EarthTronics CF11SW1B24 11-Watt 2700K Spiral Compact GU24 Florescent Light Bulb, Soft White, 12-Pack Save money and the earth-this bulb only uses 11-Watts of power and outputs the equivalent light of a 40-Watts incandescent bulb Use in high efficiency fixtures and fan lights 10000 hour average rated life means you'll almost never have to change bulbs Utilizes an advanced electronic ballast so the bulb reaches full brightness quickly 7 year limited warranty based on normal residential usage (3 hours average usage per day/7 days per week)