The difference between UVA and UVB
UVA and UVB, whether produced by the sun or an indoor tanning unit, both contribute differently to your tan. UVA is a longer ray that penetrates the skin more deeply and slowly than UVB.
Melanin in your skin absorbs the uva rays, turning the pigment brown. UVB rays are short, intense waves of energy, stimulating melanocytes in your skin to produce the pigment melanin.
A sunbed utilizes a carefully formulated and controlled mixture of the two light waves, designed to tan you with a minimal risk of sunburn.
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