Incandescent Bulb, Bulb Base Type Double Contact Index (BAY15d), Bulb Housing Glass, Bulb Shape S8, Bulb Finish Clear, Color Rendering Index 100, Color Temperature 2767K, Lumens 13 lm, Light Technology Incandescent, Shatter- No, Trade Number 7528 (P21/5W), Voltage 12V AC, Watts 5 W, 21 W, Bulb Beam Angle Not Applicable, Rated Life 1,500 hr, Dimmable No, For Enclosed Fixtures No, Three-Way No, Light Color White, Rough Service No, Indoor/Outdoor Usage Indoor Only, Overall Length 2 in