Purchased these for a number of different projects that I needed some UV/Black Light for. I haven't made it through the bag yet, but haven't hit a "dud" yet. They all work as expected, and actually put out quite a bit of light from a single CR2032 without any other kind of circuitry or work. For what they cost, 100 UV LEDs is a no brainer, even if you don't need 100 of them right now, put them in your kit! They also sell other colors as well.
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