Sylvania 21135 (4-Pack) CF13DS/850/ECO 13-Watt Single Tube Compact Fluorescent Light Bulb, 5000K, 800 Lumens, 82 CRI, T4 Shape, GX23 Bi-Pin Base Color/Finish: Bright White Color Temperature: 5,000K Lumens (light output): 800, 82 CRI Average Lifetime: 10,000 Hours GX23 Bi-Pin Base