Abstract:
A housing for a light fixture, and the light itself, is disclosed. The housing comprises an elongate body and a resilient member mountable in the body to retain at least one light emitting diode (LED) between the resilient member and the housing such that the or each LED is repositionable within the housing. The light includes at least one LED mounted in the housing.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
   The present application claims the benefit of and priority to United Kingdom Application Serial No. 0618577.1, filed on Sep. 21, 2006, the entire content of which is incorporated herein by reference. 
   BACKGROUND 
   1. Technical Field 
   The present invention relates to a light fixture. In particular, the invention relates to a housing for a light fixture capable of retaining at least one light emitting diode (LED) therein for illuminating paintings or other surfaces. 
   2. Background of Related Art 
   Lights for illuminating pictures and the like are in widespread use and generally comprise one or more light bulbs received in an electrical socket mounted in an elongate shade or hood. Such lights are generally mounted by means of a tubular support arm, one end of which is attached to the shade by a swivel or pivot joint, whilst the opposite end of the arm has a fitting for mounting the light to a picture frame or on a wall. An electrical wire extends through the arm from a connector in the fitting to supply power to the light bulbs from a mains source or battery pack. The pivot or swivel joint allows the angle of the shade to be adjusted relative to the support arm to enable the direction of the beam of light to be controlled to, for example, illuminate a picture. 
   A problem with conventional lights for illuminating pictures and the like is their ability to supply uniform lighting across a required width or region, such as the whole of a picture being illuminated. Conventional lights usually have an elongate shade, which is much shorter than the width of the picture or area to be illuminated and so the intensity of the pool of light tends to weaken towards the edges of the picture. Although attempts have been made available which try to alleviate this problem by, for example, providing light deflectors or baffles mounted in the shade to re-direct the light, the design of such conventional lights is complicated and the light is still not of sufficiently uniform intensity across the whole width of the picture. Although larger shades may house multiple light bulbs in respective sockets, the sockets themselves are in fixed positions and do not enable precise adjustment of the light being generated. 
   A further disadvantage with conventional bulbs is that they produce a large amount of heat that could potentially damage an illuminated painting. 
   In several applications, light emitting diodes (LEDs) are replacing conventional light bulbs. They are particularly suitable for use in lighting a picture or the like as they consume less power and produce a limited amount of heat. 
   The present invention seeks to provide a light or light fixture, and a housing for a light or light fixture, that overcomes or substantially alleviates the problems of those discussed above and, in particular, to provide a more versatile light that can be adjusted to provide more uniform illumination over a given area. 
   SUMMARY 
   According to the present invention, there is provided a housing for a light fixture comprising an elongate body and a resilient member mountable in the body to retain at least one light emitting diode (LED) between the resilient member and the housing such that the or each LED is repositionable within the housing. 
   Preferably, the housing comprises a channel having a base to define an LED supporting surface, the resilient member being configured so that the or each LED is held against the supporting surface by the resilient member. 
   The resilient member may be configured so that the or each LED held against the supporting surface is independently slideable along the supporting surface. 
   In a preferred embodiment the housing comprises a pair of slots in the channel on opposite sides of the LED supporting surface and a resilient member removably received in a respective slot. 
   In one embodiment, each resilient member comprises a rail, the rails in respective slots being parallel and spaced from each other. 
   The rails may be electrically conductive so as to contact electrical terminals on the or each LED on the LED supporting surface to supply power thereto. 
   Each resilient member conveniently has a base slidably received in said slot and, an arm extending into said channel and towards the LED supporting surface from said base. 
   Preferably, the arm of each resilient member is configured so that, when one or more LEDs are positioned on the LED supporting surface, the arm is resiliently deformed by the LED to hold said LED against said LED supporting surface. 
   Advantageously the elongate body has a uniform cross-section at any point along its length so that it may be cut to any desired length prior to use. 
   Preferably, the housing according to any preceding claim comprises a pair end caps attachable to each end of the elongate body. 
   At least one end cap may be removable to enable one or more LEDs to be slid into the channel between the resilient members and the LED supporting surface, or removed therefrom. 
   The housing advantageously includes a plurality of fins formed on the housing to dissipate heat generated by the or each LED. 
   In one embodiment the housing comprises a pair of arms to support the housing. 
   Preferably, the housing comprises a pair of resilient tracks configured to be resiliently biased towards the arms at one end so as to contact the arms, the resilient tracks contacting the pair of rails at the other end, wherein the arms and the resilient track are electrically conductive so as to contact the arms to the rails to supply power thereto. 
