CA2720313A1

CA2720313A1 - Led light fixture

Info

Publication number: CA2720313A1
Application number: CA2720313A
Authority: CA
Inventors: Brian Kinnune; Alan J. Ruud; Wayne P. Guillien; Don Miletich; Kurt S. Wilcox; Russell Schultz
Original assignee: Ruud Lighting Inc
Current assignee: Cree Lighting USA LLC
Priority date: 2008-04-04
Filing date: 2009-04-03
Publication date: 2009-10-08
Anticipated expiration: 2029-04-03
Also published as: AU2009232343A1; US20140078740A1; US9255705B2; WO2009123752A9; US9261271B2; EP2265464A1; AU2009232343B2; EP2265464B1; CN104279476B; US20130077311A1; WO2009123752A1; US20150241050A1; EP2265464A4; CN104279476A; CA2720313C; KR20110002468A; BRPI0910962B1; US20150252999A1; CN102046421B; BRPI0910962A2

Abstract

An LED floodlight fixture (100) includes a housing (10) that has at least one end-portion (12), a single-piece extrusion ( 20) including (i) a base (22) having an LED-adjacent surface (220) and an opposite surface (221) and (ii) a heat-dissipating section (24) having heat-dissipating surfaces (241) extending from the opposite surface, and an LED arrangement (30) mounted to the LED-adjacent surface in non-water/air-tight condition with respect to the housing. The housing preferably forms at least one venting gap (14) to provide cool-air (3) ingress to and along the heat-dissipating surfaces by upward flow of heated air (5) therefrom. Additionally and/or alternatively, the base of the single-piece extrusion has one or more venting apertures (28) to provide cool-air ingress for such purpose. One aspect of the invention involves the heat-dissipating section of the extrusion including a wireway (26) therealong enclosing wires extending to/from electrical component(s).

Description

2 PCT/US2009/002100 LED LIGHT FIXTURE

FIELD OF THE INVENTION
This invention relates to light fixtures and, more particularly, to street and roadway light fixtures and the like, including light fixtures for illumination of large areas. More particularly, this invention relates to such light fixtures which utilize LEDs as light source.

BACKGROUND OF THE INVENTION
In recent years, the use of light-emitting diodes (LEDs) for various common lighting purposes has increased, and this trend has accelerated as advances have been made in LEDs and in LED-array bearing devices, often referred to as "LED
modules."
Indeed, lighting applications which have been served by fixtures using high-intensity discharge (HID) lamps and other light sources are now increasingly beginning to be served by LED modules. Such lighting applications include, among a good many others, roadway lighting, parking lot lighting and factory lighting. Creative work continues in the field of LED module development, and also in the field of using LED
modules for light fixtures in various applications. It is the latter field to which this invention relates.
High-luminance light fixtures using LED modules as light source for roadway and similar applications present particularly challenging problems. High costs due to high complexity becomes a particularly difficult problem when high luminance, reliability, and durability are essential to product success. Keeping electronic LED
drivers in a water/air-tight location may also be problematic, particularly when, as with roadway lights and the like, the light fixtures are constantly exposed to the elements and many LED modules are used.
Yet another cost-related challenge is the problem of achieving a high level of adaptability in order to meet a wide variety of different luminance requirements. That is, providing a fixture which can be adapted to give significantly greater or lesser amounts of luminance as deemed appropriate for particular applications is a difficult problem. Light-fixture adaptability is an important goal for LED light fixtures.

Dealing with heat dissipation requirements is still another problem area for high-luminance LED light fixtures. Heat dissipation is difficult in part because high-luminance LED light fixtures typically have a great many LEDs and several LED
modules. Complex structures for module mounting and heat dissipation have sometimes been deemed necessary, and all of this adds to complexity and cost.
In short, there is a significant need in the lighting industry for improved roadway light fixtures and the like using LEDs. There is a need for fixtures that are adaptable for a wide variety of lighting situations, and that satisfy the problems associated with heat dissipation and appropriate protection of electronic LED
driver components. Finally, there is a need for an improved LED-module-based light which is simple, and is easy and inexpensive to manufacture.

OBJECTS OF THE INVENTION
It is an object of the invention to provide an improved LED light fixture that overcomes some of the problems and shortcomings of the prior art, including those referred to above.
Another object of the invention is to provide an improved LED light fixture that reduces development and manufacturing costs for LED light for applications requiring widely different luminance levels.
Another object of the invention is to provide an improved high-luminance LED light fixture with excellent reliability and durability, despite use in difficult outdoor environments.
Still another object of the invention is to provide an improved LED light fixture achieving excellent heat dissipation yet involving minimal structural complexity.

How these and other objects are accomplished will become apparent from the following descriptions and the drawings.

