These are 395 nm UV lights. They are about at the end of the spectrum of UV light and moving into white light. The lower the nm the better the UV detection. All 395 to 400nm UV emit too much white or visible light and are close to useless.
375nm and lower are better at detection but harder to find.
A single led UV rated at 375nm will out perform a 51 led rated at 395nm.Get more detail about 395 nM UV Ultra Violet 21 LED Blacklight Flashlight, 7305UV395.
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