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`Ex. 1003
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`EX. 1003
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`LS G0347USP
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`LOW PROFILE LIGHT AND ACCESSORY KIT FOR THE SAME
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`CROSS REFERENCE TO RELATED APPLICATIONS
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`[0001] This application is a continuation—in—part of US. Application Serial No.
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`12/775,310, filed May 6, 2010, which claims the benefit of US. Provisional Application
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`Serial No. 61/248,665, filed October 5, 2009, both of which are incorporated herein by
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`reference in their entirety.
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`BACKGROUND OF THE INVENTION
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`[0002] The present disclosure relates generally to lighting, particularly to low
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`profile lighting, and more particularly to low profile downlighting for retrofit
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`applications.
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`[0003] Light fixtures come in many shapes and sizes, with some being configured
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`for new work installations while others are configured for old work installations. New
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`work installations are not limited to as many constraints as old work installations, which
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`must take into account the type of electrical fixture/enclosure or junction box existing
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`behind a ceiling or wall panel material. With recessed ceiling lighting, sheet metal can—
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`type light fixtures are typically used, while surface—mounted ceiling and wall lighting
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`typically use metal or plastic junction boxes of a variety of sizes and depths. With the
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`advent of LED (light emitting diode) lighting, there is a great need to not only provide
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`new work LED light fixtures, but to also provide LED light fixtures that are suitable for
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`old work applications, thereby enabling retrofit installations. One way of providing old
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`work LED lighting is to configure an LED luminaire in such a manner as to utilize the
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`volume of space available within an existing fixture (can—type fixture or junction box).
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`However, such configurations typically result in unique designs for each type and size of
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`fixture. Accordingly, there is a need in the art for an LED lighting apparatus that
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`overcomes these drawbacks.
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`[0004] This background information is provided to reveal information believed by
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`the applicant to be of possible relevance to the present invention. No admission is
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`necessarily intended, nor should be construed, that any of the preceding information
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`constitutes prior art against the present invention.
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`BRHEF DESCRIPTION OF THE INVENTION
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`[0005] An embodiment of the invention includes a luminaire having a heat
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`spreader and a heat sink thermally coupled to and disposed diametrically outboard of the
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`heat spreader, an outer optic securely retained relative to at least one of the heat spreader
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`and the heat sink, and a light source disposed in thermal communication with the heat
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`spreader, the light source having a plurality of light emitting diodes (LEDs). The heat
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`spreader, the heat sink and the outer optic, in combination, have an overall height H and
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`an overall outside dimension D such that the ratio of H/D is equal to or less than 0.25.
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`The combination defined by the heat spreader, the heat sink and the outer optic, is so
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`dimensioned as to: cover an opening defined by a nominally sized four—inch can light
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`fixture; and, cover an opening defined by a nominally sized four—inch electrical junction
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`box.
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`[0006] An embodiment of the invention includes a luminaire having a heat
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`spreader and a heat sink thermally coupled to and disposed diametrically outboard of the
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`heat spreader. An outer optic is securely retained relative to at least one of the heat
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`spreader and the heat sink. A light source is disposed in thermal communication with the
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`heat spreader, the light source having a plurality of light emitting diodes (LEDs). A
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`power conditioner is disposed in electrical communication with the light source, the
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`power conditioner being configured to receive AC voltage from an electrical supply line
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`and to deliver DC voltage to the plurality of LEDs, the power conditioner being so
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`dimensioned as to fit within at least one of: a nominally sized four—inch can light fixture;
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`and, a nominally sized four—inch electrical junction box.
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`[0007] An embodiment of the invention includes a luminaire having a heat
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`spreader, a heat sink thermally coupled to and disposed diametrically outboard of the heat
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`spreader, an outer optic securely retained relative to at least one of the heat spreader and
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`the heat sink, a light source disposed in thermal communication with the heat spreader,
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`and an electrical supply line disposed in electrical communication with the light source.
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`The heat spreader, heat sink and outer optic, in combination, have an overall height H and
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`an overall outside dimension D such that the ratio of H/D is equal to or less than 0.25.
