GE Lighting 63503 Energy Smart Bright from the Start CFL 15-Watt (60-watt replacement) 800-Lumen A19 Light Bulb with Medium Base, 1-Pack Achieves full brightness the instant you flip the switch and uses 75-percent less energy than incandescent bulbs Lumens measure brightness of a light bulb, Watts measure electricity used to create light This CFL bulb has an A19-shape (similar to regular incandescent) and rated life of 8000-hours Saves Energy - similar luminosity (800-lumen output) as standard 60-watt but uses only 15-watt Lumen is the new Watt - Better technology provides the same amount of brightness(lumens) while using less electricity(Watts)