EP0954717A1 - Dispositif d'eclairage - Google Patents

Dispositif d'eclairage

Info

Publication number
EP0954717A1
EP0954717A1 EP97904858A EP97904858A EP0954717A1 EP 0954717 A1 EP0954717 A1 EP 0954717A1 EP 97904858 A EP97904858 A EP 97904858A EP 97904858 A EP97904858 A EP 97904858A EP 0954717 A1 EP0954717 A1 EP 0954717A1
Authority
EP
European Patent Office
Prior art keywords
lamp
housing
ballast
fixture according
power
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.)
Withdrawn
Application number
EP97904858A
Other languages
German (de)
English (en)
Other versions
EP0954717A4 (fr
Inventor
Kenneth Lau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0954717A1 publication Critical patent/EP0954717A1/fr
Publication of EP0954717A4 publication Critical patent/EP0954717A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • 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
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/02—Arrangement of electric circuit elements in or on lighting devices the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/15—Thermal insulation
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • 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
    • F21Y2103/30—Elongate light sources, e.g. fluorescent tubes curved
    • F21Y2103/37—U-shaped
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention is primarily designed for use with one or more fluorescent lamps because of their widespread popularity, but accommodates any type of lamp which requires an auxiliary power stabilizing circuit.
  • fluorescents In addition to fluorescents, commonly used alternative lighting of this type includes low voltage halogen lamps, and high intensity discharge (HID) lamps, both of which are more compact and efficient than incandescents. All of these lamps require a circuit device to condition the power, as they will not operate on the U.S. standard, 110 volts at 60 Hz. current.
  • the lamps will be described as “fluorescent”, and the power stabilizing circuit as the “ballast”, but it will be understood that the term “fluorescent” refers generically to any lamp which requires an on-board (or auxiliary) device or circuit to stabilize the current or the voltage, or both, and such circuit or device is covered by the term "ballast".
  • the ballast converts the local power, whether it be AC, DC, 110-Volt, 277-Volt or whatever, to the form for which the lamp and system were designed, so the same lamp is used everywhere, with the electronics being the adaptive factor.
  • these lamps come with the baggage of the auxiliary circuit requirement, and an inherent circuit overheating problem. Heat damage will result from continued exposure to the hot cathodes of the lamp, especially if the circuit is enclosed in the same housing as the lamp.
  • the subject lamps are more efficient than incandescents by a factor of up to eight or ten to one, nonetheless up to 75% of the energy they consume is dissipated as heat.
  • This disclosure specifically addresses ceiling-mounted fixtures, including "cans” recessed behind the ceiling panels. Retrofitting these cans to accept fluorescent lighting, or other lighting which is more efficient than incandescent, presents several problems. For one thing, the compact fluorescent lamps and adapters which are designed to replace light bulbs are generally too long to fit within the can and extend out slightly beyond the housing in ceiling-mount installations with vertical lamps. The can's translucent diffusion covers may have to be removed, resulting in the creation of both glare and aesthetic problems, which present obstacles to upgrading hotel corridors, lobbies and rooms and other large commercial establishments whose multiplicity of can installations cry for conversion to low-energy lighting.
  • the typical compact fluorescent adaptor and lamp designed for retrofitting will not fit at all, since the tube does not have the option of extending beyond the boundary of the can.
  • the instant invention fulfills the above-stated need by providing specially designed recessed lamp fixtures which come in several variations, but in all instances having a ballast compartment housed separately from the lamp housing.
  • a ballast compartment housed separately from the lamp housing.
  • several other design features keep the ballast cool.
  • the passageway between the ballast and the lamp is preferably home to a moving air curtain which continuously draws up cool air alongside the ballast, driven by lamp- induced heat convection.
  • the ballast is beneath the lamp if practicable, therefore it is substantially upwind from the hot airflow generated by the electrodes or filament, rather than immersed in it immediately above the hottest part of the lamp, as is traditional. Cooling air passes up around the ballast first, before it reaches the lamp, and then into the can, accumulating in the upper part where it dissipates by conduction, radiation and convection through ventilation holes.
  • One recessed can design has a ballast compartment which is separated from the rest of the fixture and is mounted in an annular ring flush against the bottom surface of the ceiling around the lamp opening.
  • This rim-mounted circuit connects to the fluorescent base mounting socket, diverting incoming power from the power company and delivering it to the lamp in useable form.
  • This version embodies the essential features of the invention wherein the ballast is separate from, and in fact does not even share a compartment with, the lamp, and a corridor for an air curtain is established between ballast and lamp.
  • ballast housing made of heat insulating material and whose only opening is in its bottom wall.
  • the ballast housing is located remotely from the interior of the light source housing and/or a reflector housing.
  • a heat sink structure is mounted in the bottom opening of the ballast housing to draw heat away from the power stabilizing circuitry.
  • the heat sink structure may take the form of a cosmetic trim cover member.
