Energy efficient. Electronic circuitry for long life and dependable sub-zero weather operation. Automatic dusk-to-dawn operation, instant on flicker-free operation. Lens selections allow constant on or off option. Fully assembled. Weatherproof polycarbonate case and lens made of GE Lexan. Uses replacement 13W (2) pin biax bulb, included. Refer to Model No. 14583 (SKU 516783). Equivalent incandescent wattage, 60W. UL listed.