Uses 75% less energy and last up to 12,000 hours for tremendous savings over the incandescent technology that Thomas Edison invented in the 1800's. Designed to work where the traditional light bulb was used—lamps, recessed lighting fixtures and enclosed lighting fixtures. Providing excellent color rendering, they are often favored for task lighting. IMPORTANT NOTE: Unless the CFL is specifically labeled to be dimmable, DO NOT use with a dimmer, or you can create a fire hazard.