GE Multi-Vapor Metal Halide lamps feature sparkling white light, high operating efficiencies and long life. 65 CRI. 33,100 lumens. 4000K color temperature. Rated average life of 15,000 hours. 400 watt, 120 volt, ED37 E39 mogul screw base hight intensity discharge quartz metal halide lamp. 4.63 inch diameter x 11.5 inch length.