The differences between the UVA and UVB that reaches us from the sun versus the UVA and UVB we receive from tanning equipment?
The actual UVA and UVB waves are the same. The differences is in the fact that many variables affect the dosage of UV waves that reach us from the sun. These variables, such as atmospheric conditions, are not a factor in the tanning salon. Additionally, equipment is designed to emit a precise amount of each type of UV light wave.