Killark LZ2N54230 - Lexan® Clear Lens, impact resistant polycarbonate. Housing-one piece fiberglass reinforced polyester, NEMA 4X & IP66 rated. Two 3/4” NTP aluminum hubs - one at each end (includes one 3/4” close-up plug and two 3/4” x 1/2” reducers for maximum user flexibility). Two 1/4”-20 aluminum bushings furnished in top of fixture for threaded rod. 2’ and 4’ luminaries. Lamp types Linear 17, 28, 32, 40, 44, 54, 60W Long compact 40, 55W (single ended). Electronic ballast standard. World voltage (most models) 120 thru 277V, 50/60 Hz Housing-one piece fiberglass reinforced polyester, NEMA 4X and IP66 rated. Lexan clear lens, impact resistant polycarbonate. Two 3/4" NTP aluminum hubs - one at each end (includes one 3/4" close-up plug and two 3/4" x 1/2" reducers for maximum user flexibility). Two 1/4"-20 aluminum bushings furnished in top of fixture for threaded rod. 4' luminaire. Lamp type - linear 32W. Electronic ballast standard. World voltage 120-277V, 50/60 Hz. - Class I, Division 2, Groups A, B, C, D - Class I, Zone 2, Groups IIC, IIB, IIA - Class II, Divisions 1 & 2, Groups E, F, G - Class III, Divisions 1 & 2