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`The defined combination is so dimensioned as to: cover an opening defined by a
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`nominally sized four—inch can light fixture; and, cover an opening defined by a nominally
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`sized four—inch electrical junction box.
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`[0008] An embodiment of the invention includes a luminaire having a housing
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`with a light unit and a trim unit. The light unit includes a light source, and the trim unit is
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`mechanically separable from the light unit. A means for mechanically separating the trim
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`unit from the light unit provides a thermal conduction path therebetween. The light unit
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`has sufficient thermal mass to spread heat generated by the light source to the means for
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`mechanically separating, and the trim unit has sufficient thermal mass to serve as a heat
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`sink to dissipate heat generated by the light source.
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`[0009] An embodiment of the invention includes a luminaire for retrofit
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`connection to an installed light fixture having a concealed in—use housing. The luminaire
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`includes a housing having a light unit and a trim unit, the light unit having a light source,
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`and the trim unit being mechanically separable from the light unit. The trim unit defines
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`a heat sinking thermal management element, configured to dissipate heat generated by the
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`light source, that is completely 100% external of the concealed in—use housing of the
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`installed light fixture.
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`[0010] An embodiment of the invention includes a luminaire and accessory kit
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`combination. The luminaire includes a heat spreader; a heat sink; an LED light source; a
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`power supply; an electrical supply line having a first end connected to the power supply,
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`and a second end connected to a plug—in connector; and, an optic securely retained
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`relative to the heat spreader or heat sink. The accessory kit includes a first pre—wired
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`jumper including a pair of insulated electrical wires having a first plug—in connector
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`electrically connected at one end and an Edison base electrically connected at the other
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`end; and/or, a second pre—wired jumper including a pair of insulated electrical wires
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`having a second plug—in connector electrically connected at one end and unconnected
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`wire ends at the other end. The plug—in connector of the first pre—wired jumper and the
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`second pre—wired jumper are each configured to electrically engage with the plug—in
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`connector of the electrical supply line.
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`BRIEF DESCRIPTION OF THE DRAWINGS
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`[0011] Referring to the exemplary drawings wherein like elements are numbered
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`alike in the accompanying Figures, abbreviated in each illustration as “Fig.”:
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`[0012] Figure 1 depicts an isometric top view of a luminaire in accordance with
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`an embodiment of the invention;
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`[0013] Figure 2 depicts a top view of the luminaire of Figure 1;
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`[0014] Figure 2 depicts a bottom view of the luminaire of Figure 1;
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`[0015] Figure 4 depicts a side view of the luminaire of Figure 1;
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`[0016] Figure 5 depicts a top view of a heat spreader assembly, a heat sink, and an
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`outer optic in accordance with an embodiment of the invention;
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`[0017] Figure 6 depicts an isometric view of the heat spreader of Figure 5;
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`[0018] Figure 7 depicts a partial isometric view of the heat sink of Figure 5;
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`[0019] Figure 8 depicts a top view of an alternative heat spreader assembly in
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`accordance with an embodiment of the invention;
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`[0020] Figure 9 depicts a top view of another alternative heat spreader assembly
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`in accordance with an embodiment of the invention;
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`[0021] Figure 10 depicts a top view of yet another alternative heat spreader
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`assembly in accordance with an embodiment of the invention;
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`[0022] Figure 11 depicts a bottom view of a heat spreader having a power
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`conditioner in accordance with an embodiment of the invention;
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`[0023] Figure 12 depicts a section view of a luminaire in accordance with an
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`embodiment of the invention;
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`[0024] Figure 13 depicts a bottom view of a heat sink having recesses in
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`accordance with an embodiment of the invention;
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`[0025] Figures 14—18 depict isometric views of existing electrical can—type light
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`fixtures and electrical junction boxes for use in accordance with an embodiment of the
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`invention;
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`[0026] Figures 19—21 depict a side view, top view and bottom view, respectively,
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`of a luminaire similar but alternative to that of Figures 2—4, in accordance with an
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`embodiment of the invention;
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`[0027] Figures 22—23 depict top and bottom views, respectively, of a heat spreader