  • Figure 1 illustrates a compartment containing the ballast or other power stabilizing circuitry, with the annular cover exploded;
  • Figure 2 illustrates an adapter socket exploded from a fluorescent tube designed for use in replacing incandescent bulbs
  • Figure 3 is a side elevation view, partly in section, of a complete ceiling can mount as it would appear substantially in-place using a ballast compartment which is separate from the socket mount and connected thereto with wiring;
  • FIG 3a is an isometric view of the ballast housing ring of the fixture illustrated in Figure 3, shown in isolation from the remaining structure of the fixture;
  • Figure 4 is an exploded isometric view of a first alternative embodiment of a recessed lamp fixture with portions broken away for clarity;
  • Figure 5 is a side elevation view of the first alternative embodiment showing it mounting in a ceiling filled with insulation
  • Figure 6 is a side elevation view of the first alternative embodiment showing it with a differently configured ballast housing
  • Figure 7 is a partial top plan view of a first alternative heat sink trim
  • Figure 8 is a partial isometric view of a second alternative heat sink trim
  • Figure 9 is an isometric view of a baffle that can be used with the heat sink trim illustrated in Figure 10;
  • Figure 10 is an exploded view of a third alternative heat sink trim that has a planar lens
  • Figure 11 is an isometric view of a fourth alternative heat sink trim that has a globe shaped lens
  • Figure 12 is an exploded isometric view of a second alternative embodiment of a recessed lamp fixture
  • Figure 13 is an exploded isometric view of third alternative embodiment of a recessed lamp fixture.
  • the fixture of the invention comes in two basic styles: the ceiling can retrofit, and the newly designed recessed lamp fixture models.
  • the can retrofit design is provided with a separate ballast compartment and lamp mounting socket. All of the models remove the ballast from the lamp housing and one model creates a circulating air space between the ballast and lamp housing.
  • the ballast is configured as an annular rim around the lamp face, in which the ballast housing serves as a reflective and decorative element as well as being safely positioned beneath and removed from the hot lamp. This ring need not be round, as there are square cans as well as round ones and a few other polygonal shapes. Because the ballast is protected as a result of the invention, all lamps used in the disclosed fixtures would be of the type which do not integrate the ballast as disposable structure with the tube.
  • the ballast-mounting compartment is shown in isolation in Figure 1 for a typical can mount of the two-piece configuration in which the ballast and lamp socket are separate.
  • the compartment 10 is formed by an annular trough 11, which together with the annular cover plate 12, encloses the ballast or other signal processing device forming the circuitry 14 which connects to the incoming power supply with conductors 16 and outputs a processed power signal ready for use by the lamp through the wires 18.
  • the cover plate 12 has notches 20 to accommodate the clips 22 which are used to engage the wire bales 23 in the typical ceiling mount can design.
  • the unit of Figure 1 can be coupled through an existing incandescent socket or connected directly to house current power wires.
  • ballast in the annular compartment and the lamp socket as shown in Figure 2 at 24 is a mechanical mount which physically accommodates the pin structure of the fluorescent lamp with an existing incandescent lamp socket. It also houses the internal wiring, not shown, which diverts power from the mounting socket in the can to the processing circuitry 14.
  • the annular ballast compartments 10 and 25 of Figures 1 and 3, respectively, are representative of any of the compartments for any of the configurations having an annular ballast rim.
  • FIG 2 illustrates a typical replacement fluorescent lamp 26 shown exploded from the fluorescent lamp mounting socket 24.
  • This type of socket is too small to house the ballast as shown and is the second piece of the two-piece system of Figure 3 in which the other piece is the ballast compartment rim 25 which is similar to the annular compartment of Figure 1 which is frontally mounted on the ceiling.
  • Figure 3 also illustrates a replacement tube having a reflector 32, representative of a commercially available line of lamps.
  • a cover 34 over the face of the lamp spans the interspace internally of the annular compartment 25. Note that the reflector 32 and the cover 34 together resemble a flood light, and the extended can length effected by the use of the ballast housing 25 enables the fluorescent replacement to be used without extending beyond the can structure.
  • an air passageway 36 can be seen between the reflector 32 and the ballast compartment 25.
  • This passageway is substantially continuous, and is vertical and wide enough that air freely flows up into the can 37 and out ventilating holes in the top of the can. Even though the flow is relatively slow, because the ballast rim is disposed below the lamp, it is not exposed to accumulated heat as it would be were it internal of the can, so that the effects of the thermally-aware positioning and the cool airflow are adequate to prevent overheating of the ballast, which would not be much hotter than ambient air temperature.
  • the ballast housing 25 does much more than just hide the ballast.
  • the cylindrical inside wall of the housing defines a continuation of the flood reflector 32 and itself acts as a light- channelling reflector. It also has the effect of extending the overall length of the can so that the most exposed part of the lamp is still adequately recessed and it will not glare out the side, nor be visible to the eye from across the room.
  • This advantage is applicable to all of the lamp variations that are substantially elongated, such as the fluorescent lamp 26 of Figure 2, although with the electronics being separated from the base of the lamp unit its overall length is reduced and is not the problem that it would be otherwise.
