Westek LC06CLC Automatic Photo Control The Photoelectric light controls, in the Westek LCO6CLC 150W Outdoor Screw-In Light Control, sense light levels and automatically turn lights on at dusk and off at dawn so that you don"t come home to a dark house. It also simulates home occupancy to deter intruders, requires no seasonal adjustments as with timers, and saves money and energy too. Westek LC06CLC Automatic Photo Control Features: Compact, short stem fits smaller enclosed outdoor fixtures and post lamps Weather resistant Solid state circuitry For use with incandescent bulbs only, up to 150 watt capacity UL Listed 120 volt AC Short stem