SUMMARY OF THE INVENTION
The present invention is an improvement in LED light fixtures, particularly for street and roadway lights and the like.

The inventive LED light fixture includes a housing that itself includes at least one end-portion and a single-piece extrusion secured with respect to the end-portion.
The single-piece extrusion, which preferably is of aluminum or a similar metal or metal alloy, includes a base having an LED-adjacent surface, an opposite surface and a heat-dissipating section having heat-dissipating surfaces extending from the opposite surface. The inventive light fixture further includes an LED
arrangement mounted to the LED-adjacent surface in non-water/air-tight condition with respect to the housing.
In a highly preferred embodiment of the inventive light fixture, the housing forms at least one venting gap between the at least one end-portion and the single-piece extrusion to provide cool-air ingress to and along the heat-dissipating surfaces by upward flow of heated air therefrom.
In some preferred embodiments the at least one end-portion includes a first end-portion which preferably forms a water/air-tight chamber enclosing at least one electronic LED driver and/or other electronics needed for LEDs. Highly preferred embodiments of the invention include a second end-portion. The single-piece extrusion includes first and second ends with the first and second end-portions secured with respect to the first and second ends, respectively, of the extrusion. Such embodiments preferably include a venting gap between each end-portion and the single-piece extrusion. In such embodiments, the second end-portion forms an endcap.

The first end-portion at the first end of the extrusion has a lower surface and an extrusion-adjacent end surface. In highly preferred embodiments of the inventive LED light fixture, the extrusion-adjacent end surface and the lower surface form a first recess extending away from the first end of the extrusion and defining a first venting gap. The end surface along the first recess is preferably tapered such that the first venting gap is upwardly narrowed, thereby to direct and accelerate the air flow along the heat-dissipating surfaces.

In such highly preferred embodiments of the invention, the endcap at the second end of the extrusion has an inner surface and a lower edge-portion. It is further highly preferred that the inner surface and the lower edge-portion of the

-3-endcap form a second recess extending away from the second end of the extrusion and defining a second venting gap. The inner surface along the second recess is preferably tapered such that the second venting gap is upwardly narrowed, thereby to direct and accelerate the air flow along the heat-dissipating surfaces.
In preferred embodiments of this invention, the LED arrangement includes at least one LED-array module. The LED arrangement most preferably includes a plurality of LED-array modules. The LED-array modules are preferably substantially rectangular elongate modules. Examples of LED-array modules are disclosed in co-pending United States patent application Serial No. 11/774,422, the contents of which are incorporated herein by reference.
In preferred embodiments, the LED-array modules each have a common module-width, and the LED-adjacent surface of the base of the extrusion preferably has a width which is approximately the multiple of the maximum number of LED-array modules mountable in side-by-side relationship thereon by the common module-width. For example, if the maximum number of such modules side-by-side of the LED adjacent surface is three, the width of the LED-adjacent surface is about three times the module-width.
The LED-array modules further have predetermined module-lengths preferably associated with the numbers of LEDs on the modules. In other words, if a module has 20 LED thereon it will have one predetermined module-length, and if it has 10 LEDs thereon it will have a shorter predetermined module-length. It is preferred that the LED-adjacent surface has a length which is preferably approximately a dimension selected from the predetermined module-lengths and the sum(s) of the module-lengths of pairs of the LED-array modules. In some of the highly preferred embodiments, at least one of the plurality of modules has a module-length different than the module-length of at least another of the plurality of modules. The LED-adjacent surface is preferably selected to have a dimension that approximately corresponds to a length of the LED arrangement.
The light fixture of this invention and its single-piece extrusion can easily be adapted in a wide variety of ways to satisfy a great variety of luminance requirements.

-4-In certain of the preferred embodiments, the plurality of LED-array modules includes LED-array modules in end-to-end relationship to one another. Such modules include modules proximal to the first end-portion and modules distal from the first end-portion. The first end-portion has water/air-tight wire-access(es) receiving wires from the proximal module(s).
In certain highly preferred embodiments, the extrusion includes water/air-tight wireway(s) receiving wires from the distal LED-array module(s), such that wires from the distal modules reach the water/air-tight chamber of the first end-portion through the wireway(s). The wireway(s) preferably extend along the heat-dissipating section.

The heat-dissipating section preferably includes parallel fins along the lengths of the single-piece extrusion. The closed wireway(s) are preferably formed along the fin(s).
In highly preferred embodiments in which the LED arrangement includes a plurality of LED-array modules, it is highly preferred that the base of the single-piece extrusion have at least one venting aperture therethrough to provide cool-air ingress to and along the heat-dissipating surfaces by upward flow of heated air therefrom.
The venting apertures preferably include at least one elongate aperture across at least a majority of the width of the base. It is preferred that a deflector member be secured to the base along the elongate aperture. The deflector member has at least one beveled deflector surface oriented to direct and accelerate air flow along the heat-dissipating surfaces. In some preferred embodiments, the deflector member includes a pair of oppositely-facing beveled deflector surfaces oriented to direct and accelerate air flow in opposite directions along the heat-dissipating surfaces - i.e., along heat-dissipating surface above the different modules.

