A sunbed (British English), tanning bed (American English) or sun tanning bed is a device that emits ultraviolet radiation (typically 95% UVA and 5% UVB, +/-3%) to produce a cosmetic tan. Regular tanning beds use several fluorescent lamps that have phosphor blends designed to emit UV in a spectrum that is somewhat similar to the sun. Smaller, home tanning beds usually have 12 to 28 100 watt lamps while systems found in tanning salons can consist of 24 to 60 lamps, each of 100 to 200 watts.There are also "high pressure" tanning beds that generate primarily UVA with some UVB by using highly specialized quartz lamps, reflector systems and filters. These are much more expensive, thus less commonly used. A tanning booth is similar to a tanning bed, but the person stands while tanning and the typical power output of booths is higher.Because of the adverse effects on human health of overexposure to UV radiation, including skin cancer, cataracts, suppression of the immune system, and premature skin aging, the World Health Organization does not recommend the use of UV tanning devices for cosmetic reasons. Most tanning beds emit mainly UVA rays — which increase the risk of melanoma, the deadliest form of skin cancer. Misusing a sunbed by not wearing goggles may also lead to a condition known as arc eye (snow blindness). Occasional acute injuries occur where users carelessly fall asleep, as in the case of Marty Cordova.