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`having an alternative power conditioner in accordance with an embodiment of the
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`invention;
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`[0028] Figure 24—26 depict in isometric, top and side views, respectively, an
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`alternative reflector to that depicted in Figures 10 and 12;
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`[0029] Figure 27 depicts an exploded assembly view of an alternative luminaire in
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`accordance with an embodiment of the invention;
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`[0030] Figure 28 depicts a side view of the luminaire of Figure 27;
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`[0031] Figure 29 depicts a back view of the luminaire of Figure 27;
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`[0032] Figure 30 depicts a cross section view of the luminaire of Figure 27, and
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`more particularly depicts a cross section view of the outer optic used in accordance with
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`an embodiment of the invention;
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`[0033] Figure 31 depicts an accessory kit in accordance with an embodiment of
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`the invention;
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`[0034] Figure 32 depicts a formed spring included in the accessory kit of Figure
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`31;
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`[0035] Figure 33 depicts a top—down view of a luminaire similar to that depicted
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`in Figure 27, and illustrative of an assembly of a formed spring of Figure 32 onto the
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`luminaire;
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`[0036] Figure 34 depicts a side view of the luminaire of Figure 33;
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`[0037] Figure 35 depicts an exploded assembly view of the luminaire of Figures
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`33 and 34;
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`[0038] Figures 36A and 36B are side view depictions of a first position (not
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`engaged) and a second position (engaged), respectively, of an engagement tab of an optic
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`snap—fitting into an engagement opening of a base, where both the optic and the base are
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`part of the luminaire of Figure 35; and
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`[0039] Figures 37A and 37B are plan view depictions of an alternative
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`arrangement to that depicted in Figures 36A and 36B, respectively, and more specifically
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`are depictions of a first position (not engaged) and a second position (engaged),
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`respectively, of an engagement tab of an optic rotationally—fitting into an engagement
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`opening of a base, where both the optic and the base are part of the luminaire of Figure
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`35.
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`DETAILED DESCRIPTION OF THE INVENTION
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`[0040] Although the following detailed description contains many specifics for
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`the purposes of illustration, anyone of ordinary skill in the art will appreciate that many
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`variations and alterations to the following details are within the scope of the invention.
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`Accordingly, the following preferred embodiments of the invention are set forth without
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`any loss of generality to, and without imposing limitations upon, the claimed invention.
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`[0041] An embodiment of the invention, as shown and described by the various
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`figures and accompanying text, provides a low profile downlight, more generally referred
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`to as a luminaire, having an LED light source disposed on a heat spreader, which in turn
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`is thermally coupled to a heat sink that also serves as the trim plate of the luminaire. The
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`luminaire is configured and dimensioned for retrofit installation on standard can—type
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`light fixtures used for recessed ceiling lighting, and on standard ceiling or wall junction
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`boxes (J —boxes) used for ceiling or wall mounted lighting. The luminaire is also suitable
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`for new work installation. Retrofit installation of the luminaire is accomplished utilizing
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`an accessory kit that includes a pre—wired electrical jumper and mounting hardware. For
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`installations involving a can—type fixture, the pre—wired jumper includes a plug—in
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`connector electrically connected to an Edison base via flexible insulated wires For
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`installations involving a J —box, the pre—wired jumper includes a plug—in connector
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`electrically connected to flexible insulated wires that may or may not be pre— stripped, or
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`partially pre—stripped, on the opposing end.
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`[0042] While embodiments of the invention described and illustrated herein
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`depict an example luminaire for use as a downlight when disposed upon a ceiling, it will
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`be appreciated that embodiments of the invention also encompass other lighting
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`applications, such as a wall sconce for example.
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`[0043] While embodiments of the invention described and illustrated herein
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`depict example power conditioners having visually defined sizes, it will be appreciated
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`that embodiments of the invention also encompass other power conditioners having other
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`sizes as long as the power conditioners fall within the ambit of the invention disclosed
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`herein.
