Philips 36872-0 (4-Pack) LU100-C100S54/ALTO 100-Watt High Pressure Sodium HID Light Bulb, 2100K, 10000 Lumens, E39 Mogul Base Color/Finish: Clear Color Temperature: 2,100K Average Lifetime: 24,000 Hours Lumens (light output): 10000 E39 Mogul base