   The housing may further comprise a switch, wherein the switch is actionable to contact one of the resilient tracks and move said resilient track away from one of the arms so as to break the electrical contact between said resilient track and arm. 
   Preferably, the housing includes a diffuser slideably mounted in the body to diffuse light generated by the or each LED. 
   In a preferred embodiment the housing comprises a reflective material mounted in the channel such that the or each LED is extendable therethrough to reflect light generated by the or each LED. 
   A light may include a housing and at least one LED held against the LED supporting surface by the resilient member. 
   Preferably the light comprises a plurality of LEDs held against the LED supporting surface by the resilient members, each LED being discrete and independently movable relative to each of the remaining LEDs. 
   In one embodiment, the or each LED comprises an light emitting portion and a supporting plate, the resilient members acting against the supporting plate to retain the LED against the LED supporting surface. 
   The or each LED may have electrical terminals formed on the supporting plate and the resilient members are may be configured so that they lie in contact with said electrical terminals when said LEDs are positioned against the LED supporting surface. 

   
     DETAILED DESCRIPTION OF THE DRAWINGS 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: 
       FIG. 1  is an elevated perspective view of a light fixture in accordance with an embodiment of the present invention mounted for use in illuminating a picture; 
       FIG. 2  is a perspective view from above of the elongate housing of the light fixture shown in  FIG. 1 ; 
       FIG. 3  is a perspective view from below of the elongate housing shown in  FIG. 2  with an LED disposed therein; 
       FIG. 4  is a cross sectional view of the elongate housing shown in  FIG. 3  with resilient members therein; 
       FIG. 5  is another perspective view from below of the elongate housing shown in  FIG. 4  with the resilient members therein; 
       FIG. 6  is another perspective view from above of the elongate housing shown in  FIG. 4  with the resilient members partially slid out of the housing together with an LED therebetween; 
       FIG. 7  is an exploded perspective view of the light fixture shown in  FIG. 1 ; 
       FIG. 8  is an inner end view of a first end cap of the light shown in  FIG. 1  with a light switch in an ‘on’ position; 
       FIG. 9  is the end view of  FIG. 8  but with the light switch in an ‘off’ position; 
       FIG. 10  is an end view of the other end cap of the light fixture shown in  FIG. 1 ; 
       FIG. 11  is a perspective view of a first conductive track forming part of the switch mechanism of the light fixture shown in  FIG. 1 ; 
       FIG. 12  is a perspective view of a second conductive track forming part of the switch mechanism of the light fixture shown in  FIG. 1 ; 
       FIG. 13  is a plan view of the second end cap shown in  FIG. 10  with the second conductive track of  FIG. 12  disposed thereon; 
       FIG. 14  is a perspective view of the elongate housing shown in  FIG. 4  to show how a diffuser may be attached thereto; 
       FIG. 15  is a perspective view of the elongate housing shown in  FIG. 6  to show how a reflector may be attached thereto, and 
       FIGS. 16A and 16B  shows a further modification in which a plastic or metal plate having pivotable/slideable baffles or, an adjustable aperture is provided to enable to the height and the width of the beam of light to be controlled. 
   

   DETAILED DESCRIPTION OF EMBODIMENTS 
   Referring now to the drawings, there is shown in  FIG. 1  a light fixture  1  according to an embodiment of the present invention, attached to arms  2 ,  3  which may be mounted to a picture frame (not shown) or the like by means of mounting brackets  4  (see  FIG. 7 ). The light fixture  1  comprises an elongate housing  5  and first and second end caps  6 ,  7  fixed to first and second ends  5   a ,  5   b  of the elongate housing  5  by means of first and second flange portions  6   a ,  6   b ,  7   a ,  7   b  (see  FIG. 8 ) extending from first and second caps  6 ,  7  and which locate in first and second ends  5   a  and  5   b  of the elongate housing  5  respectively, as will be explained hereinafter. Further, each arm  2 ,  3  is mounted to a respective end cap  6 ,  7 . 
   Referring to  FIGS. 2 to 4 , it can be seen that the elongate housing  5  has a uniform cross section which is defined by lower and rear faces  8 ,  9  which are perpendicular to each other. An arcuately shaped upper face  10  is formed between the respective distal ends  11 ,  12  of the lower and rear faces  8 ,  9  such that the shape of the housing  5  is defined and the junction between each face  8 ,  9 ,  10  is rounded. It will be appreciated that alternative shapes may be used for the housing  5  dependent on the desired aesthetic appearance. 
