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.