Sunlite 05379-su sl25/3w/e/27k/cd1 13/20/25w spiral cfl light bulb, medium base, warm white sunlite 3 way spiral compact fluorescent lamps fit into most standard fixtures and give off a warm white light much like a 60/75/100 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 star certified 13-20-25 watt 2700k, medium base bulb offers 900/1200/1600 lumens of light output and has an average rated life of 8,000 hours. Great for floor lamps, desk lamps, ceiling fixtures and most common household lighting needs.