Incandescent Light Bulb, Long Life A-21, Long Neck, 10,000 Hours, 150 Watt, Clear 150 Watts, 120 Volts, Made in U.S.A. Shape: A21 (Length: 5 5/16", Diameter: 2 5/8") Finish: Clear Base: Medium (Brass) Life: 20,000 Hour