Venture MP320W/BU/ED37/UVS/PS/740 320 Watt Pulse Start Clear Metal Halide Lamp - 320W ED37 Uni-Form MP320 - EX39 Mogul Base - ANSI M154/O - Venture 21714 Fixture: Open Rated Temp: 4000K Ballast Type: M154/O M132/O - Pulse Start Base: EX39 Exclusionary Mogul Base Shape: ED37 Clear