In some of such embodiments, the plurality of LED-array modules preferably include LED-array modules in lengthwise relationship to one another. The venting aperture(s) include at least one aperture distal from (i.e., away from) the first and second ends of the extrusion - an aperture in a more or less middle position.

In some of such embodiments, the plurality of LED-array modules further includes at least one (and preferably two or more) proximal LED-array module(s) proximal to the first end of the extrusion and at least one (and preferably two or more) distal LED-array module(s) distal from the first end of the extrusion, the distal LED-

-5-array module(s) being spaced from the proximal LED-array module(s). The venting aperture(s) distal from the first and second ends of the extrusion are preferably at the space between the proximal and distal LED-array modules.
In the highly preferred embodiments just described, the LED-adjacent surface has a length which is approximately a dimension that is (a) the sum of the module-lengths of pairs of the end-to-end LED-array modules plus (b) the length of the space between the proximal and distal LED-array modules. Most preferably, in such embodiments the LED-adjacent surface further has a width which is approximately the multiple of the maximum number of LED-array modules mountable in side-by-side relationship thereon by the common module-width.
In describing LED-array modules herein which are of generally rectangular configuration, the term "end" refers to the two opposite edges having the shortest dimension of such rectangular configuration, and the term "side" refers to the other two opposite edges, which typically have the longest dimension of such rectangular configuration (although a rectangular configuration which is square would, of course, have four edges of equal dimension).
The term "common module-width," as used herein with reference to rectangular LED-array modules, means that each of the LED-array modules mounted to the LED-adjacent surface has substantially the same width as the other modules.
The term "widthwise,"as used with respect to the mounting relationship of rectangular LED-array modules, means that each of such modules is positioned in a sideways direction from the other module(s), with or without space therebetween.

The term "side-by-side," as used with respect to the mounting relationship of rectangular LED-array modules, refers to a widthwise mounting relationship in which the modules are positioned with their sides substantially immediately adjacent to one another, regardless of whether they are in full-length side-by-side relationship.

The term "full-length side-by-side," as used herein with respect to the mounting relationship of LED-array modules, refers to a widthwise, side-by-side mounting relationship in which the full length of a module is positioned adjacent to the full length(s) of the other module(s).

-6-The term "lengthwise,"as used with respect to the mounting relationship of rectangular LED-array modules, means that each of such modules is positioned in an endwise direction from the other module(s), with or without space therebetween.

The term "end-to-end," as used with respect to the mounting relationship of rectangular LED-array modules, refers to an endwise mounting relationship in which the modules are positioned with their ends substantially immediately adjacent to one another, regardless of whether they are in full-width end-to-end relationship.
The term "full-width end-to-end," as used herein with respect to the mounting relationship of LED-array modules, refers to an endwise, end-to-end mounting relationship in which the full width of a module is positioned adjacent to the full width(s) of the other module(s).

BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a perspective view from below of one embodiment of an LED
light fixture in accordance with this invention including LED-array modules with ten LEDs thereon.
FIGURE 2 is a perspective view from above of the LED light fixture of FIGURE 1.
FIGURE 3 is a perspective view from below of another embodiment of LED
light fixture including LED-array modules with twenty LEDs thereon..
FIGURE 4 is a perspective view from above of the LED light fixture of FIGURE 3.
FIGURE 5 is a widthwise cross-sectional view of the LED light fixture across the single-piece extrusion showing one configuration of the extrusion.
FIGURE 6 is a widthwise cross-sectional view of the LED light fixture across the single-piece extrusion showing another configuration of the extrusion.
FIGURE 7 is a fragmentary lengthwise cross-sectional view of the LED light fixture of FIGURE 1 taken along lines 7-7.
FIGURES 8-10 are heat-dissipation diagrams showing air-flow through the LED light fixture.

