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Amazon with Loftek has the 21-LED 395nM UV Flashlight for $7 with free shipping on $25+. Runs on 3 AAA batteries and measures 3.5".
$7
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It takes 51 LEDs to produce 395nm on the other cheapos, so I don't know about this.
^ ? ?
395nm is the wavelength of the UV light, it could be done with 1 LED or a million.
For example, http://www.amazon.com/Parts-Express-Ultraviolet-5mm-395nm/dp/B000F7P7E2