Highlights: 23 Watts Brite White color Overall length 4.8" 1 Piece - Screw-in 1600 Lumens Avg Life Hours: 8000 Medium base Mini-twist bulb Save energy costs by replacing incandescent bulbs with fluorescent equivalents Electronic ballast; instant on, no flicker. 13 watt, 4.3" overall length, 800 initial lumens Replaces 60 watt. 18 watt, 4.6" overall length, 1100 initial lumens, replaces 75 watt 4.8" overall length, 1600 initial lumens, replaces 100 watt. FCC approved Energy star approved, UL Listed