-7-FIGURE 11 is a perspective view from below of the LED light fixture of FIGURE 1 shown with a lower portion in open position.
FIGURE 12 is a bottom plan view of the LED light fixture of FIGURE 1.
FIGURE 13 is a bottom plan view of the LED light fixture of FIGURE 12 with an LED arrangement including two side-by-side LED-array modules.
FIGURE 14 is a bottom plan view of the LED light fixture of FIGURE 3.
FIGURE 15 is a bottom plan view of the LED light fixture of FIGURE 14 with an LED arrangement including two side-by-side LED-array modules.
FIGURE 16 is a bottom plan view of the LED light fixture of FIGURE 14 with an LED arrangement including side-by-side LED-array modules having different lengths.
FIGURE 17 is a bottom plan view of an embodiment of the LED light fixture with LED-array modules mounted in end-to-end relationship to one another.
FIGURE 18-20 are bottom plan views of embodiment of the LED light fixture of FIGURE 17 with same-length LED-array modules mounted in end-to-end relationship to one another showing alternative arrangements of the LED-array modules.
FIGURES 21 and 22 are bottom plan views of yet more embodiments of the LED light fixture of FIGURE 17 showing an LED arrangement with a combination of same-length and different-length LED-array modules in end-to-end relationship to one another.

FIGURE 23 is a bottom plan view of still another embodiment of the LED
light fixture with different-length LED-array modules mounted in end-to-end relationship to one another.
FIGURE 24-26 are bottom plan views of alternative embodiments of the LED
light fixture of FIGURE 23 with showing alternative arrangements of such LED-array modules.

FIGURE 27 is fragmentary lengthwise cross-sectional view of the LED light fixture of FIGURE 17 taken along lines 27-27 to show a closed wireway formed of and along the extrusion.

-8-FIGURE 28 is a bottom plan view of an embodiment of the LED light fixture which has a venting aperture through a base of the extrusion.
FIGURE 29 is a bottom plan view of another embodiment of the LED light fixture as in FIGURE 28 but for alternative arrangement of LED modules.
FIGURE 30 is a fragmentary lengthwise cross-sectional view of the LED light fixture of FIGURE 28 taken along lines 30-30.
FIGURE 31 is a fragmentary perspective view from below of the LED light fixture of FIGURE 28 showing a deflector member within the venting aperture.
FIGURE 32 is a top plan view of the embodiment of the LED light fixture of FIGURE 28.

FIGURE 33 is a perspective view from below of an upper portion of a first-end portion of a housing of the inventive LED light fixture.

FIGURE 34 is front perspective view of the upper portion of FIGURE 33.
FIGURE 35 is a rear perspective view of an end-casting of a second-end portion of the housing of the inventive LED light fixture.
FIGURE 36 is a front perspective view of the end-casting of FIGURE 34.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

FIURES 1-36 illustrate preferred embodiments of the LED light fixture 10OA-100E in accordance with this invention. Common or similar parts are given same numbers in the drawings of all embodiments, and the floodlight fixtures are often referred to by the numeral 100, without the A or E lettering used in the drawings, and in the singular for convenience.

Floodlight fixture 100 includes a housing 10 that has a first end-portion 11 and a second end-portion 12 and a single-piece extrusion 20 that has first and second ends 201 and 202, respectively, with first and second end-portions 11 and 12 secured with respect to first and second ends 201 and 202, respectively. Single-piece extrusion 20 includes a substantially planar base 22 extending between first and second ends 201 and 202. Base 22 has an LED-adjacent surface 220 and an opposite surface 221.
Single-piece extrusion 20 further has a heat-dissipating section 24 having heat-dissipating surfaces 241 extending from opposite surface 221. Light fixture

-9-further includes an LED arrangement 30 mounted to LED-adjacent surface 220 in non-water/ air-tight condition with respect to housing 10. (See FIGURES 1, 3, 7, 12-31) In these embodiments, second end portion 12 forms an endcap 120.
As best seen at least in FIGURES 7, 12 ,14, 27 and 30, housing 10 forms a venting gap 14 between each end-portion 11 and 12 and single-piece extrusion 20 to provide ingress of cool air 3 to and along the heat-dissipating surfaces 241 by upward flow of heated air 5 therefrom. FIGURES 8-10 illustrate the flow of air through heat-dissipating section 24 of extrusion 20. The upward flow of heated air 5 draws coil air 3 into heat-dissipating section 24 and along heat-dissipating surfaces 241 without any aid from mechanical devices such as fans or the like.

As seen in FIGURE 11, first end-portion 11 forms a water/air-tight chamber 110 enclosing an electronic LED driver 16 and/or other electronic and electrical components needed for LED light fixtures. First end-portion 11 has upper and lower portions 11 A and 11 B which are hinged together by a hinge 11 C. This hinging arrangement facilitates easy opening of first end-portion 11 by the downward swinging of lower portion 11 B. LED driver 16 is mounted on lower portion 11 B
for easy maintenance.

First end-portion 11 at first end 201 of extrusion 20 has a lower surface 111 and an extrusion-adjacent end surface 112. As best seen in FIGURES 7, 27 and 30, extrusion-adjacent end surface 112 and lower surface 111 form a first recess which extends away from first end 201 of extrusion 20 and defines a first venting gap 141. End surface 112 along first recess 114 is tapered such that first venting gap 141 is upwardly narrowed, thereby to direct and accelerate the air flow along heat-dissipating surfaces 241.

