Sunlite Blacklight Spiral Compact Fluorescent lamps are ultra compact, fit into most standard fixtures and give off a backlight blue light much like a 75 Watt incandescent bulb. These energy efficient CFL lamps can last up to 7 years with normal household use of 3 hours a day. This Sunlite Energy Saving 20 Watt blacklight blue spiral CFL medium base bulb an average rated life of 8,000 hours. Very versatile and great for ambient lighting.