Luxrite LR20725 LU400/ED18 400-Watt HID High Pressure Sodium Light Bulb, Warm White 2100K, 50000 Lumens, E39 mogul base, 1-Pack Color/Finish: Warm White Color Temperature: 2,100K Average Lifetime: 24,000 Hours Lumens (light output): 50000 E39 mogul base