Endcap 120 at second end 202 of extrusion 20 has an inner surface 121 and a lower edge-portion 122. Inner surface 121 and lower edge-portion 122 of endcap form a second recess 124 which extends away from second end 202 of extrusion and defines a second venting gap 142. Inner surface 121 along second recess 142 is tapered such that second venting gap 142 is upwardly narrowed, thereby to direct and accelerate the air flow along heat-dissipating surfaces 241.

-10-As best seen in FIGURES 1, 3, 7 and 11-31, LED arrangement 30 is secured outside water/air-tight chamber 110 and is free from fixture enclosures. LED
arrangement 30 includes a plurality of LED-array modules 31 or 32. As further seen in these FIGURES, LED-array modules 31 and 32 are substantially rectangular elongate modules.
LED-array modules 31 and 32 each have a common module-width 310 (see FIGURES 12-31). LED-adjacent surface 220A has a width 222 which is approximately the multiple of the maximum number of LED-array modules mountable in side-by-side relationship thereon by common module-width 310.

FIGURES 13, 15 and 16 show alternative arrangements of LED-array modules 31 on LED-adjacent surface 220 of same width 222 as shown in FIGIRES 12 and 14.
LED-array modules further have predetermined module-lengths associated with the numbers of LEDs 18 on modules 31 or 32.
FIGURES 1 and 12 best show LED light fixture 100A with modules 31 each having ten LEDs 18 thereon determining a module-length 311. Fixture 100A has LED-adjacent surface 220A with a length 224A which is approximately a dimension of predetermined module-lengths 311.
FIGURES 3 and 14 best show LED light fixture 100B with modules 32 each having twenty LEDs 18 thereon determining a module-length 312. Fixture 100E
has LED-adjacent surface 220B with a length 224B which is approximately a dimension of predetermined module-lengths 312.

FIGURES 13 and 15 illustrate how, based on illumination requirements, LED
lighting fixture 100 allows for a variation in a number of modules 31 or 32 mounted on LED-adjacent surface 220. FIGURE 16 illustrates a combination of different-length modules 31 and 32 on LED-adjacent surface 220B.

FIGURES 17-20 show an LED light fixture 100C with modules 32 each having twenty LEDs 18 thereon determining a module-length 312. Fixture 1000 has LED-adjacent surface 220C with a length 224C which is approximately a double of module-length 312 of each of LED-array modules 32. FIGURES 17-20 show alternative arrangements of LED-array modules 32 on LED-adjacent surface 220C
of same width 222. FIGURES 21, 22 and 22A show a combination of different-length

-11-modules 31 and 32 on LED-adjacent surface 220C. Such arrangement allows for providing a reduced illumination intensity by reducing a number or LED modules or using modules 31 with less LEDs FIGURES 23-26 show an LED light fixture 100D with LED-adjacent surface 220D supporting a plurality of modules of different module-lengths - both modules 31 (ten LEDs 18) with module-length 311 and modules 32 (twenty LEDs 18) with module-length 312. Fixture 100D has LED-adjacent surface 220D with a length which is approximately a sum of module-lengths 311 and 312 of pairs of LED-array modules 31 and 32 in end-to-end relationship to one another. FIGURES 23-26 show alternative arrangements of LED-array modules 31 and 32 on LED-adjacent surface 220D.
FIGURES 17-26 illustrate fixtures 1000 and 100D with the plurality of LED-array modules 31 and 32 in end-to-end relationship to one another. In such arrangement, the modules are positioned as modules 33 which are proximal to first end-portion 11, and modules 34 which are distal from first end-portion 11. It can be seen in FIGURES 7, 27 and 30, modules 31 and 32 include wireways 13 that connect to water/air-tight wire-accesses 113 and 123 of first and second end-portions 11 and

