GE Lighting 97573 Ecolux Biax T4 Bulb, Fluorescent, 1-Pack Compact fluorescent light bulb. Lasts up to 10,000 hours. 13-Watt GX23 Ecolux T4 White bulb with a color temperature rating of 2700K Lamp light illuminates your surroundings with light output of 825-lumens, great for natural, inviting lighting environments The 13-Watt Compact Fluorescent Light (CFL) acts as a replacement for 60-Watt incandescent bulbs, saving on energy and costs Using the 13-Watt CFL lamp provides about 10000-hours of rated running life, which means replacing bulbs less often