Mercury Vapor HID Bulb Bulb Base Type Mogul Screw (E39) Bulb Dia 3 1/2 in Bulb Housing Glass/Metal Bulb Shape ED28 Color Rendering Index 50 Color Temperature 3900K Lumens 11 200 lm Light Technology Mercury Vapor Overall Length 8 1/4 in Shatter-Resistant No Voltage Not Applicable Watts 250 W Bulb Beam Angle Not Applicable Bulb Finish Frosted Rated Life 20 000 hr ANSI Code H37 Dimmable No For Enclosed Fixtures Yes Bulb Operating Position Universal Burning