Luxrite LR20655 (4-Pack) MH150/U/ED17 150-Watt HID Metal Halide Light Bulb, Cool White 4000K, 12000 Lumens, E26 medium base Color/Finish: Cool White Color Temperature: 4,000K Average Lifetime: 12,000 Hours Lumens (light output): 12000 E26 medium base