The Best Ultraviolet LED Flashlights Of 2012

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Ultraviolet light is a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nanometers to 400 nanometers. LEDs that emit ultraviolet light were introduced in 2006, and there are now ultraviolet LED flashlights available. These flashlights are most often used to detect fraudulent documents, see watermarks, read invisible ink […]

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