Abstract:
An LED light fixture includes a housing forming a chamber enclosing at least one drive and an extruded portion extending therefrom. In some embodiments, the housing has a dimension in the extruded direction no less than one-third of the fixture length, and the sides of the extruded portion and of the housing have substantially congruent profiles such that enclosure and heat-dissipation functions of the fixture are facilitated without substantial discontinuity in fixture configuration therealong viewed from positions below. A plurality of substantially rectangular LED-array modules are mounted to the LED-adjacent surface which has length and width dimensions accommodating multiple modules of predetermined width and lengths.

Description:
RELATED APPLICATION 
       [0001]    This application is a continuation of patent application Ser. No. 13/333,198, filed Dec. 21, 2011, now U.S. Pat. No. 8,313,222, issued Nov. 20, 2012, which is a continuation of patent application Ser. No. 12/418,364, filed Apr. 3, 2009, now U.S. Pat. No. 8,092,049, issued Jan. 10, 2012, which is based in part on U.S. Provisional Application Ser. No. 61/042,690, filed Apr. 4, 2008. The entirety of the contents of each application Ser. Nos. 13/333,198, 12/418,364 and 61/042,690 are incorporated herein by reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    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 
       [0003]    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. 
         [0004]    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. 
         [0005]    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. 
         [0006]    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. 
         [0007]    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 
       [0008]    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. 
         [0009]    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. 
         [0010]    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. 
         [0011]    Still another object of the invention is to provide an improved LED light fixture achieving excellent heat dissipation yet involving minimal structural complexity. 
         [0012]    How these and other objects are accomplished will become apparent from the following descriptions and the drawings. 
       SUMMARY OF THE INVENTION 
       [0013]    The owner of the present invention also owns a U.S. patent application Ser. No. 11/860,887 which discloses an LED Floodlight Fixture that deals with some of the problems and shortcomings of the prior art. 
         [0014]    The present invention is an improvement in LED light fixtures, particularly for street and roadway lights and the like. 
         [0015]    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. 
         [0016]    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. 
         [0017]    In some preferred embodiments the at least one end-portion preferably includes a first end-portion which forms a water/air-tight chamber enclosing at least one electronic LED driver and/or other electronics needed for LEDs. 
         [0018]    Some 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. It is preferred that such embodiments include a venting gap between each end-portion and the single-piece extrusion. In such embodiments, the second end-portion forms an endcap. 
         [0019]    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. 
         [0020]    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 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. 
         [0021]    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 U.S. patent application Ser. No. 11/774,422, the contents of which are incorporated herein by reference. 
         [0022]    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. 
         [0023]    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. 
         [0024]    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. 
         [0025]    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). 
         [0026]    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 through the heat-dissipating along the extrusion and spaced from the base. The heat-dissipating section preferably includes parallel fins along the lengths of the single-piece extrusion. The closed wireway(s) preferably extend(s) along the fin(s). 
         [0027]    The wireway may be an enclosed tube secured with respect to the fin. Such fin preferably forms an extruded retention channel securely retaining the wireway tube therein. The wireway tube may be a jacketed cord, a separate aluminum tube or other suitable water/air-tight enclosure for wires to be passed from the distal modules to the water/air-tight chamber. The extruded retention channel may have an open “C” shape with an opening being smaller than the inner diameter such that the wireway tube may be secured with respect to the fin by snap fitting or sliding the wireway tube inside the retention channel. 
         [0028]    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. 
         [0029]    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. 
         [0030]    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. 
         [0031]    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-array module(s) are preferably 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. 
         [0032]    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. 
         [0033]    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). 
         [0034]    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. 
         [0035]    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. 
         [0036]    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. 
         [0037]    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). 
         [0038]    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. 
         [0039]    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. 
         [0040]    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 
         [0041]      FIG. 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. 
           [0042]      FIG. 2  is a perspective view from above of the LED light fixture of  FIG. 1 . 
           [0043]      FIG. 3  is a perspective view from below of another embodiment of LED light fixture including LED-array modules with twenty LEDs thereon. 
           [0044]      FIG. 4  is a perspective view from above of the LED light fixture of  FIG. 3 . 
           [0045]      FIG. 5  is a widthwise cross-sectional view of the LED light fixture across the single-piece extrusion showing one configuration of the extrusion. 