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`[0044] Referring to Figures 1—26 collectively, a luminaire 100 includes a heat
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`spreader 105, a heat sink 110 thermally coupled to and disposed diametrically outboard of
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`the heat spreader, an outer optic 115 securely retained relative to at least one of the heat
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`spreader 105 and the heat sink 110, a light source 120 disposed in thermal
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`communication with the heat spreader 105, and an electrical supply line 125 disposed in
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`electrical communication with the light source 120. To provide for a low profile
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`luminaire 100, the combination of the heat spreader 105, heat sink 110 and outer optic
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`115, have an overall height H and an overall outside dimension D such that the ratio of
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`H/D is equal to or less than 0.25. In an example embodiment, height H is 1.5—inches, and
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`outside dimension D is a diameter of 7—inches. Other dimensions for H and D are
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`contemplated such that the combination of the heat spreader 105, heat sink 110 and outer
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`optic 115 , are configured and sized so as to; (i) cover an opening defined by an industry
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`standard can—type light fixture having nominal sizes from three—inches to six—inches, such
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`as a four—inch can or a six—inch can for example (see Figures 14 and 15 for example); and,
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`(ii) cover an opening defined by an industry standard electrical junction box having
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`nominal sizes from three—inches to six—inches, such as a four—inch J —box or a six—inch J —
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`box for example (see Figures 16 and 17 for example). Since can—type light fixtures and
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`ceiling/wall mount junction boxes are designed for placement behind a ceiling or wall
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`material, an example luminaire has the back surface of the heat spreader 105 substantially
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`planar with the back surface of the heat sink 110, thereby permitting the luminaire 100 to
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`sit substantially flush on the surface of the ceiling/wall material. Alternatively, small
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`standoffs 200 (see Figure 12 for example) may be used to promote air movement around
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`the luminaire 100 for improved heat transfer to ambient air, which will be discussed
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`further below. Securement of the luminaire 100 to a junction box may be accomplished
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`by using suitable fasteners through appropriately spaced holes 150 (see Figure 8 for
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`example), and securement of the luminaire 100 to a can—type fixture may be accomplished
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`by using extension springs 205 fastened at one end to the heat spreader 105 (see Figure 12
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`for example) and then hooked at the other end onto an interior detail of the can—type
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`fixture.
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`[0045] In an embodiment, the light source 120 includes a plurality of light
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`emitting diodes (LEDs) (also herein referred to as an LED chip package), which is
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`represented by the “checkered box” in Figures 5, 6 and 8—10. In application, the LED
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`chip package generates heat at the junction of each LED die. To dissipate this heat, the
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`LED chip package is disposed in suitable thermal communication with the heat spreader
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`105, which in an embodiment is made using aluminum, and the heat spreader is disposed
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`in suitable thermal communication with the heat sink 110, which in an embodiment is
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`also made using aluminum. To provide for suitable heat transfer from the heat spreader
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`105 to the heat sink 110, an embodiment employs a plurality of interconnecting threads
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`130, 135, which when tightened provide suitable surface area for heat transfer
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`thereacro s s .
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`[0046] Embodiments of luminaire 100 may be powered by DC voltage, while
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`other embodiments may be powered by AC voltage. In a DC—powered embodiment, the
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`electrical supply lines 125, which receive DC voltage from a DC supply, are directly
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`connected to the plurality of LEDs 120. Holes 210 (see Figure 9 for example) in the heat
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`spreader 105 permit passage of the supply lines 125 from the back side of the heat
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`spreader 105 to the front side. In an AC—powered embodiment, a suitable power
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`conditioner 140, 160, 165 (see Figures 8, 9 and 11 for example) is used.
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`[0047] In an embodiment, and with reference to Figure 8, power conditioner 140
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`is disposed on the heat spreader 105 on a same side of the heat spreader as the plurality of
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`LEDs 120. In an embodiment, the power conditioner 140 is an electronic circuit board
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`having electronic components configured to receive AC voltage from the electrical supply
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`line 125 and to deliver DC voltage to the plurality of LEDs through appropriate electrical
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`connections on either the front side or the back side of the heat spreader 105, with holes
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`through the heat spreader or insulated electrical traces across the surface of the heat
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`spreader being used as appropriate for the purposes.
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`[0048] In an alternative embodiment, and with reference to Figure 9, an arc—
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`shaped electronic—circuit—board—mounted power conditioner 160 may be used in place of
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`the localized power conditioner 140 illustrated in Figure 8, thereby utilizing a larger
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`available area of the heat spreader 105 without detracting from the lighting efficiency of
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`luminaire 100.
