Powerful energy saver - uses 73% less electricity. Advanced photodiode technology. Automatic dusk-to-dawn operation. 27W quad fluorescent bulb gives as much light as a 100W incandescent bulb. Lexan housing is stronger than metal, rustproof, and shockproof. 27W/120V. Dimensions: 10" H x 7.5" W x 4.5" D. Refer to Model No. 9024B (SKU 530565) or equivalent for replacement 27W quad fluorescent bulb. Equivalent incandescent wattage, 100W. UL listed.