           [0046]      FIG. 6  is a widthwise cross-sectional view of the LED light fixture across the single-piece extrusion showing another configuration of the extrusion. 
           [0047]      FIG. 7  is a fragmentary lengthwise cross-sectional view of the LED light fixture of  FIG. 1  taken along lines  7 - 7 . 
           [0048]      FIGS. 8-10  are heat-dissipation diagrams showing air-flow through the LED light fixture. 
           [0049]      FIG. 11  is a perspective view from below of the LED light fixture of  FIG. 1  shown with a lower portion in open position. 
           [0050]      FIG. 12  is a bottom plan view of the LED light fixture of  FIG. 1 . 
           [0051]      FIG. 13  is a bottom plan view of the LED light fixture of  FIG. 12  with an LED arrangement including two side-by-side LED-array modules. 
           [0052]      FIG. 14  is a bottom plan view of the LED light fixture of  FIG. 3 . 
           [0053]      FIG. 15  is a bottom plan view of the LED light fixture of  FIG. 14  with an LED arrangement including two side-by-side LED-array modules. 
           [0054]      FIG. 16  is a bottom plan view of the LED light fixture of  FIG. 14  with an LED arrangement including side-by-side LED-array modules having different lengths. 
           [0055]      FIG. 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. 
           [0056]      FIG. 18-20  are bottom plan views of embodiment of the LED light fixture of  FIG. 17  with same-length LED-array modules mounted in end-to-end relationship to one another showing alternative arrangements of the LED-array modules. 
           [0057]      FIGS. 21 ,  22  and  22 A are bottom plan views of yet more embodiments of the LED light fixture of  FIG. 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. 
           [0058]      FIG. 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. 
           [0059]      FIG. 24-26  are bottom plan views of alternative embodiments of the LED light fixture of  FIG. 23  with showing alternative arrangements of such LED-array modules. 
           [0060]      FIG. 27  is fragmentary lengthwise cross-sectional view of the LED light fixture of  FIG. 17  taken along lines  27 - 27  to show a closed wireway formed of and along the extrusion. 
           [0061]      FIG. 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. 
           [0062]      FIG. 29  is a bottom plan view of another embodiment of the LED light fixture as in  FIG. 28  but for alternative arrangement of LED modules. 
           [0063]      FIG. 30  is a fragmentary lengthwise cross-sectional view of the LED light fixture of  FIG. 28  taken along lines  30 - 30 . 
           [0064]      FIG. 31  is a fragmentary perspective view from below of the LED light fixture of  FIG. 28  showing a deflector member within the venting aperture. 
           [0065]      FIG. 32  is a top plan view of the embodiment of the LED light fixture of  FIG. 28 . 
           [0066]      FIG. 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. 
           [0067]      FIG. 34  is front perspective view of the upper portion of  FIG. 33 . 
           [0068]      FIG. 35  is a rear perspective view of an end-casting of a second-end portion of the housing of the inventive LED light fixture. 
           [0069]      FIG. 36  is a front perspective view of the end-casting of  FIG. 34 . 
           [0070]      FIG. 37  is a widthwise cross-sectional view of the LED light fixture across the single-piece extrusion showing an example of a wireway retention channel. 
           [0071]      FIG. 38  is a fragmentary perspective view from below of the single-piece extrusion of the LED light fixture of  FIG. 22 . 
           [0072]      FIG. 39  is a fragmentary perspective view from above of the single-piece extrusion of  FIG. 37  showing a wireway tube extending from the retention channel. 
           [0073]      FIG. 40  is a fragmentary perspective view from above of the single-piece extrusion of  FIG. 37  showing a wireway tube extending from the retention channel and received by the second end-portion. 
           [0074]      FIG. 41  is a fragmentary perspective view from above of the single-piece extrusion of  FIG. 37  with the wireway tube secured with respect to the second end-portion. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0075]      FIGS. 1-41  illustrate preferred embodiments of the LED light fixture  100 A- 100 E 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. 
         [0076]    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  100  further includes an LED arrangement  30  mounted to LED-adjacent surface  220  in non-water/air-tight condition with respect to housing  10 . (See  FIGS. 1 ,  3 ,  7 ,  12 - 31 ) In these embodiments, second end portion  12  forms an endcap  120 . 
