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UVA
- The tanning ray. Longer wave just beyond our visible range (thus, ultra-violet, just beyond violet in the rainbow). It is what actually does the tanning.
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UVB
- The burning ray. Medium wave that is just smaller than UVA. It stimulates your skin to produce melanin, which aids in tanning. It is what actually gives you a sunburn if you get too much. Overused as a rating for tanning lamps.
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UVC
- Not used in tanning. Short wave that is used selectively to sterilize medical instruments. It is quite unhealthy for humans and is filtered out of tanning lamps.
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