Sunlite 05515-su sl65/41k/med 65w spiral cfl light bulb, medium base, cool white sunlite high wattage spiral compact fluorescent lamps give off a cool white light much like a 300 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 65 watt 4100k, medium base bulb offers 3400 lumens of light output and has an average rated life of 10,000 hours.