  • Higher wattage lamps however come in longer sizes, and the cooling characteristics of the inventive improvements set forth herein make practical the use of longer lamps with higher wattage ratings.
  • FIG. 4-6 The first alternative embodiment of a newly designed lamp fixture is illustrated in Figures 4-6. It is generally designated numeral 40. It has a light source housing 41 having a generally cylindrical shape. The bottom end of light source housing 41 has a reduced diameter to form an annular lip 42. Enclosed within the light source housing is a socket 43 and lamp 44. Annular lip 42 is secured to the interior of annular ballast housing 46 by a friction fit or by use of conventional mechanical fasteners. Ballast housing 46 is hollow and has its bottom end open. It may be formed as a single chamber or it may have a pair of wall partitions 47 that divide it into chambers 48 and 49.
  • Ballast housing 46 has an outer annular wall 50 and internal retainer protrusions 52 on its inner surface mate with clips 54 extending upwardly from the top surface of heat sink trim 56. Apertures 57 and 58 are formed in top wall 60 of ballast housing 46. Wires 62 have their one end connected to socket 43 and pass through aperture 57 and are connected to ballast wires 64. Ballast 65 is formed of a PC board with its electrical components mounted thereon. A pair of fingers 67 extend upwardly from the top surface of the PC board of ballast 65. Clips 68 attach the fingers 67 to annular wall 69 that extends upwardly from the inner edge of heat sink trim 56 for securing these two members together. Power output wires 70 pass through aperture 58 and are connected to ballast 65.
  • a sensor such as a photo-cell 72 may be attached to the PC board and be mounted in aperture 74.
  • Figure 5 shows recessed lamp fixture 40 mounted in a ceiling 76 filled with insulation 77.
  • a differently configured ballast housing 46 is illustrated in Figure 6. It has annular spaced vertical walls 79 and 80 that are connected at their bottom end by an annular disc portion 81. This structure requires a different heat sink trim 56' but otherwise the remainder of its structure is the same as that illustrated in Figure 5.
  • FIG 7 illustrates another heat sink trim 83 having apertures 84 in its horizontal surface for allowing additional cooling of the ballast electrical components.
  • Another heat sink trim 86 is illustrated in Figure 8 and it has a plurality of downwardly extending ridges or webs 88 that give additional surface area for cooling the heat sink trim.
  • Figure 10 illustrates another heat sink trim 90 having an inwardly extending annular flange 91 inside its vertical wall 92.
  • a lens 93 may be supported thereon and/or a baffle 94 may be supported thereon.
  • Figure 11 shows a globe shield 96 having fingers 97 for supporting it from inner annular flange 91.
  • Recessed lamp fixture 100 is an alternative embodiment that would be mounted above an aperture 101 in ceiling 76. It has a horizontal panel 102 that extends across the diameter of the opening. Both the aperture and the panel may have any desired shape or configuration.
  • a pair of mounting rails 104 are secured to the top surface of panel 102 that is made of heat insulating material. The opposite ends of mounting rails 104 may be secured to wooden joist (not shown) that form the framework for ceiling panel 76.
  • Aperture 105 is configured to mate with the outer shape of metal reflector 106. These two structures may be round, rectangular or any other desired shape.
  • a lamp 108 of the discharge type that needs a ballast is threadably received in socket 109 and collar 110 of metal reflector 106 telescopes over the outer surface of socket 109 to form a friction fit.
  • Wires 112 connect between socket 109 and ballast 113.
  • Wires 115 connect ballast 113 to a source, of electrical power.
  • Ballast housing 116 is made of heat insulating material and it may be integrally formed with panel 102. Its bottom wall is open to form an aperture 117. Extending down from the interior of ballast housing 116 may be one or more mounting posts 119 for receiving screws 120 that secure heat sink 121 thereto.
  • Ballast 113 is mounted on heat sink 121 and they are secured together by clips 68 in the same manner as illustrated in Figure 4.
  • ballast housing 116 Since the only opening in ballast housing 116 is the aperture 117 formed by lack of a bottom wall, all of the heat created by the electrical components of ballast 113 can only escape in a downward direction. Heat dissipation is measurably aided by heat sink 121.
  • a trim panel 123 would be mounted to the underside of ceiling 76 and supported thereto by wire bales 124 that pass upwardly through slots 125 in mounting panel 102.
  • Aperture 126 would normally be configured to mate aperture 105.
  • Trim panel 123 may have a pattern of perforations 128 immediately below heat sink 121 to enhance transfer of heat from ballast 113 and its electrical components.
  • a third alternative recessed lamp fixture 130 is illustrated in figure 13. It is mounted above an aperture 131 in ceiling 76.
  • Ballast housing 133 has a pair of diametrically opposed mounting springs 134 whose top ends are rigidly secured in top wall 136 of ballast housing 133. The entire unit is installed by pushing it upwardly through aperture 131 and once there above, the bottom ends of springs 134 expand outwardly and prevent its dropping downwardly through aperture 131.
  • Trim member 138 has a pair of wire bales 139 secured to its top surface and they pass upwardly through slots 141 of ballast housing 133.
  • Reflector 142 has a socket 143 mounted in its top end that receives a lamp 144.
  • a bracket 146 secures reflector 142 and ballast housing 133 together.
  • Bracket 148 is pivotally secured to bracket 146 thereby allowing reflector 142 to be rotated. Pivot pins 149 allow reflector 142 to be pivoted about a horizontal axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

