Sylvania 20305 (12-Pack) CF9DS/841/ECO 9-Watt Single Tube Compact Fluorescent Light Bulb, 4100K, 580 Lumens, 82 CRI, T4 Shape, G23 Base Color/Finish: Cool White Color Temperature: 4,100K Lumens (light output): 580, 82 CRI Average Lifetime: 10,000 Hours G23 Bi-Pin Base