Why do blacklights look blurry/fuzzy?!
Question:
Why do blacklights look blurry/fuzzy?
Whenever I look at a blacklight, it seems impossible to focus on it. It looks really fuzzy and blurry. Why is that?
Answers:
Well black lights emit electromagnetic radiation that is almost exclusively in the soft near ultraviolet range, and very little visible light. In many areas this type of lighting is more commonly referred to as simply "UV light".
Seeing how most of the light it is emitting is not visible to the human eye that may be a part of the reason of why it looks fuzzy to you. Our eyes can see visible light in a spectrum ranging from red through orange, yellow, green, blue and violet. Above violet is ultraviolet light, which we cannot see.
I would be careful though, because Black lights emit UVA or long wave UV and too much exposure can be dangerous.
UVA although being less harmful then UVB can contribute to the aging of skin, DNA damage and possibly skin cancer. It penetrates deeply and does not cause sunburn. Because it does not cause reddening of the skin (erythema) it cannot be measured in the SPF testing. There is no good clinical measurement of the blocking of UVA radiation, but it is important that sunscreen block both UVA and UVB
:)