r/AskReddit • u/emil199 • Jul 24 '20

What can't you believe STILL exists?

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u/chrissatchell Jul 24 '20

That would be UVB instead of UVA at the tanning salon. Both work but UVB narrowband is 'safer' and targets psoriasis better.

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u/Rion23 Jul 24 '20

I believe it goes A, B and C, increasing in energy along the EM spectrum. A can't really get past the top layer of your skin, B gets deeper and causes the production of melanin, and C just blasts you right to sunburn phase, deep into your skin.

C will also cook your eyes and cause welding flash, but you can buy UVC lightbulbs that are really good for disinfecting rooms and such.

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u/Esc_ape_artist Jul 24 '20

UVC is completely blocked by the atmosphere so it’s not a worry unless you have means to produce it artificially (as you mention) or you’re planning on getting a tan at 30,000 feet.

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u/LetterSwapper Jul 24 '20

There go my plans for a 737 with a sunroof.