   A channel  13  is formed in the elongate housing  5  and extends along the length of the housing  5 . The channel  13  has an opening  14  in the lower face  8  of the housing  5  and is comprised of a channel base  13   a  parallel to the lower face  8  and two opposing channel sides  13   b ,  13   c  formed perpendicular to the channel base  13   a . First slots  15  are formed on opposing sides  13   b ,  13   c  of the channel  13  proximate to the channel opening  14  and extend parallel to the lower face  8 . Opposing front and rear recessed regions  16 ,  17  are formed in each channel side  13   b ,  13   c  between the first slots  15  and the base  13   a . Located adjacent to each recessed region  16 , 17  communicating with the channel  13  are second slots  18  formed on opposing sides  16   a ,  16   b ,  17   a ,  17   b  of each recessed region  16 ,  17  respectively. 
   The elongate housing also comprises a rear recess  19  formed in the rear face  9 . Portions  9   a ,  9   b  of the rear face  9  overhang the rear recess  19  to define opposing rear slots  20 . Further, a number of grooves  21  are formed in the upper face  10  to define a number of fins  22  disposed above the channel  13 . Each groove  21  extends into the housing  5  such that there is a thin wall remaining between a base  21   a  of each groove  21  and the channel base  13   a . Each fin  22  is slightly arcuate in shape. The elongate housing  5  may be formed from extruded metal or plastic material and, because the housing  5  has a uniform or constant cross-section, it may be cut to any required length prior to attachment of the end caps  6 , 7 . 
   A plurality of individual or discrete light emitting diode (LED) assemblies  23  are located in the channel  13  as shown in  FIGS. 3 to 6  (only one LED is shown in  FIGS. 3 and 5 ). The LED assembly  23  comprises a light emitting diode (LED)  24  disposed centrally on an LED mounting plate  25 . The LED  25  is a white light producing LED although it will be understood that alternative colour producing LEDs may be used, if required. The LED mounting plate  25  is formed from a heat conductive material such as aluminium, comprising opposing upper and lower planar faces  26 ,  27  and side surfaces  28   a ,  28   b ,  28   c ,  28   d ,  28   e ,  28   f  each separated by facets. Electrical terminals  29 ,  30  are mounted on the lower face  26  of the LED mounting plate  25  such that they are slightly upstanding therefrom, and located relative to the LED  24  such that they electrically communicate therewith to define positive and negative electrical terminals  29 ,  30  respectively. The electrical terminals  29 ,  30  extend in opposing directions from the LED  24  along the lower face  27  of the LED mounting plate  25  towards two opposing side surfaces, for example,  28   a ,  28   b  respectively. 
   The LED assembly  23  is disposed in the channel  13  of the elongate housing  5  such that the upper planar face  29  is disposed against the channel base  13   a  and is slidable therealong. Further, the two side surfaces  28   a ,  28   b  proximate to the electrical terminals  29 , are located against the channel sides  13   b ,  13   c  to prevent rotation of the LED mounting plate  25  relative to the housing  5  as will be explained below. 
   First and second elongate resilient members  33 ,  34  are shown in  FIGS. 4 to 6  and each member  33 ,  34  comprises a base portion  35  with a pair of ends  35   a ,  35   b  and an arm  36  upstanding from midway along a front face  37  of the base portion  35 . Each arm  37  comprises first and second arm portions  38 ,  39 , the first arm portion  38  extending obliquely upwards from the base portion  35  to communicate at a distal end with a lower face  41  of the second arm portion  39 . The second arm portion  39  extends perpendicularly to the base portion  36  from the first arm portion  38  and an electrically conductive foil strip  40  is mounted along the longitudinal length of an upper face  42  of the second arm portion  39 . The resilient members  33 ,  34  may be formed from a resilient plastic material or the like. In an alternative embodiment the resilient members  33 ,  34  may be formed from a conductive material, such as copper. In which case, the housing  5  is formed from a non-conductive material. 
   The first resilient member  33  is slidably received in the elongate housing  5  with the ends  36   a ,  36   b  of the base portion  36  extending into the respective second slots  18  formed in the sides  16   a ,  16   b  of the front recessed region  16  such that the arm  37  extends into the channel  13  and the conductive foil strip  40  opposes the channel base  13   a . Similarly, the second resilient member  34  is received in the elongate housing  5  in the second slots  18  formed in the sides  17   a ,  17   b  of the rear recessed region  17  such that the arm  37  extends into the channel  13  and the conductive foil strip  40  opposes the channel base  13   a . The gap  43  formed between the foil strip  40  and the base of the channel  13   a  is slightly less than the width of the LED mounting plate  25  such that the mounting plate  25  of each LED(s) assembly  23  disposed in the channel  13  is resiliently held between the channel base  13   a  and each upper face  42  of the first and second resilient members  33 ,  34  as will be explained in more detail below. 
