Authority
WO
WIPO (PCT)
Prior art keywords
source
light
lens
luminaire
lateral
Prior art date
Application number
PCT/US1980/000708
Other languages
English (en)
Inventor
P Ngai
D Herst
Original Assignee
P Ngai
D Herst
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by P Ngai, D Herst filed Critical P Ngai
Publication of WO1980002735A1 publication Critical patent/WO1980002735A1/fr

Links

Classifications

    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S6/00—Lighting devices intended to be free-standing
    • F21S6/005—Lighting devices intended to be free-standing with a lamp housing maintained at a distance from the floor or ground via a support, e.g. standing lamp for ambient lighting
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/402—Lighting for industrial, commercial, recreational or military use for working places
    • 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Definitions

  • the present invention relates to a luminaire (i.e., the complete lighting unit); and more particularly, it relates to a luminaire which may be used for indirect lighting particularly in large open areas such as are commonplace in modern offices.
  • a luminaire i.e., the complete lighting unit
  • a luminaire which may be used for indirect lighting particularly in large open areas such as are commonplace in modern offices.
  • one of the advantages of the invention is that its use is not limited only to open office areas, but rather, it can be carried through to the lighting of hallways, executive suites or conference rooms.
  • the invention is particularly suited to provide illumination for typical office situations with efficient use of energy while having those characteristics which recent research has shown to be desirable from a psychological viewpoint.
  • Modern offices are characterized by large open spaces having a ceiling height normally about eight feet, but which may extend to nine feet.
  • the space may be sectioned for privacy by movable wall partitions. These partitions normally have a height of about five to seven feet.
  • Direct lighting as a source of lighting for offices provides high luminance for task areas, but in general, the quality of lighting is not good in terms of visibility and visual comfort of a person.
  • Lenses have been used in luminaires employing fluorescent lamps for direct lighting.
  • One type of lens employs individual conical or sperical lenses in a repeating pattern.
  • Another uses parabolic reflectors to direct light downwardly.
  • a light transmission pattern is created in which the light is directed downwardly and generally confined within an angle of about 45 degrees from the vertical.
  • neither of these systems provides ambient lighting for vertical surfaces which has been found to be a distinct preference and produces feelings of spaciousness and comfort.
  • Indirect lighting obviates the problem of glare perceived by an observer, but most indirect lighting systems have the disadvantge of collecting dust which gathers on the lamps and any reflectors beneath the lamps, arid this is a major source of reduced luminance.
  • Another disadvantge of most indirect lighting systems is a psychological one. Research has shown that human beings have a distinct preference for lighter rooms which are uniformaly illuminated. In other words, a person may comfortably perform a task in an area at a relatively low luminance level provided there is a minimum of light available and the luminance pattern does not change substantially within his field of view.
  • the luminance level is substantially lower than that of the area from which a person enters, there will be a period of adaptation, but-once the adjustment has been effected, there is little difficulty in performing tasks if the illumination meets the minimum requirements for the task. Further, people prefer to be able to see the source of light. It provides a sense of perspective and has been found to be a factor to be considered in providing office lighting. As indicated, most indirect lighting systems have a principal object the generation of light while masking completely the origin of the light.
  • Lenses have in the past been placed above a source of light. Some of these lenses do not generate a pattern of illuminance above the luminaire which is uniform. Either a very bright spot is created above the luminance (the more common characteristic), or a dark area is generated. In either case, the substantial variation in the illumination pattern on the ceiling is easily perceived and is undesirable. Further, in the case of the bright spot, inefficiency results because most of the light is reflected back to the luminaire rather than being used to light the room.
  • the luminaire of the present invention has as a principal object the provision of indirect lighting of large open office systems by achieving a uniform distribution of light (i.e. illumination pattern) on a ceiling over the luminaire as well as by fanning the light out laterally to extend the uniform luminance on the ceiling to adjacent areas not directly above the luminaire. Further, due to the reinforcement and bending of lateral rays, vertical surfaces are illuminated even at a substantial distance from the unit.
  • the luminaire includes an opaque housing beneath the source of light which preferably includes two or three fluorescent lamps placed side by side.
  • the length of the lamps helps to distribute the light along the length of the housing.
  • a lens is mounted to the housing above the source, and in the illustrated embodiment, it includes a generally flat upper portion and lateral portions which curve downwardly and join to the housing to enclose the lamps.
  • the upper portion of the lens includes a flat upper surface and a series of light-diverging prisms on the lower surface, facing the source of light. Adjacent prisms are spaced by a flat portion.
  • the function of the prisms is to refract and diverge incident light, and the function of the flats is to permit incident light to pass between the prisms.
  • the prisms and flats cooperate to provide a uniform pattern of luminance on a ceiling above the luminaire which normally has a high reflectance to provide good indirect lighting qualities. This uniformity is effective when the ceiling is placed about two to three feet above the upper surface of the lens and the effect persists even though the spacing is reduced to one foot.
  • a reflector is located beneath the light sources in the housing to direct light from the sources out to the lateral portions of the lens. Some of the reflected light is transmitted upwardly to the upper portion of the lens.
