This CFL fits into mini base fixtures typically found in chandeliers, wall sconces, and some ceiling fan fixtures. At 9 watts, it delivers about 425 lumens of light and is equivalent to a 40 watt conventional bulb that it replaces. 8,000 hour average lifetime. Not dimmable. A little energy saved is money in your pocket and is better for the environment. 1.7"x4.4".