Abstract: A light fixture housing includes upper and lower members. The upper member includes a top bounded on four sides by a wall and the lower member includes a bottom also bounded on four sides by a wall. The walls of the two members define four corners of the housing. At each of the corners in the upper member a tang with an inclined leading ramp is formed on the inner peripheral surface of the wall and is flanked at two sides by a guide. At each of the corners of the lower member and upstanding tongue extends above the wall and includes an aperture for receiving the tang when the upper and lower members are assembled. A slot is located in at least one of the corners of the upper member adjacent to the locking tang and a notch is formed in the upper end of at least one of the tongues such that a power line may be threaded through and held within the slot. To assemble the housing, the upper and lower members are positioned together and each of the tongues is positioned within a set of guides.