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Not really relevant. The point underwater is NOT to have a UV light, but to excite the fluorescence ....which works better in the violet, which is why the yellow filter is needed on the receiving end to block the blue so all you see is the fluorescence.Just one mention - about wave length...
There is not a one UW light... Blacklight - Wikipedia
at least you have 400-380nm light (more used in Wood`s lights) - with bright violet light striking
You can stop it by UV black filter to get "True black light"... but
There is another 356 nm light. you can use this lamps... it should be much better.
Which is better: a 365 NM flashlight or a 395 one? - Quora
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