Sunlite MH1000/U/BT56 03681-SU 1000-watt Metal Halide Bulb with Mogul Base, Clear 1000-Watt, 110000 Lumens 12,000 Hour Average Lamp Life BT56, Clear Finish.HID (High Intensity Discharge) bulbs need an HID ballast to power on Mogul (E39) Base, 7.08-Inch MOL MH1000/U/BT56