HID Bulb, Bulb Base Type Mogul Screw (EX39), Bulb Dia. 4 5/8 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-Resistant Yes, Voltage 120-277V, Watts 400 W, Bulb Beam Angle 360 Degrees , Bulb Finish Clear, Rated Life 20,000 hr, ANSI Code M59/O, Dimmable No, For Enclosed Fixtures Yes, Bulb Operating Position Vertical Base Up +/-15 Degrees , Rough Service No