Sunlite 00789-su sl13/gu24/50k 13w gu24 spiral cfl light bulb, gu24 base, super white sunlite gu24 spiral compact fluorescent lamps fit into most energy efficient gu24 fixtures and give off a super white light much like a 60 watt incandescent bulb. These energy efficient cfl lamps can last up to 9.1 years with normal household use of 3 hours a day. This energy saving 13 watt 5000k, gu24 base bulb offers 900 lumens of light output and has an average rated life of 10,000 hours.