GE 97588 (4-Pack) F13DBX23/835/ECO 13-Watt Quad-Tube Compact Fluorescent Light Bulb, 3500K, 810 Lumens, T4 shape, GX23-2 bi-pin base Color/Finish: Natural Color Temperature: 3,500K Lumens (light output): 810 Average Lifetime: 10,000 Hours GX23-2 Bi-Pin Base