Sunlite 05571-su ap23/30k air purification spiral cfl light bulb, medium base, warm white sunlite purion air purification spiral compact fluorescent lamps fit into most standard fixtures and give off a warm white light much like a 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 saving 23 watt 3000k, medium base bulb offers 1500 lumens of light output and has an average rated life of 10,000 hours. Great for floor lamps, desk lamps, ceiling fixtures and most common household lighting needs.