Atron Automatic Photo Control Switch for Incandescent Bulbs, On at Dusk/Off at Dawn, PL100, Black Base Turns lights ON at Dusk and OFF at Dawn. Weather resistant for outdoor usePorch lamps, patio lights, lamp posts, driveway lamps, etc. Simply screw into existing light base then screw incandescent bulb into the unit. Ideal for Table lamps, Floor lamps and Porch lamps, etc Easy Energy-saving security unit. For incandescent bulbs only! 150 Watt maximum