Installs easily and provides dusk-to-dawn lighting instantly. Saves energy, adds safety and security to home or business. Use indoors or outdoors. Ideal for lamps, entryways, stairwells, hallways, lamp posts, patio lights, porch lights, and driveway lights. 150-watt maximum, 120V AC. Burn bulb base down. Incandescent and halogen compatible. UL (Underwriter's Laboratories) listed.