High Pressure Sodium HID Bulb, Bulb Base Type Mogul Screw (E39), Bulb Dia. 3 1/8 in, Bulb Housing Glass, Bulb Shape E25, Color Rendering Index 21, Color Temperature 2100K, Lumens 135,000 lm, Light Technology High Pressure Sodium, Overall Length 15 in, Shatter- No, Voltage 275V, Watts 1,003 W, Bulb Beam Angle 360 Degrees , Bulb Finish Clear, Rated Life 24,000 hr, ANSI Code S52, Dimmable No, For Enclosed Fixtures Yes, Bulb Operating Position Universal Burning