Système d'éclairage destiné à remplacer un éclairage incandescent par l'adaptation alternative de luminaires encastrés à incandescence existants de façon à accepter plus de lampes efficaces, notamment des lampes fluorescentes (26), ou utilisant des luminaires encastrés (40) spécialement conçus à cet effet. Dans les deux cas, l'invention résout le problème de surchauffe des circuits réalisés sur la carte régulateurs de tension, qui apparaît généralement lorsqu'un dispositif d'éclairage encastré conçu pour des lampes à incandescence dispose d'éléments fluorescents de rechange. Plutôt que d'installer le régulateur de tension dans l'armature avec la lampe chaude, les circuits régulateurs de tension sont physiquement retirés de l'intérieur du boîtier de la lampe et isolés à un emplacement distant. Les réalisations préférées placent ces circuits électroniques dans un boîtier (25) de ballast séparé et isolé.
EP97904858A 1997-01-25 1997-01-25 Dispositif d'eclairage Withdrawn EP0954717A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1997/001135 WO1998033009A1 (fr) 1997-01-25 1997-01-25 Dispositif d'eclairage

Publications (2)

Publication Number Publication Date
EP0954717A1 true EP0954717A1 (fr) 1999-11-10
EP0954717A4 EP0954717A4 (fr) 2001-07-18

Family

ID=22260281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97904858A Withdrawn EP0954717A4 (fr) 1997-01-25 1997-01-25 Dispositif d'eclairage

Country Status (2)

Country Link
EP (1) EP0954717A4 (fr)
WO (1) WO1998033009A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19718934A1 (de) * 1997-05-05 1998-11-12 Andreas Toeteberg Leuchtenbasismodul mit besonders rationellen und vielseitigen Ausgestaltungsmerkmalen
ITFI20020114U1 (it) * 2002-12-20 2004-06-21 Targetti Sankey Spa Apparecchio illuminante monouso a sorgente luminosa fluorescente
DE202008004325U1 (de) * 2008-03-29 2009-08-06 W + W Aufzugkomponenten Gmbh U. Co. Kg Leuchte, insbesondere für Aufzugskabinen
US9121590B2 (en) 2011-03-30 2015-09-01 Osram Sylvania, Inc. Partially recessed luminaire
WO2013192499A1 (fr) * 2012-06-22 2013-12-27 Osram Sylvania Inc. Luminaire en évidement partiel
WO2019046618A1 (fr) * 2017-09-01 2019-03-07 Eaton Intelligent Power Limited Garnitures intelligentes pour appareils d'éclairage encastrés

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5597233A (en) * 1992-02-10 1997-01-28 Lau; Kenneth Light fixture

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883732A (en) * 1972-12-04 1975-05-13 David D Peterson Ceiling luminaire
DE8233139U1 (de) * 1982-11-25 1983-05-19 Elektrotechnik-Apparatebau Peter Schmitz, 3200 Hildesheim Leuchte
US4858089A (en) * 1987-12-02 1989-08-15 Eastrock Technology, Inc. Lighting fixture having improved heat dissipation characteristics

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5597233A (en) * 1992-02-10 1997-01-28 Lau; Kenneth Light fixture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9833009A1 *

Also Published As

Publication number Publication date
EP0954717A4 (fr) 2001-07-18
WO1998033009A1 (fr) 1998-07-30

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