12, respectively.
Extrusion 20 includes a water/air-tight wireway 26 for receiving wires 19 from distal LED-array modules 34. Wireway 26 is connected to housing 10 through wire-accesses 115 and 125 of first and second end-portions 11 and 12, respectively.
Wires 19 from distal modules 34 reach water/air-tight chamber 110 of first end-portion 11 through wireway 26 connected to water/air-tight wire-access 115. Wireway 26 extends along and trough heat-dissipating section 24 and is spaced from base 22.
Heat-dissipating section 24 includes parallel fins 242 along the lengths of single-piece extrusion 20. FIGURES 5 and 6 illustrate wireway 26 as formed of and along fin 242.
Fin 242 is a middle fin positioned at longitudinal axis of extrusion 20.
However, wireway 26 may be formed along any other fin. Such choice depends on the fixture configuration and in no way limited to the shown embodiments. Wireway 26 may be positioned along fin 242 at any distance from base 22 that provides safe temperatures for wires 19. It should, therefore, be appreciated that wireway 26 may be positioned at a tip of fin 242 with the farthest distance from base 22. Alternatively, if temperature characteristics allow, wireway 26 may be positioned near the middle of fin 242 and closer to base 22.
Wire-accesses 115, 125 and wireway 26 provide small surfaces between water/air-tight chamber and non-water/air-tight environment. Such small surfaces are insulated with sealing gaskets 17 thereabout. In inventive LED light fixture 100, the mounting of single-piece extrusion 20 with respect to end-portions 11 and 12 provides sufficient pressure on sealing gaskets 17 such that no additional seal, silicon or the like, is necessary.

FIGURES 28-32 show LED light fixture 100E in which single-piece extrusion 20E has a venting aperture 28 therethrough to provide ingress of cool-air 3 to and along heat-dissipating surfaces 241 by upward flow of heated air 5 from surfaces 241.
Venting aperture 28, as shown in FIGURES 28, 29, 31 and 32, is elongate aperture across a majority of the width of base 22. FIGURES 28-31 further show a deflector member 15 secured to base 22 along elongate aperture 28. Deflector member 15 has a pair of oppositely-facing beveled deflector surfaces 150 oriented to direct and accelerate air flow in opposite directions along heat-dissipating surfaces 241.

In LED light fixture 100E, as shown in FIGURES 28-32, the plurality of LED-array modules 31 are in lengthwise relationship to one another. Venting aperture 28 is distal from first and second ends 201 and 202 of extrusion 20.

In LED light fixture 100E distal LED-array modules 34 are spaced from proximal LED-array modules 33. Venting aperture 28 is distal from first and second ends 201 and 202 of extrusion 20 and is at the space 29 between proximal and distal LED-array modules 33 and 34.

LED-adjacent surface 220E of fixture 100E has a length 224E. As best shown in FIGURE 28, length 224E is approximately a dimension of combined (a) sum of module-length 311 of pairs of end-to-end LED-array modules 31 and (b) the length of space 29 between proximal and distal LED-array modules 33 and 34. LED-adjacent surface 220E, as further shown in FIGURE 28, has width 222 which is approximately the multiple of the three LED-array modules 31 mounted in side-by-side relationship thereon by module-width 310.

-13-FIGURES 33 and 34 best illustrate first end-portion 11 which is configured for mating arrangement of with single-piece extrusion 20 and its wireway 26.
FIGURES 35 and 36 illustrate second end-portion 12 which is configured for mating arrangement with single-piece extrusion 20 and its wireway 26 and shows wire-accesses 123 and 125 through which wires 19 are received into second end-portion 12 and channeled to wireway 26.
While the principles of the invention have been shown and described in connection with specific embodiments, it is to be understood that such embodiments are by way of example and are not limiting.

-14-

Claims

1. An LED light fixture comprising;
= a single-piece extrusion extending between first and second ends and including (i) a substantially planar base having an LED-adjacent surface and an opposite surface, (ii) a heat-dissipating section having heat-dissipating surfaces extending from the opposite surface and being open to water/air flow thereover, and (iii) substantially closed compartments one extending along each side of the base and open at the first and second extrusion ends;
= a housing including at least one end-portion secured with respect to one end of the single-piece extrusion and forming at least one venting gap therebetween to provide cool-air ingress to and along the heat-dissipating surfaces by upward flow of heated air therefrom; and = an LED arrangement mounted to the LED-adjacent surface in non-water/air-tight condition with respect to the housing.

2. The LED light fixture of claim 1 wherein the at least one end-portion includes a first end-portion which forms a closed chamber enclosing at least one electronic LED driver.

3. The LED light fixture of claim 1 wherein:
= the at least one end-portion includes first and second end-portions secured with respect to first and second extrusion ends, respectively; and = the at least one venting gap includes a venting gap between each end-portion and the single-piece extrusion.

4. The LED light fixture of claim 3 wherein:
= the first end-portion forms a water/air-tight chamber; and = the second end-portion forms an endcap.

5. The LED light fixture of claim 1 wherein the LED arrangement includes at least one LED-array module.

6. The LED light fixture of claim 5 including a plurality of LED-array modules.

7. The LED light fixture of claim 6 wherein:
= the LED-array modules are substantially rectangular elongate modules each having a common module-width; and = the LED-adjacent surface has a width which is approximately the multiple of the maximum number of LED-array modules mountable in side-by-side relationship thereon by the common module-width.