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`[0049] In a further embodiment, and with reference to Figure 11, a block—type
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`power conditioner 165 (electronics contained within a housing) may be used on the back
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`surface of the heat spreader 105, where the block—type power conditioner 165 is
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`configured and sized to fit within the interior space of an industry—standard nominally
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`sized can—type light fixture or an industry—standard nominally sized wall/ceiling junction
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`box. Electrical connections between the power conditioner 165 and the LEDs 120 are
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`made via wires 170, which may be contained within the can fixture or junction box, or
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`may be self—contained within the power conditioner housing. Electrical wires 175 receive
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`AC voltage via electrical connections within the can fixture or junction box.
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`[0050] Referring now to Figures 8—10 and 12, an embodiment includes a reflector
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`145 disposed on the heat spreader 105 so as to cover the power conditioner 140, 160,
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`while permitting the plurality of LEDs 120 to be visible (i.e., uncovered) through an
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`aperture 215 of the reflector 145. Mounting holes 155 in the reflector 145 align with
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`mounting holes 150 in the heat spreader 105 for the purpose discussed above. The
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`reflector 145 provides a reflective covering that hides power conditioner 140, 160 from
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`view when viewed from the outer optic side of luminaire 100, while efficiently reflecting
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`light from the LEDs 120 toward the outer optic 115. Figure 12 illustrates a section view
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`through luminaire 100, showing a stepped configuration of the reflector 145, with the
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`power conditioner 140, 160 hidden inside a pocket (i.e., between the reflector 145 and the
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`heat spreader 105), and with the LEDs 120 visible through the aperture 215. In an
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`embodiment, the outer optic is made using a glass—bead—impregnated—plastic material. In
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`an embodiment the outer optic 115 is made of a suitable material to mask the presence of
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`a pixilated light source 120 disposed at the center of the luminaire. In an embodiment,
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`the half angle power of the luminaire, where the light intensity of the light source when
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`viewed at the outer optic drops to 50% of its maximum intensity, is evident within a
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`central diameter of the outer optic that is equal to or greater than 50% of the outer
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`diameter of the outer optic.
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`[0051] While Figure 10 includes a reflector 145, it will be appreciated that not all
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`embodiments of the invention disclosed herein may employ a reflector 145, and that when
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`a reflector 145 is employed it may be used for certain optical preferences or to mask the
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`electronics of the power conditioner 140, 160. The reflective surface of the reflector 145
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`may be white, reflective polished metal, or metal film over plastic, for example, and may
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`have surface detail for certain optical effects, such as color mixing or controlling light
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`distribution and/or focusing for example.
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`[0052] Referring to Figure 12, an embodiment includes an inner optic 180
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`disposed over the plurality of LEDs 120. Employing an inner optic 180 not only provides
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`protection to the LEDs 120 during installation of the luminaire 100 to a can fixture or
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`junction box, but also offers another means of color—mixing and/or diffusing and/or color—
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`temperature—adjusting the light output from the LEDs 120. In alternative embodiments,
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`the inner optic 180 may be a standalone element, or integrally formed with the reflector
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`145. In an embodiment, the LEDs 120 are encapsulated in a phosphor of a type suitable
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`to produce a color temperature output of 2700 deg—Kelvin. Other LEDs with or without
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`phosphor encapsulation may be used to produce other color temperatures as desired.
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`[0053] Referring to Figure 13, a back surface 185 of an embodiment of the heat
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`sink 110 includes a first plurality of recesses 190 oriented in a first direction, and a
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`second plurality of recesses 195 oriented in a second opposing direction, each recess of
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`the first plurality and the second plurality having a shape that promotes localized air
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`movement within the respective recess due at least in part to localized air temperature
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`gradients and resulting localized air pressure gradients. Without being held to any
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`particular theory, it is contemplated that a teardrop—shaped recess 190, 195 each having a
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`narrow end and an opposing broad end will generate localized air temperatures in the
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`narrow end that are higher than localized air temperatures in the associated broad end,
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`due to the difference of proximity of the surrounding “heated” walls of the associated
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`recess. It is contemplated that the presence of such air temperature gradients, with
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`resulting air pressure gradients, within a given recess 190, 195 will cause localized air
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`movement within the associated recess, which in turn will enhance the overall heat
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`transfer of the thermal system (the thermal system being the luminaire 100 as a whole).
