GE Lighting 97600 (4-Pack) F18DBX/835/ECO4P 18-Watt CFL Plug-In Double Biax Ecolux Light Bulb. 3500K, 1250 Lumens, T4 shape, G24q-2 4-Pin Base Color/Finish: Natural Color Temperature: 3,500K Lumens (light output): 1250 Average Lifetime: 12,000 Hours G24q-2 4-Pin Base