   First and second end caps  6 ,  7  are shown in  FIGS. 7 to 10  and each comprise a first end  44  and a second end  45 , wherein the first end  45  is defined by a curved or contoured outer end surface. The second end  45  has a substantially planar face to correspond to the first end  5   a  of the elongate housing  5  and outer dimensions in cross section corresponding to the elongate housing  5  wherein planar lower and rear faces  46 ,  47  and an arcuate upper face  48  correspond to the lower, upper and arcuate faces  8 ,  9 ,  10  of the housing  5  respectively. 
   Referring now to the first end cap  6 , first and second parallel flange portions  6   a ,  6   b  extend from the second end  45  parallel to the lower face  46 . A stepped recess  49  is formed in the first end cap  6  between the first and second flange portions  6   a ,  6   b  such that the recess  49  is open along a portion of the lower and rear faces  46 ,  47 . A rear section of the recess  49  extends to an inner face  50 , and the front portion  51  of the recess  49  extends into the first end cap  6  such that the first end cap  6  is substantially hollow. A large cylindrical recess  52  is formed in the stepped portion  50  and a further smaller cylindrical recess  53  is formed in the stepped portion  50  above the large cylindrical recess  52  for reasons which will become apparent below. The second end cap  7  is substantially a mirror image of the first end cap  6 , with first and second parallel flange portions  7   a ,  7   b . However, the small cylindrical recess  52  is not formed therein. 
   With reference to  FIG. 7 , first and second arms  2 ,  3  are a pair of cylindrical rods which are uniform in length and cross sectional shape. Each rod has first and second end portions  56 ,  57  which are parallel to each other and the distance between the central axes of first and second end portions  56 ,  57  of arm  2  is equal to distance between the central axes of first and second end portions  56 ,  57  of arm  3 . The first portions  56  of the first and second arms are disposed in opposite directions to each other for reasons which will become apparent below. The arms  2 ,  3  are formed of an electrically conductive material. A plurality of O-rings  58  are mounted circumferentially around the first portions  56  of first and second arms  2 ,  3 . The first portion  56  of each arm  2 ,  3  is received within the large cylindrical recess  52  of each end cap  6 ,  7  such that the O-rings  58  firmly contact the inner surface  59  of each large cylindrical recess  52 . 
   The first end cap  6  is mounted to the first end  5   a  of the housing  5  with first and second flange portions  6   a ,  6   b  extending into and locating in the housing  5 . The first flange portion  6   a  corresponds to the width of the channel  13  and is slidably received therein such that it is resiliently held between the channel base  13   a  and the upper faces  42  of the first and second elongate resilient members  33 ,  34 . The second flange portion  6   b  corresponds to the dimensions of the first slots  15  and is seated therein. Similarly, the second end cap  7  is mounted to a second end  5   b  of the housing  5  with first and second flange portions  7   a ,  7   b  extending into the housing  5 . The first flange portion  7   a  corresponds to the width of the channel  13  such that it is resiliently held between the channel base  13   a  and the upper face  42  of the pair of elongate resilient members  34  and the second flange portion  7   b  corresponds to the dimensions of the first slots  15  and is seated therein. 
   A conductive track system  60  for electrically communicating first and second arms  2 ,  3  to first and second resilient members  33 ,  34  respectively is shown in  FIGS. 11 to 13  and comprises first and second contact tracks  61 ,  62 . The first contact track  61  is formed from an L-shaped resilient conductive metal strip, such as copper wherein a first side  63  is ‘U’-shaped with an upper length  63   a  running parallel to a lower length  63   b  and perpendicular length  63   c  formed between the upper and lower lengths  63   a    63   b . A raised portion  67  is formed on a lower side  63   d  of the lower length  63   b . The second side  64  comprises a connecting portion  65  with a spring portion  66  at a distal end to the first side  63 , wherein the spring portion  66  is formed such that a first length  66   a  extends substantially perpendicularly upwards to the connecting portion  65  and a second length  66   b  extends obliquely downwards from the distal end of the first length  66   a  to form a ‘V’ shape. A notch  66   c  is formed approximately midway along the second length  66   b  of the spring portion  66  extending away from the first portion to form a raised area. The second contact track  62  is substantially a mirror image of the first contact track  61 , however the connecting portion  68  of the second contact track  62  is shorter than the connecting portion  65  of the first contact track  61  for reasons which will become apparent below. 
