AERO-TECH TS103 Incandescent Bulb, A21, 100W. More details: Incandescent Lamp, Lamp Type A-Shape, Lamp Shape A21, Base Type Medium Screw (E26), 100 Watts, Max. Overall Length 5-5/16 In., Light Bulb Dia. 2-5/8 In., Lamp Finish Silicon Coated, Color Temp. 2800K, Average Bulb Life 20, 000 hr., 120 Voltage, Lamp Designation 100A21/TS, Shatter-Resistant Yes, ANSI Code TS103, Meets 2012 Lighting Legislation Energy, Incandescent, Bulb Power Source Direct Wired, Bulb Housing Glass, Bulb Start Type Rapid