8. The LED light fixture of claim 6 wherein:
= the LED-array modules are substantially rectangular elongate modules having predetermined module-lengths associated with the numbers of LEDs on the modules; and = the LED-adjacent surface has a length which is approximately a dimension selected from (a) the predetermined module-lengths and (b) the sum(s) of the module-lengths of pairs of the LED-array modules.

4. The LED light fixture of claim 8 wherein:
.cndot. the LED-array modules have common module-widths; and .cndot. the LED-adjacent surface has a width which is approximately the multiple of the maximum number of LED-array modules mountable in side-by-side relationship thereon by the common module-width.

10. The LED light fixture of claim 8 wherein at least one of the plurality of modules has a module-length different than the module-length of at least another of the plurality of modules.

11. The LED light fixture of claim, 8 wherein;
.cndot. the at least one end-portion includes a first end-portion which forms a water/air-tight chamber;
.cndot. the plurality of LED-array modules includes LED-array modules in end-to-end relationship to one another, the modules including modules proximal to the first end-portion and modules distal from the first end-portion; and .cndot. the first end-portion has water/air-tight wire-access(es) receiving wires from the proximal module(s).

12. The LED light fixture of claim 11 wherein the extrusion includes water/air-tight wireway(s) receiving wires from the distal LED-array module(s), whereby wires from the distal modules reach the water/air-tight chamber of the first end-portion through the wireway(s).

13. The LED light fixture of claim 12 wherein the wireway(s) are formed along the heat-dissipating section and spaced from the base.

14, The LED light fixture of claim 13 wherein:
.cndot. the heat-dissipating section includes parallel fins along the lengths of the single-piece extrusion; and .cndot. the wireway(s) are formed along the fin(s).

15. The LED light fixture of claim 1 wherein the extrusion includes water/air-tight wireway(s) therealong.

16. The LED light fixture of claim 15 wherein the wireway(s) are along the heat-dissipating section and spaced from the base.

17. The LED light fixture of claim 16 wherein:
.cndot. the heat-dissipating section includes parallel fins along the lengths of the single-piece extrusion; and .cndot. the wireway(s) are formed along the fin(s).

18. The LED light fixture of claim 1 wherein:
.cndot. the single-piece extrusion includes first and second ends; and .cndot. the at least one end-portion of the housing includes a first end-portion at the first end of the extrusion, the first end-portion having a lower surface and an extrusion-adjacent end surface, the extrusion-adjacent end surface and the lower surface forming a first recess extending away from the first end of the extrusion and defining a first venting gap.

19. The LED light fixture of claim 18 wherein the end surface along the first recess is tapered such that the first venting gap is upwardly narrowed, thereby to direct and accelerate the air flow along the heat-dissipating surfaces.

20. The LED light fixture of claim 19 wherein at least one end-portion also includes a second end-portion forming an endcap at the second end of the extrusion, the endcap having an inner surface and a lower edge-portion forming a second recess extending away from the second end of the extrusion and defining a second venting gap.

21. The LED light fixture of claim 20 wherein the inner surface along the second recess is tapered such that the second venting gap is upwardly narrowed, thereby to direct and accelerate the air flow along the heat-dissipating surfaces.

22. The LED light fixture of claim 1 wherein:
.cndot. the LED arrangement includes a plurality of LED-array modules; and .cndot. the base of the single-piece extrusion has at least one venting aperture therethrough to provide cool-air ingress to and along the heat-dissipating surfaces by upward flow of heated air therefrom.

23. The LED light fixture of claim 22 wherein:
.cndot. the at least one venting aperture includes at least one elongate aperture across at least a majority of the width of the base; and .cndot. a deflector member secured to the base along the elongate aperture and having at least one beveled deflector surface oriented to direct and accelerate air flow along the heat-dissipating surfaces.

24. The LED light fixture of claim 23 including a pair of oppositely-facing beveled deflector surfaces oriented to direct air flow in opposite directions along the heat-dissipating surfaces.

25. The LED light fixture of claim 22 wherein:
.cndot. the plurality of LED-array modules includes LED-array modules in lengthwise relationship to one another; and .cndot. the at least one venting aperture includes at least one aperture distal from the first and second ends of the extrusion.

26. The LED light fixture of claim 25 wherein:
.cndot. the plurality of LED-array modules includes at least one proximal LED-array module proximal to a first end of the extrusion and at least one distal LED-array module distal from the first end of the extrusion;
.cndot. the distal LED-array module(s) are spaced from the proximal LED-array module(s); and .cndot. the venting aperture(s) distal from the first and second ends of the extrusion are at the space between the proximal and distal LED-array modules.