   The light of the present invention also includes a switch  69  comprising a lever portion  70  and pivot  71 . The pivot  71  is cylindrical and extends perpendicularly from midway along the lever portion. The lever portion  70  has a shoulder  72  at a first end and is rounded at the second end  73  distal to the shoulder  73 . 
   The U-shaped portion  63  of the first contact track  61  is mounted around the distal end  74  of the second flange portion  6   b  of the first end cap  6  such that the perpendicular length  63   c  abuts it and upper and lower lengths  63   a ,  63   b  extend along the upper and lower surfaces of the second flange portion  6   b  parallel to the location of the first resilient member  33  when the first end cap  6  is attached to the first end  5   a  of the housing  5  such that the raised portion  67  of the first conductive track  61  contacts the foil strip  40 . The lower length  63   b  extends such that the connecting portion  65  extends into the end cap recess  49  and lies proximate to the inner face  50  of the recess  49 . The second length  66   b  of the spring portion  66  is then aligned to contact the first arm  2  disposed in the first end cap  6 . 
   Similarly the second conductive track  62  is mounted to the second end cap  7  such that the raised portion  67  of the second conductive track  62  contacts the foil strip  40  of the second resilient member  34  and the second length  66   b  of the spring portion  66  is then aligned to contact the second arm  3  disposed in the second end cap  7 . 
   The hinge portion  71  of the switch  69  is rotatably disposed in the small cylindrical recess  53  in the first end cap  6  such that the shoulder portion  70  extends out of the rear opening of the end cap recess  49 . The second end  73  is therefore disposed to contact the notch  66   c  on the second length  66   b  of the spring portion  66  of the first conductive track  61 . 
   The pair of mounting brackets  4  are disclosed in  FIG. 7  and comprise a tube  76  and a plate  77  fixedly mounted at a tangent to the outer surface  78  of the tube  76 . A pair of screw holes  79  are formed through the plate  77  to receive mounting screws or the like (not shown). Further, a transformer  80  is shown with a pair of wires  81  extending therefrom. Each wire  81  has a connector  82  attached to it at the distal ends to the transformer  80 . 
   Each mounting bracket  4  is slidably fitted over the second end portions  57  of the first and second arms  2 ,  3  such that a section of each end portion  57  extends through the tube  76 . The connectors  82  are then each attached to each end portion  57  such that the wires  81  electrically communicate therewith. 
   A diffuser  83  for diffusing light generated by the LED  25  is shown in  FIG. 14 . The diffuser  83  comprises a translucent plate which may be seated in the laterally extending first slots  15  such that it extending substantially along the length of the housing  5 . 
   A reflector  84  for the LED  25  is shown in  FIG. 15 . The reflector  84  comprises a base portion  85  with an aperture  85   a  formed therethrough to receive an LED  25  such that it extends through the aperture  85   a  and side walls  86 ,  87  extending from each side of the base portion  85 . Two of the side walls  86  extend at an oblique angle to the base portion  85  and two side walls  87  extend perpendicular thereto to form a hollow. The reflector  85  may be made from a plastic material wherein the internal walls are chrome plated to reflect light. Extending from the opposite end of each of the oblique walls  86  to the base portion  85 , parallel thereto is an edge portion  88 . 
   Referring to  FIG. 16A , an adjustable light directing means  89  is shown. The adjustable light directing means  89  comprises a pair of mounting plates  90  with a flange  91  extending perpendicularly from one edge of each plate  90 . Rotatably mounted to each plate proximate to the opposing edge of the plate  90  to the flange  91  is an arc-shaped shade section  92  which rotates laterally about a pivot mounted to the plate  90 . As the plates are moved in the direction of arrow A, towards or away from each other, the width of the beam emitted by an LED positioned in the housing above the adjustable light directing means  89  is controlled. Furthermore, as the arc-shaped shade sections  92  are rotated, the vertical extent of the beam is altered. This enables the beam of light to be controlled so as to precisely illuminate the picture irrespective of its size. 
     FIG. 16B  shows an alternative adjustable light directing means  95  in the form of a plate  96  having an adjustable camera like shutter aperture  97  which enables the size of the opening to be adjusted without affecting its circular shape. This light directing means is applicable to the lighting of circular or oval paintings. 
