Luxrite LR20305 (4-Pack) CF13DD/841 13-Watt Double Tube Compact Fluorescent Light Bulb, Cool White, 4100K, 900 Lumens, Gx23-2 Bi-Pin Base Luxrite Compact Fluorescent Light Bulbs meet all your lighting needs while saving you on energy costs. Color/Finish: Cool White, Color Temperature: 4,100K Lumens (light output): 900 Average Lifetime: 10,000 hours GX23-2 bi-pin base