High efficiency, low temp lighting assembly; For use in walk-in freezers; Quick-start at low temperatures; Shatterproof polycarbonate diffuser; Built-in gasket assures moisture-proof operation; EZ-mount design; Ballast is enclosed & mounted on tray with safety tethers; 50"L x 6 5/8"W x 5 3/16"H; Cold start to -20°F; Uses F54T5HO replacement bulb; UL listed; Note: 220v & 240v units are available, please specify when ordering