Incandescent Bulb, Bulb Base Type Single Contact Bayonet (BA15s), Bulb Housing Glass, Bulb Shape R12, Bulb Finish Frosted, Color Rendering Index Not Applicable, Color Temperature 2700K, Lumens Not Applicable, Light Technology Incandescent, Shatter- No, Trade Number 1385, Voltage 28V AC, Watts 20 W, Bulb Beam Angle Not Applicable, Rated Life 300 hr, Dimmable No, For Enclosed Fixtures No, Three-Way No, Light Color White, Indoor/Outdoor Usage Indoor Only, Overall Length 2 5/8 in