How many hours of natural sun does a 20 minute indoor tanning session equal?
It is difficult to make a simple comparison between the sun and modern indoor tanning equipment. Just as various kinds of indoor tanning lamps and equipment differ in spectral output and energy emitted, the sun’s strength is dependent on server factors as well, such as the time of day or year, the latitude, cloud cover, pollution and reflection. Consequently, there is no formula for relating indoor tanning exposure times to outdoor exposure times.
