HID Metal Halide Lamp, Designation: MH1000/BT37/U/4K, 1000 WTT, BT37 Shape, E39 Mogul Base, Clear, 15000 HR, Lumens: 110000 LM Initial, 4200 DEG K Color Temperature, Cool White 65 CRI, 11-1/2 IN Length, 4-5/8 IN Diameter, Burn Position: Universal