EarthTronics 3W25SW1B 3 way 25-Watt 2700K Spiral Compact Florescent Light Bulb, Soft White Save money and the earth-this product only uses 13, 20, or 25-Watts of power and outputs the equivalent light of a 40, 75, or 100-Watts equivalent Use in table, floor and desk lamps 8000 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)