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Ultraviolet (UV) LEDs emit light energy in the near UV range commonly known as "black light." Flashlights utilizing UV LEDs are used for detection of inks, dyes, and other materials that fluoresce under UV light. Applications include: A/C refrigerant leak detection, adhesive curing, antique inspection, art forgery/repair tests, club hand stamp screening, fluorescent dye leak detection, glass inspection, body fluid tracing, ID and document verification, mineral lighting and identification, pet and pest stains, reading invisible fluorescent inks, scorpion illumination, fruit spoilage, and freeze damage to orange crops, 365nm). We offer UV lights FOR PROFESSIONAL USE at two specific wavelengths: 365 nm and 375 nm. Do not confuse these with the typical, inexpensive "UV" (390-405nm) flashlights everyone else sells (us included, see CSI lights); these are TRUE long-wave UV. Please note that UV fluorescent materials will react at different wavelengths.