Ushio 5001139 - UMH-1000/U/BT37 1000 watt Metal Halide Light Bulb HID Bulbs produce high output for their size making them a compact powerful &amp; efficient light source HID Bulbs are used for general lighting, professional lighting fixtures, growing applications HID bulbs put out around 3-5 times greater output (lumens per watt) than traditional halogen bulbs Ushio bulb, 1000W, Base: E39 Mogul Screw, Rated Life (hours): 12000, Color Temp: 4000K, Luminous Flux (LM): 105000