Luxrite LR20465 (2-Pack) PL-L40W/835 40-Watt Twin Tube Compact Fluorescent Tube Light Bulb, Natural 3500K, 3300 Lumens, 2G11 4-Pin Base Luxrite PL-L40W 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: 20,000 hours Lumens (light output): 3300 2G11 4-pin base