Luxrite LR20450 (6-Pack) PL-L36W/835 36-Watt Twin Tube Compact Fluorescent Light Bulb, Natural 3500K, 2250 Lumens, 2G11 4-Pin Base Luxrite PL-L36W Twin Tube Light is ideal for commercial fixtures in the office, retail, and general purpose use in your household. Color/Finish: Natural, Color Temperature: 3,500K Average Lifetime: 12,000 hours Lumens (light output): 2250 2G11 4-pin base