Sunlite 05479-su sl23/27k/d 23w dimmable spiral cfl light bulb, medium base, warm white sunlite dimmable spiral compact fluorescent lamps fit into most standard fixtures and give off a warm white light much like a 100 watt incandescent bulb. These energy efficient cfl lamps can last up to 7.3 years with normal household use of 3 hours a day. This energy saving 23 watt 2700k, medium base bulb offers 1600 lumens of light output and has an average rated life of 10,000 hours.