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`By alternating the orientation of the recesses 190, 195, such that the first plurality of
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`recesses 190 and the second plurality of recesses 195 are disposed in an alternating
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`fashion around the circumference of the back 185 of the heat sink 110, it is contemplated
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`that further enhancements in heat transfer will be achieved, either by the packing density
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`of recesses achievable by nesting one recess 190 adjacent the other 195, or by alternating
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`the direction vectors of the localized air temperature/pressure gradients to enhance overall
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`air movement. In an embodiment, the first plurality of recesses 190 have a first depth
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`into the back surface of the heat sink, and the second plurality of recesses 195 have a
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`second depth into the back surface of the heat sink, the first depth being different from the
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`second depth, which is contemplated to further enhance heat transfer.
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`[0054] Figures 14—18 illustrate typical industry standard can—type light fixtures for
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`recessed lighting (Figures 14—15), and typical industry standard electrical junction boxes
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`for ceiling or wall mounted lighting (Figures 16—18). Embodiments of the invention are
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`configured and sized for use with such fixtures of Figures 14—18.
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`[0055] Figures 19—21 illustrate an alternative luminaire 100’ having a different
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`form factor (flat top, flat outer optic, smaller appearance) as compared to luminaire 100
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`of Figures 1—4.
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`[0056] Figures 22—23 illustrate alternative electronic power conditioners 140’,
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`165’ having a different form factor as compared to power conditioners 140, 165 of
`
`Figures 8 and 11, respectively. All alternative embodiments disclosed herein, either
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`explicitly, implicitly or equivalently, are considered within the scope of the invention.
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`[0057] Figures 24—26 illustrate an alternative reflector 145’ to that illustrated in
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`Figures 10 and 12, with Figure 24 depicting an isometric view, Figure 25 depicting a top
`
`view, and Figure 26 depicting a side view of alternative reflector 145’. As illustrated,
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`reflector 145’ is conically—shaped with a centrally disposed aperture 215’ for receiving the
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`LED package 120. The cone of reflector 145’ has a shallow form factor so as to fit in the
`
`low profile luminaire 100, 100’. Similar to reflector 145, the reflective surface of the
`
`reflector 145’ may be white, reflective polished metal, or metal film over plastic, for
`
`example, and may have surface detail for certain optical effects, such as color mixing or
`
`controlling light distribution and/or focusing for example. As discussed herein with
`
`respect to reflector 145 , alternative reflector 145’ may or may not be employed as
`
`required to obtain the desired optical effects.
`
`[0058] From the foregoing, it will be appreciated that embodiments of the
`
`invention also include a luminaire 100 with a housing ( collectively referred to by
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`reference numerals 105, 110 and 115) having a light unit (collectively referred to by
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`reference numerals 105 and 115 ) and a trim unit 110, the light unit including a light
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`source 120, the trim unit being mechanically separable from the light unit, a means for
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`mechanically separating 130, 135 the trim unit from the light unit providing a thermal
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`conduction path therebetween, the light unit having sufficient thermal mass to spread heat
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`generated by the light source to the means for mechanically separating, the trim unit
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`having sufficient thermal mass to serve as a heat sink to dissipate heat generated by the
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`light source.
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`[0059] From the foregoing, it will also be appreciated that embodiments of the
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`invention further include a luminaire 100 for retrofit connection to an installed light
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`14 of 27
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`Satco's Ex. 1003, Page 14
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`Satco's Ex. 1003, Page 14
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`fixture having a concealed in—use housing (see Figures 14—18 for example), the luminaire
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`including a housing 105, 110, 115 having a light unit 105, 115 and a trim unit 110, the
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`light unit comprising a light source 120, the trim unit being mechanically separable from
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`the light unit, the trim unit defining a heat sinking thermal management element
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`configured to dissipate heat generated by the light source that is completely 100%
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`external of the concealed in—use housing of the installed light fixture. As used herein, the
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`term “concealed in—use housing” refers to a housing that is hidden behind a ceiling or a
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`wall panel once the luminaire of the invention has been installed thereon.
