HID Metal Halide Lamp, Designation: MH400/ED28/U/4K/E39, 400 WTT, ED28 Shape, E39 Mogul Base, Clear, 20000 HR, Lumens: 36000 LM Initial, 4200 DEG K Color Temperature, Cool White 65 CRI, 8-5/16 IN Length, 3-1/2 IN Diameter, Burn Position: Universal