This handy light sensor provides extra security when you're away from home. Just screw into any candelabra light socket. A built-in photocell turns the lamp on at dusk and off at dawn. Not for use with fluorescent lights, appliances or other non-incandescent lights. Use with 25 to 75 watt incandescent lights. For upright use only. White finish. 1 1/2" high. 1" wide. For use with incandescent lights only. Rated for 25 to 75 watt bulbs only.