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`[0060] Reference is now made to Figure 27, which depicts an exploded assembly
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`view of an alternative luminaire 300 to that depicted in Figures 1—12. Similar to
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`luminaire 100 (where like elements are numbered alike, and similar elements are named
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`alike but numbered differently), luminaire 300 includes a heat spreader 305 integrally
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`formed with a heat sink 310 disposed diametrically outboard of the heat spreader 305 (the
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`heat spreader 305 and heat sink 310 are collectively herein referred to as base 302), an
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`outer optic 315 securely retained relative to at least one of the heat spreader 305 and the
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`heat sink 310, a light source (LED) 120 disposed in thermal communication with the heat
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`spreader 305, and an electrical supply line 125 disposed in electrical communication with
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`the light source 120. The integrally formed heat spreader 305 and heat sink 310 provides
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`for improved heat flow from the LED 120 to the heat sink 310 as the heat flow path
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`therebetween is continuous and uninterrupted as compared to the luminaire 100 discussed
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`above.
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`[0061] To provide for a low profile luminaire 300, the combination of the heat
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`spreader 305, heat sink 310 and outer optic 315, have an overall height H and an overall
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`outside dimension D such that the ratio of H/D is equal to or less than 0.25 (best seen by
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`reference to Figure 28). In an example embodiment, height H is 1.5—inches, and outside
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`dimension D is a diameter of 7—inches. Other dimensions for H and D are contemplated
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`such that the combination of the heat spreader 305, heat sink 310 and outer optic 315, are
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`so configured and dimensioned as to; (i) cover an opening defined by an industry standard
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`15 of27
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`Satco's Ex. 1003, Page 15
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`Satco's Ex. 1003, Page 15
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`can—type light fixture having nominal sizes from three—inches to six—inches, such as a
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`four—inch can or a six—inch can for example (see Figures 14 and 15 for example); and, (ii)
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`cover an opening defined by an industry standard electrical junction box having nominal
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`sizes from three—inches to six—inches, such as a four—inch J —box or a six—inch J —box for
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`example (see Figures 16 and 17 for example). Since can—type light fixtures and
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`ceiling/wall mount junction boxes are designed for placement behind a ceiling or wall
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`material, an example luminaire 300 has the back surface of the heat spreader 305
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`substantially planar with the back surface of the heat sink 310, thereby permitting the
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`luminaire 300 to sit substantially flush on the surface of the ceiling/wall material.
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`Alternatively, small standoffs 200 (see Figure 12 in combination with Figure 27 for
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`example) may be used to promote air movement around the luminaire 300 for improved
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`heat transfer to ambient, as discussed above.
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`[0062] Securement of the luminaire 300 to a junction box (see Figures 16—18 for
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`example) may be accomplished by using a bracket 400 and suitable fasteners 405 (four
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`illustrated) through appropriately spaced holes 410 (four illustrated) in the bracket 400.
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`Securement of the base 302 to the bracket 400 is accomplished using suitable fasteners
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`415 (two illustrated) through appropriately spaced holes 420 (two used, diametrically
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`opposing each other, but only one visible) in the base 302, and threaded holes 425 (two
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`illustrated) in the bracket 400. Securement of the optic 315 to the base 302 is
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`accomplished using suitable fasteners 430 (three illustrated) through appropriately spaced
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`holes 435 (three used, spaced 120 degrees apart, but only two illustrated) in tabs 445 of
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`the optic 315, and threaded holes 440 (three used, spaced 120 degrees apart, but only two
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`illustrated) in the base 302. A trim ring 470 circumferentially snap—fits over the optic 315
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`to hide the retaining fasteners 430, the holes 435 and the tabs 445. The snap—fit
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`arrangement of the trim ring 470 relative to the optic 315 is such that the trim ring 470
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`can be removed in a pop—off manner for maintenance or other purposes. In an
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`embodiment, securement of the optic 315 to the base 302 is accomplished using an insert—
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`and—rotate action, where legs are integrally formed with, or molded onto, the optic 315