  • the lateral lens portion or portions are curved downwardly from the top lens portion to the upper edge of the housing, and they contain a plurality of external prisms extending the length of the lens
  • the placement of the source of light in the housing is such that it cannot be seen directly by an observer having an eye level the same height as or slightly above the source. Further, because of the interposition of the lens, the light source cannot be seen directly from any elevation.
  • luminaires of the present invention may be spaced at relatively wide distances-if they are associated, for example, with movable wall panels since adjacent luminaires will both exhibit this fanning effect and achieve a luminance for indirect lighting which not only provides uniform ambient lighting but also more than adequate task lighting at the same time.
  • the lateral lens portions of the luminaire transmit direct and reflected light from the source to illuminate vertical surfaces such as walls and provide a brighter ambient lighting.
  • the prisms on the curved lateral portion of the lens are on the exterior surface of the lens, they act to segment the incident light and provide a series of softly glowing lines of light which are perceptible to a person standing to the side of the luminaire, but without transmitting a direct image of the source.
  • persons in a space illuminated by the present invention have the psychological benefit of knowing where the light is coming from, yet they do not experience the discomfort of glare which accompanies normal direct lighting.
  • the luminaire of the present invention is mounted to the top of a movable wall panel at a height of 72 to 84 inches, the light source is out of the direct line of sight of a person less than about seven feet tall.
  • Nevirtheless he is capable of seeing light emanating from the exit surfaces of the prisms on the curved lateral portions of the lens. A small amount of light also emanates from the riser surfaces of the prisms through internal reflection, and this light is greatly diminished in luminance, but it extends downwardly from the luminaire, thereby providing a visual image of the source of light even to a person sitting at a work surface mounted to the same or adjacent wall panel to which the luminaire is mounted.
  • the lens provides a dust cover for the lamps, and the smooth exterior surface of the upper portion of the lens facilitates cleaning. That is, there are no crevices in which dust can gather.
  • a major source of reduction of luminance in indirect lighting is obviated, namely, the collection of dust on the lens or lamps.
  • FIG. 1 is a side elevational view of a typical movable panel wall system on which a luminaire constructed according to the present invention is mounted;
  • FIG. 2 is an upper side perspective view of the luminaire Of FIG. 1;
  • FIG. 3 is a transverse cross sectional view of the luminaire of FIG. 2;
  • FIG. 4 is a fragmentary longitudinal vertical cross sectional view of one end of the luminaire of FIG. 2;
  • FIG. 5 is a diagrammatic cross sectional view of the right side of a lens incorporated into the luminaire of FIG. 2.
  • reference numeral 10 generally designates a movable wall panel at the top of which a luminaire generally designated 11 is mounted by means of an upright mount 12 extending from the top of the panel 10.
  • the mount 12 may take the form of a pair of upright arms enclosed in a sheet metal casing.
  • a cabinet generally designated 13 may be mounted to the wall panel 10, and a work surface 14 may be provided beneath the cabinet 13.
  • the fixture 10 is seen to include a housing 15, first and second end caps 17, 18 and an upper lens 19.
  • the housing 15 includes a generally flat bottom wall 21 and upwardly curved side walls 22, 23.
  • the housing 15 may be formed by extruded aluminum since its cross section is uniform throughout. It is then cut to the desired length.
  • a reflector generally designated 30 is mounted in the housing 15 by screws 31 secured in the screw mounts 25, 26.
  • the reflector 30 is symmetrical about a vertical plane P extending through the longitudinal center of the luminaire to form side halves 33, 34.
  • the side 33 includes a flat portion 35 beneath a first lamp L1; and to the side of the lamp L1, the reflector is smoothly curved upwardly to form a portion 36, the edge of which is formed into a mounting flange 37.
  • the central portion of the reflector is turned upwardly as at 39.
  • the surface of the reflector may vary according to the effect desired, but for general office use, a specular surface may be used.
  • the illustrated embodiment includes a second lamp L2 located within the housing 22. Both lamps are mounted between a pair of conventional lamp holders, one of which is shown in FIG. 3 at 39 mounted to a first intermediate wall 30. A third lamp may be used by ⁇ moving the two lamps shown further apart and inserting a third lamp between them. The center lamp would be raised slightly.
  • the luminaire may also be used with only a single lamp or with a switch for illuminating one, two or three lamps, as desired.
  • a lens generally designated 41 is mounted to the housing 15 by means of first and second elongated fittings 44, 45 which releasably couple respectively to the inwardly extending lips 27, 28 of the housing 15.
  • the lens is mounted in such a manner that it can be removed easily, simply by pressing the sides, yet it prevents dust and dirt from entering the interior of the luminaire.
  • the end seals will be described in connection with FIG. 4.
  • the lens 41 includes an upper lens portion 48, and first and second curved lateral portions 49, 50.
  • the lens 41 is also symmetrical about the plane P. Because both side halves of the fixture operate in a similar manner, the features and advantages of the invention can be achieved simply by extending the housing along the plane P for a luminaire adapted to mount to the vertical surface of a wall, such as in a hall or conference room, as distinguished from the bottom-mounted luminaire shown.
  • the end cap 17 is seen in detail. It is received on and held to an intermediate wall 53 which serves to mount the lamps and also to support a ballast B in the manner illustrated. Thus, the end cap 17 cooperates with the intermediate wall 53 to provide a housing for the ballast B which may be mounted by means of a flexible grommet 55 to a platform 56 cantilevered from the intermediate wall 53 to reduce noise transmission from the ballast B.