   Operation of the light fixture  1  will now be described. When the light fixture  1  is to be mounted to illuminate a picture or the like (not shown) the elongate housing  5  is cut to the required length and the elongate resilient members  34  are cut to a corresponding length. The light is then assembled as discussed above such that the first and second resilient members  33 ,  34  are received in their respective slots  18 . The required number of discrete LED assemblies are then slid into the channel  13  between the channel base  13   a  and the upper surface  42  of the second arm portion  39  of each resilient member  33 ,  34  such that the positive and negative terminals  30 ,  31  contact the foil strip  40  mounted on the first and second elongate resilient members  33 ,  34  respectively, or in an alternative embodiment wherein the resilient members  33 ,  34  are formed of a conductive material, the upper face  42  of the second arm portion  39 . As the arms  36  are resilient, the LED mounting plates  25  are held securely in position. As well as a user sliding LED assemblies  23  along the channel  13  to their desired positions, it is possible to use one of the additional components that may be seated in the first slots  15  of the housing  5 . 
   The diffuser  83  translucent plate may be seated in the laterally extending first slots  15  such that it extends substantially along the length of the housing  5 . The edge portions  88  of the reflector  85  may alternatively be received in the first slots  15  of the housing  15  such that the reflector  85  is slidable along the channel  13  of the housing, together with a corresponding LED assembly  23  seated therein. 
   The remaining components of the light are then assembled as described above. Affixation of the light is achieved by mounting the brackets  4  to a picture frame or wall (not shown) by means of screws through the screw holes  79  and power is supplied by means of connecting the transformer  80  to a power supply (not shown). As the second end portions  57  of the arms  2 ,  3  are rotatable about the brackets  4  and the housing  5  mounted to the end caps  6 ,  7  is rotatable about the first end portions  56  of the arms  2 ,  3  it is possible for a user to orientate the light into a desired position. The O-rings  58  disposed on the first end portions  56  of the arms which are located in the cylindrical recesses  52  of the end caps  6 ,  7  provide a resistance to prevent rotation of the elongate housing  5  relative to the arms  2 ,  3 . However, it will be appreciated that, instead of O-rings, the arms may include a pin that locates in elongate grooves in the recesses so that the arm will rotate but will be held in position. 
   When the switch  69  is rotated in the small cylindrical recess  53  relative to the housing  5  in an ‘off’ position (as shown in  FIG. 9 ) such that the shoulder  72  is rotated downwards, the second length  66   b  of the spring portion  66  of the first conductive track  61  is orientated away from the first arm  2  and contact between the conductive track  61  and the arm  2  is broken. The notch  66   c  on the second length  66   b  prevents the switch  69  from being rotated into an ‘on’ position (as shown in  FIG. 8 ) due to the action of the spring portion  66 . If a user rotates the switch  69  such that the shoulder  72  rotates downwards over the notch  66   c  then the second length  66   b  is forced outwards due to the resilience of the spring portion  66  and contacts the first arm  2 . 
   The electrical circuit is then complete and so the LED  24  is illuminated. As the second length  66   b  of each conductive track  61 ,  62  is resiliently biased towards the arms  2 ,  3  then contact is retained therebetween as the housing  5  and end caps  6 ,  7  are rotated relative to the arms  2 ,  3 . Furthermore, because each discrete LED assembly is slidable along the housing  5  between the between the channel base  13   a  and the upper face  42  of the resilient member arms  36  then each LED assembly  23  may be repositioned along the housing  5  during use of the light fixture  1 . As the foil strip  40  or upper face  42  of the resilient member arms  36  runs along the length of the housing then contact with the electrical terminals  29 ,  30  is retained. Additionally, sides  28   a ,  28   b  are located relative to the channel sides  13   b ,  13   c  such that the LED mounting plate is constrained from rotating in the channel  13  and so the terminal portions  30 ,  31  remain in contact. 
   Removal of heat generated by the LED is aided by the housing. Heat is conducted through the LED mounting plate  25  from the LED  24  to the channel base portion  13   a  with which it is in contact. The fins  23  on the upper face  10  of the housing  5  act as a heat sink to disperse heat generated by the LED(s) and conducted through the thin wall of the housing  5  thereto to the surrounding air. 
   If the housing  5  requires additional support than that supplied by the arms  2 ,  3  then additional arms (not shown) may be mounted in the rear recess slots  18 . 
   Although embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that these are preferred embodiments only and that variations may be made to the above exemplary embodiments that lie within the scope of the invention, as defined in the claims hereafter.