27. The LED light fixture of claim 26 wherein:
.cndot. the LED-array modules are substantially rectangular elongate modules having predetermined module-lengths associated with the numbers of LEDs on the modules; and .cndot. the LED-adjacent surface has a length which is approximately a dimension which is (a) the sum of the module-lengths of pairs of the end-to-end LED-array modules plus (b) the length of the space between the proximal and distal LED-array modules.

28. The LED light fixture of claim 27 wherein:
.cndot. the LED-array modules each have a common module-width; and .cndot. the LED-adjacent surface has a width which is approximately the multiple of the maximum number of LED-array modules mountable in side-by-side relationship thereon by the common module-width.

29. An LED light fixture comprising:
.cndot. a housing including at least one end-portion;
.cndot. an LED arrangement secured with respect to the housing in non-water/air-tight condition and including a plurality of substantially rectangular elongate LED-array modules each having a common module-widths and a predetermined module-lengths associated with the numbers of LEDs on the modules; and .cndot. a single-piece extrusion secured with respect to the end-portion and including a substantially planar base having an LED-adjacent surface supporting the LED arrangement and an opposite surface with a heat-dissipating section having heat-dissipating surfaces extending from the opposite base surface, the LED-adjacent surface having:
.cndot. a width which is approximately a multiple of the common module-widths thereby allowing for variation in the number of LED-array modules mountable in side-by-side relationship thereon; and .cndot. a length which is approximately the sum of the module-lengths of pairs of the LED-array modules thereby allowing for variation in a number of modules mounted in lengthwise relationship thereon.

30. The LED light fixture of claim 29 wherein at least one of the plurality of modules has a module-length different than the module-length of at least another of the plurality of modules.

31. The LED light fixture of claim 29 wherein the base of the single-piece extrusion has at least one venting aperture therethrough to provide cool-air ingress to and along the heat-dissipating surfaces by upward flow of heated air therefrom.

32. The LED light fixture of claim 31 wherein:
.cndot. the at least one venting aperture includes at least one elongate aperture across at least a majority of the width of the base; and .cndot. a deflector member secured to the base along the elongate aperture and having at least one beveled deflector surface oriented to direct and accelerate air flow along the heat-dissipating surfaces.

33. The LED light fixture of claim 31 wherein:
.cndot. the plurality of LED-array modules includes LED-array modules in lengthwise relationship to one another; and .cndot. the at least one venting aperture includes at least one aperture distal from the first and second ends of the extrusion.

34. The LED light fixture of claim 33 wherein:
.cndot. the plurality of LED-array modules includes at least one proximal LED-array module proximal to a first end of the extrusion and at least one distal LED-array module distal from the first end of the extrusion;
.cndot. the distal LED-array module(s) are spaced from the proximal LED-array module(s); and .cndot. the venting aperture(s) distal from the first and second ends of the extrusion are at the space between the proximal and distal LED-array modules.

35. The LED light fixture of claim 34 wherein the LED-adjacent surface has a length which is approximately a dimension which is (a) the sum of the module-lengths of pairs of the end-to-end LED-array modules plus (b) the length of the space between the proximal and distal LED-array modules.

36. A light fixture comprising:
.cndot. a housing;
.cndot. electrical, components secured with respect to the housing; and .cndot. an extruded heat-sink member secured with respect to the housing and having a base with a front surface adjacent to the electrical components, an opposite back surface, and a heat-dissipating section with heat-dissipating surfaces extending from the back surface; and .cndot. a water/air-tight wireway extending through and along the heat-dissipating section and spaced from the base back surface for receiving wires extending to/from the electrical component(s).

37. The light fixture of claim 36 wherein:
.cndot. the heat dissipating section includes parallel fins along the lengths of the extrusion; and .cndot. the wireway(s) are formed along at least one of the fins.

38. The light fixture of claim 36 wherein:
.cndot.the base front surface is an LED-adjacent surface; and .cndot. the electrical components include an LED arrangement mounted to the LED-adjacent surface.

39. An LED light fixture comprising:
.cndot. a single-piece extrusion extending between first and second ends and including (i) a substantially planar base having an LED-adjacent surface and an opposite surface and (ii) a heat-dissipating section having heat-dissipating surfaces extending from the opposite surface and being open to water/air flow thereover, the base having at least one venting aperture therethrough and distal from the first and second ends of the extrusion to provide cool-air ingress to and along the heat-dissipating surfaces by upward flow of heated air therefrom;
.cndot. a housing secured with respect to the single-piece extrusion; and .cndot. an LED arrangement mounted to the LED-adjacent surface in non-water/air-tight condition with respect to the housing.

40. The LED light fixture of claim 1 wherein the housing includes at least one end-portion secured with respect to the single-piece extrusion and forming at least one venting gap therebetween to provide cool-air ingress to and along the heat-dissipating surfaces by upward flow of heated air therefrom.