Metal Halide HID Bulb, ED17 Bulb Shape, Medium Screw (E26) Bulb Base Type, Metal Halide, 5,000 lm, Bulb Operating Position Universal Burning, 50 W, Trade Number MHC50/U/M/4K ELITE, Rated Life 20,000 hr, Standard Bulb Type, 4200K, 360 Degrees Bulb Beam Angle, 2 1/8 in Bulb Dia., 5 1/2 in Overall Length, Shatter- No, Bulb Finish Clear, Color Rendering Index 85, Bulb Minimum Starting Temperature -40 Degrees F