Luxrite LR20645 (4-Pack) MH70/U/ED17 70-Watt HID Metal Halide Light Bulb, Cool White 2100K, 5500 Lumens, E26 medium base Color/Finish: Cool White Color Temperature: 4,000K Average Lifetime: 12,000 Hours Lumens (light output): 5500 E26 medium base