  • FIG. 4 there is also shown a gasket 58 which seals the left edge of the lens 41 against the entry of dust into the interior of the luminaire.
  • a similar gasket is provided on the other intermediate wall 40.
  • FIG. 5 illustrates the structure of one side of the lens 41 in relation to the center of lamp L1, designated 60 in FIG. 5, the top portion 48 of the lens has a flat upper surface designated 61. This facilitates dusting of the fixture and provides no crevices for collecting dust or dirt.
  • the under surface of the top portion 48 of the lens 41 is formed into a plurality of equilateral prisms 62 which extend the length of the lens, and are separated by flat portions or simply "flats" designated 63.
  • the principal function of the prisms 62 is to cause incident light to diverge through refraction.
  • parallel incident rays 65, 66 which are incident respectively on the surfaces 62A and 62B.
  • the ray 65 is refracted and travels along the path 67 through the transparent material of the lens to the upper exit surface 61 thereof where it" is again refract ⁇ -d and travels along the divergent path 68.
  • the ray 66 follows the path 69 in the lens and emerges along the path 70 from the exit surface 61.
  • the light which is incident on the surfaces of the prisms 62 is widely dispersed and diverged through refraction.
  • 61 is diverged in such a manner that the resulting pattern of luminance on a horizontal surface above the luminaire for as close a spacing as one foot is substantially uniform without either bright or dark areas.
  • the material of the lens preferably is clear virgin acrylic, although other materials such as Lexon may also be used.
  • the lateral portion 50 of the lens its principal function is to bend incident light from the source and to "fan" the light out laterally so that it is spread to the side of the fixture on a ceiling and may also be used to illuminate any vertical surfaces in the neighboring vicinity. Because of the reduction in intensity due to the greater distance traveled by the light passing through the lateral portion 50 as well as the fact that the flux will be spread over a greater area of any illuminated horizontal surface due to the increased angle of incidence, a principal function of the reflector 30 and particularly the curvature of the portion 36 is to direct light from the source L1 toward the lateral portion 50 of the lens.
  • the lateral portion 50 of the lens has a uniformly curved, smooth interior surface 80 which has a radius of curvature centered at 81.
  • the outer surface of the lateral portion 50 of the lens is formed into a plurality of prisms, the points of which are designated respectively P1-P21 for convenience.
  • Each of the prisms P1-P21 includes an active or emitting surface such as that designated 84 for the prisms P3 from which light incident on the inner surface 80 will emerge, and a second surface 85 referred to as a riser or return surface.
  • the structure of the prisms P1-P21 is illustrated in Table I where the an les RHS LHS LHS-1 and LHS-2 are defined in FIG. 5.
  • dimension "h" is the height of a prism.
  • the nominal thickness of the lateral portion 50 from the uniformaly curved surface 80 to the intersection between an adjacent riser 85 of one prism and the active surface of the adjacent prism is 125 mils.
  • the center 60 of the light source is approximately 0.625 inches below the center 81 of the radius of curvature of the surface 80 / and approximately two inches to the left of it. It will also be observed that the center 81 is in approximately the same horizontal plane as the upper extension of the curved side 22 of the opaque housing 15. Thus, the light sources cannot be seen directly by an observed eye level is the same height as the source .
  • the luminaires are preferably mounted at a height of six to seven feet above the floor (that is, the height to the top of the side wall 22 of the housing 15), a person who is less than about seven feet tall will have a line of sight which will be above the lamps. However, as will be explained presently, he will perceive where the light is coming from.
  • three light rays are designated 90, 91 and 92; and for purposes of illustration, they are shown as emanating from the center 60 which is an idealized point.
  • the rays take the respective paths 90A, 91A and 92A; and when they exit from the associated active surfaces of the prisms as illustrated, they travel along the paths 90B, 91B and 92B respectively. It can thus be seen that the light from the source is spread out in an increasing pattern from the top to the side edge of the lateral portion 50 of the lens. Further, it is segmented in the sense that an observer viewing the lens from the side at normal angles will see a series of softly glowing horizontal lines and therefore perceive where the light is emanating from. Not illustrated in FIG.
  • the overall luminance can be maintained at a relatively low level and yet provide adequate task lighting.
  • the luminaires can be placed at relatively greater distances than would otherwise be required to achieve complete illumination coverage and uniform luminance.
  • Vertical surfaces in a room employing these luminaires are also illuminated in a substantially uniform manner even at eye level and above, because of light direct from the lateral lens portions and reflected off the ceiling.
  • human perception of whether a room is adequately lighted depends to some extent on whether the vertical surfaces are visibly illuminated.
  • the lens act as a dust cover to prevent dust and dirt from reducing the luminance emanating from the source, and because the upper surface of .the top portion of the lens is flat, it facilitates cleaning. It will be observed that at least some light emanates from the riser surfaces of the prisms on the lateral portion of the lens, and this light is directed downwardly below the horizontal. It may not be enough light to provide adequate task lighting but it nevertheless provides a visual image to an observer seated at a work area so that he can see where the light is coming from.
  • the dimensions of the lens may be altered without substantially changing the photometric properties of the luminaire, particularly, if the height-to-spacing proportions of the various prisms is maintained.
  • fluorescent lamps are preferred, other lamps may also be used; and lamps not yet developed may have equal or better results.
  • the number of lamps or type of ballast are not critical to achieving the overall desired results. It is, therefore, intended that all such modifications and substitutions be covered as they are embraced within the spirit and

