Philips C400S51/ALTO Bulb

High Pressure Sodium HID Bulb, ED18 Bulb Shape, Mogul Screw (E39) Bulb Base Type, High Pressure Sodium, 50,000 lm, Bulb Operating Position Universal Burning, 400 W, Trade Number C400S51/ALTO, Rated Life 24,000 hr, Standard Bulb Type, 2100K, 360 Degrees Bulb Beam Angle, 2 1/4 in Bulb Dia., 9 3/4 in Overall Length, Shatter-Resistant No, Bulb Finish Clear, Color Rendering Index 21, Bulb Minimum Starting Temperature -40 Degrees F