GE Lighting 63506 Energy Smart Bright CFL 20-Watt (75-watt replacement) 1100-Lumen A21 Light Bulb with Medium Base, Soft White, 2-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 A21-shape (similar to regular incandescent) and rated life of 8000-hours Saves Energy - similar luminosity (1100-lumen output) as standard 75-watt but uses only 20-watt Lumen is the new Watt - Better technology provides the same amount of brightness(lumens) while using less electricity(Watts)