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

Le luminaire comprend une source de lumiere (L1, L2) dans une enceinte opaque (15) qui s'etend sous la source et vers le haut autour des cotes de la source pour soustraire celle-ci a la vue directe, d'une ligne horizontale de meme niveau que la source. Une lentille (41) est montee sur l'enceinte au-dessus de la source et s'etend sur la peripherie pour rejoindre le bord superieur de l'enceinte. La lentille comprend une partie superieure de dispersion de la lumiere (48) qui fait diverger une partie de la lumiere (48) et deplace seulement une autre partie de la lumiere provenant de la source pour assurer une distribution uniforme de l'intensite lumineuse sur un plafond se trouvant au-dessus de la source. La lentille comprend egalement une portion laterale de reflexion de la lumiere (50) qui recoit la lumiere de la source et la disperse en eventail lateralement au dessus des cotes de l'enceinte pour continuer l'illumination uniforme du plafond et pour illuminer les surfaces verticales au voisinage du luminaire. Un reflecteur (30) sous la source dirige la lumiere sur la portion laterale de reflexion de la lumiere de la lentille pour compenser au moins partiellement le fait que la lumiere passant au travers de la partie laterale de la lentille parcourt normalement une distance plus longue sur la surface qu'elle illumine et egalement frappe la surface horizontale sous un angle d'incidence plus grand. La lentille et l'enceinte cooperent pour enfermer la source de lumiere et empecher les poussieres d'entrer, et la portion laterale de la lentille est une source visible de lumiere pour une personne se trouvant dans la piece eclairee.
PCT/US1980/000708 1979-06-08 1980-06-06 Luminaire d'eclairage indirect WO1980002735A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4697079A 1979-06-08 1979-06-08
US46970 1979-06-08

