People have written some very strange things about these and other UV light sources. This is a very handy to have and use UV light. Use it to check that money is real and also if you mark your property with a UV marker pen, you need a UV light source. These are perfect for those two. Anything else and ... Read more
does make a cool purple light that u can tell is UV but also high end visible light. left them on for 2 days and they still shine just as bight as they did wen i got them. i think CSI is exagerating wen they go over a room with a UV light. (yes i checked, it does show up blood .... and other substances ... Read more
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