Incandescent Bulb, Bulb Base Type Single Contact Bayonet (BA15s), Bulb Housing Glass, Bulb Shape S8, Bulb Finish Clear, Color Rendering Index Not Applicable, Color Temperature 2700K, Lumens 189 lm, Light Technology Incandescent, Shatter- No, Trade Number 1591, Voltage 28V AC, Watts 17.08 W, Bulb Beam Angle Not Applicable, Rated Life 1,000 hr, Dimmable No, For Enclosed Fixtures No, Three-Way No, Light Color White, Indoor/Outdoor Usage Indoor Only, Overall Length 2 in