Luxrite LR20285 (4-Pack) CF13DS/835 13-Watt Single Tube Compact Fluorescent Light Bulb, Natural White 3500K, 825 Lumens, GX23 Bi-Pin Base Luxrite Compact Fluorescent Light Bulbs meet all your lighting needs while saving you on energy costs. Color/Finish: Natural White, Color Temperature: 3,500K Lumens (light output): 825 Average Lifetime: 10,000 hours 2-Pin GX23 Base