Fully assembled housing is formed and welded, 20 ga. steel, chemically treated to resist corrosion and enhance paint adhesion. Standard finish is high reflectance white powder coat, applied post production. Knock-outs accept standard electrical fittings (by others). Gasketed lamp holders. Available for one T5 14W, 21W, 28W, 35W linear fluorescent lamps. IBEW manufactured and labeled. I.P. 65 rated.