Sunlite 00665-su sl23/e/gu24/27k 23w 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 100 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 star certified 23 watt 2700k, gu24 base bulb offers 1600 lumens of light output and has an average rated life of 10,000 hours.