Sylvania 21120 (4-Pack) CF13DD/841/ECO 13-Watt Double Tube Compact Fluorescent Light Bulb, 4100K, 780 Lumens, 82 CRI, T4 Shape, GX23-2 Bi-Pin Base Color/Finish: Cool White Color Temperature: 4,100K Lumens (light output): 780, 82 CRI Average Lifetime: 10,000 Hours GX23-2 Bi-Pin Base