Pulse Arc Metal Halide HID Bulb, ED23-1/2 Bulb Shape, Mogul Screw (E39) Bulb Base Type, Metal Halide, 17, 500 lm, Bulb Operating Position Vertical Base Up +/-15 Degrees, 175 W, Trade Number MVR175/VBU/PA, Rated Life 15, 000 hr, High Output Bulb Type, 4200K, 3 in Bulb Dia., 7 1/2 in Overall Length, Shatter-Resistant No, Bulb Finish Clear, Color Rendering Index 75