GE 18708 MPR400/VBU/HO/O 400-Watt Metal Halide Light Bulb Ideal for general purpose Lighting commonly used for residential and commercial applications Average life: 6000 hours Color Temp: 4000 kelvin Color rendering index: 65 ED37 shape with Mogul Screw (EX39) base Uses 400 watts Provides 40000 lumens Lasts 20000 hours 3400K light appearance