Sunlite 00660-su sl18/e/gu24/27k 18w gu24 spiral cfl light bulb, gu24 base, warm white sunlite gu24 spiral compact fluorescent lamps fit into most energy efficient gu24 fixtures and give off a warm white light much like a 75 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 18 watt 2700k, gu24 base bulb offers 1200 lumens of light output and has an average rated life of 10,000 hours.