         [0077]    As best seen at least in  FIGS. 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.  FIGS. 8-10  illustrate the flow of air through heat-dissipating section  24  of extrusion  20 . The upward flow of heated air  5  draws coll 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. 
         [0078]    As seen in  FIG. 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. 
         [0079]    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  FIGS. 7 ,  27  and  30 , extrusion-adjacent end surface  112  and lower surface  111  form a first recess  114  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 . 
         [0080]    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  120  form a second recess  124  which extends away from second end  202  of extrusion  20  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 . 
         [0081]    As best seen in  FIGS. 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. 
         [0082]    LED-array modules  31  and  32  each have a common module-width  310  (see  FIGS. 12-31 ). LED-adjacent surface  220 A 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 .  FIGS. 13 ,  15  and  16  show alternative arrangements of LED-array modules  31  on LED-adjacent surface  220  of same width  222  as shown in  FIGS. 12 and 14 . 
         [0083]    LED-array modules further have predetermined module-lengths associated with the numbers of LEDs  18  on modules  31  or  32 . 
         [0084]      FIGS. 1 and 12  best show LED light fixture  100 A with modules  31  each having ten LEDs  18  thereon determining a module-length  311 . Fixture  100 A has LED-adjacent surface  220 A with a length  224 A which is approximately a dimension of predetermined module-lengths  311 . 
         [0085]      FIGS. 3 and 14  best show LED light fixture  100 B with modules  32  each having twenty LEDs  18  thereon determining a module-length  312 . Fixture  100 B has LED-adjacent surface  220 B with a length  224 B which is approximately a dimension of predetermined module-lengths  312 . 
         [0086]      FIGS. 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 .  FIG. 16  illustrates a combination of different-length modules  31  and  32  on LED-adjacent surface  220 B. 
         [0087]      FIGS. 17-20  show an LED light fixture  100 C with modules  32  each having twenty LEDs  18  thereon determining a module-length  312 . Fixture  100 C has LED-adjacent surface  220 C with a length  224 C which is approximately a double of module-length  312  of each of LED-array modules  32 .  FIGS. 17-20  show alternative arrangements of LED-array modules  32  on LED-adjacent surface  220 C of same width  222 .  FIGS. 21 ,  22  and  22 A show a combination of different-length modules  31  and  32  on LED-adjacent surface  220 C. Such arrangement allows for providing a reduced illumination intensity by reducing a number or LED modules  32  or using modules  31  with less LEDs 
         [0088]      FIGS. 23-26  show an LED light fixture  100 D with LED-adjacent surface  220 D 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  100 D has LED-adjacent surface  220 D with a length  224 D 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.  FIGS. 23-26  show alternative arrangements of LED-array modules  31  and  32  on LED-adjacent surface  220 D. 
         [0089]      FIGS. 17-26  illustrate fixtures  100 C and  100 D 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  FIGS. 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. 
         [0090]    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 .  FIGS. 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 .  FIG. 38  shows wireway  26 A as an enclosed tube  27  secured with respect to fin  242 . As can be seen in FIGS.  37  and  39 - 41 , fin  242  forms an extruded retention channel  25  securely retaining wireway tube  27  therein. Wireway  26 A may have a jacketed cord or rigid tube which is made of aluminum or other suitable material. As best seen in  FIG. 37 , extruded retention channel  25  has an open “C” shape with an opening being smaller than the largest inner diameter. When jacketed cord is secured with respect to fin  242  by snap fitting or the rigid tube is slid inside retention channel  25 , retention channel  25  securely holds wireway tube  27 . 
         [0091]    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. 
         [0092]      FIGS. 28-32  show LED light fixture  100 E in which single-piece extrusion  20 E 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  FIGS. 28 ,  29 ,  31  and  32 , is elongate aperture across a majority of the width of base  22 .  FIGS. 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 . 
         [0093]    In LED light fixture  100 E, as shown in  FIGS. 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 . 
         [0094]    In LED light fixture  100 E 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 . 
         [0095]    LED-adjacent surface  220 E of fixture  100 E has a length  224 E. As best shown in  FIG. 28 , length  224 E 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  220 E, as further shown in  FIG. 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 . 
         [0096]      FIGS. 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 . 
         [0097]      FIGS. 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 . 
         [0098]    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.