Quartz Metal Halide HID Bulb, Bulb Base Type Mogul Screw (E39), Bulb Dia. 4 3/5 in, Bulb Housing Glass, Bulb Shape ED37, Color Rendering Index 65, Color Temperature 4000K, Lumens 36,000 lm, Light Technology Metal Halide, Overall Length 11 1/2 in, Shatter- No, Voltage 135V, Watts 400 W, Bulb Beam Angle 360 Degrees , Bulb Finish Clear, Rated Life 15,000 hr, Dimmable No, For Enclosed Fixtures Yes, Bulb Operating Position Universal Burning, Standards 4-39/64 in, Trade Number M400UED37