Publications (1)

Publication Number Publication Date
WO1980002735A1 true WO1980002735A1 (fr) 1980-12-11

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PCT/US1980/000708 WO1980002735A1 (fr) 1979-06-08 1980-06-06 Luminaire d'eclairage indirect

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WO (1) WO1980002735A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698734A (en) * 1984-06-01 1987-10-06 Peerless Lighting Corporation Lensed indirect luminaire with side angle brightness control
EP0272681A2 (fr) * 1986-12-23 1988-06-29 Hartmut S. Engel Système d'éclairage
DE29519708U1 (de) * 1995-12-12 1997-04-10 Zumtobel Licht Gmbh, Dornbirn Leuchte mit wenigstens einem langgestreckten Leuchtmittel
GB2302323B (en) * 1995-06-19 1999-01-13 Grusan Di Sandrin Giannino & C Container with improved closure cover
WO2001044714A3 (fr) * 1999-11-30 2002-05-10 Reflexite Corp Systeme luminaire
WO2007087947A1 (fr) * 2006-02-01 2007-08-09 Zumtobel Lighting Gmbh Lampe allongee dotee d'extremites a section transverSale retrecie

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1941079A (en) * 1931-09-05 1933-12-26 Holophane Co Inc Lighting apparatus employing rectilinear light sources
US2198077A (en) * 1938-08-05 1940-04-23 Curtis Darwin Illuminating fixture
US2382538A (en) * 1943-01-14 1945-08-14 Day Brite Lighting Inc Portable electric lighting fixture
US2777053A (en) * 1953-09-28 1957-01-08 Willis L Lipscomb Direct-indirect reversible luminaire
US2800574A (en) * 1953-06-29 1957-07-23 Compco Corp Mounting for electric lighting fixtures
US2983813A (en) * 1959-01-28 1961-05-09 Pfaff & Kendall Sealed pendant lighting device
US3328578A (en) * 1965-06-04 1967-06-27 Gen Electric Trough-shaped luminaire with housing
US4054793A (en) * 1973-08-22 1977-10-18 Sylvan R. Shemitz Associates, Inc. Lighting system
US4112483A (en) * 1976-07-28 1978-09-05 Optical Coating Laboratory, Inc. Lighting fixture and method using multiple reflections

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1941079A (en) * 1931-09-05 1933-12-26 Holophane Co Inc Lighting apparatus employing rectilinear light sources
US2198077A (en) * 1938-08-05 1940-04-23 Curtis Darwin Illuminating fixture
US2382538A (en) * 1943-01-14 1945-08-14 Day Brite Lighting Inc Portable electric lighting fixture
US2800574A (en) * 1953-06-29 1957-07-23 Compco Corp Mounting for electric lighting fixtures
US2777053A (en) * 1953-09-28 1957-01-08 Willis L Lipscomb Direct-indirect reversible luminaire
US2983813A (en) * 1959-01-28 1961-05-09 Pfaff & Kendall Sealed pendant lighting device
US3328578A (en) * 1965-06-04 1967-06-27 Gen Electric Trough-shaped luminaire with housing
US4054793A (en) * 1973-08-22 1977-10-18 Sylvan R. Shemitz Associates, Inc. Lighting system
US4112483A (en) * 1976-07-28 1978-09-05 Optical Coating Laboratory, Inc. Lighting fixture and method using multiple reflections

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698734A (en) * 1984-06-01 1987-10-06 Peerless Lighting Corporation Lensed indirect luminaire with side angle brightness control
EP0272681A2 (fr) * 1986-12-23 1988-06-29 Hartmut S. Engel Système d'éclairage
EP0272681B1 (fr) * 1986-12-23 1995-06-07 Hartmut S. Engel Système d'éclairage
GB2302323B (en) * 1995-06-19 1999-01-13 Grusan Di Sandrin Giannino & C Container with improved closure cover
DE29519708U1 (de) * 1995-12-12 1997-04-10 Zumtobel Licht Gmbh, Dornbirn Leuchte mit wenigstens einem langgestreckten Leuchtmittel
WO2001044714A3 (fr) * 1999-11-30 2002-05-10 Reflexite Corp Systeme luminaire
US6612723B2 (en) 1999-11-30 2003-09-02 Reflexite Corporation Luminaire system
WO2007087947A1 (fr) * 2006-02-01 2007-08-09 Zumtobel Lighting Gmbh Lampe allongee dotee d'extremites a section transverSale retrecie

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