Incandescent Bulb, Bulb Base Type Miniature Bayonet (BA9s), Bulb Housing Glass, Bulb Shape T3-1/4, Bulb Finish Clear, Color Rendering Index Not Applicable, Color Temperature 2400K, Lumens 42 lm, Light Technology Incandescent, Shatter- No, Trade Number 1818, Voltage 24V AC, Watts 4.08 W, Bulb Beam Angle Not Applicable, Rated Life 250 hr, Dimmable No, For Enclosed Fixtures No, Three-Way No, Light Color White, Indoor/Outdoor Usage Indoor Only, Overall Length 1 3/16 in