Materials: Chassis parts are die-formed 20 gauge cold rolled steel with integral adjustable hanger clamp. Reflectors–low iridescent specular aluminum are standard. Finish: Chassis exterior–phosphate undercoating, baked white acrylic enamel. Reflector–low iridescent specular IS standard. Lens: Virgin acrylic .187 pattern 19 with square based male conical prisms (rotates for easy lamp replacement). Electrical: Rapid start HPF, thermally protected class “P” ballast (Biax type). If K.O. is within 3 of ballast, use wire suitable for at least 90°. Labels: I.B.E.W./UL and ULc Listed.