A luminaire (41, 141) for a double ended tubular HID lamp (110) is disclosed. The luminaire has a V-shaped reflector (2) having a spine (3) and is bendable into a tensioned state having a generally M-shaped configuration. A pair of lamp holders (60, 61; 160, 161) is connected to the spine and spaced apart a distance corresponding to the length of the tubular lamp. A hollow conduit (43, 158) extends between the lamp holders. A pair of insulated cables (31, 32) interconnects the lamp holders with one of the cables (32) passing through the hollow conduit. The distance between the spine (3) and lamp (110) is able to be adjusted.