How to Make UV Light Out of Your Phone's LED Flash

In a recent episode of MacGyver, an improvised ultraviolet light was created from an LED. How would this work and what is a blacklight?

INOVA® X5® UV LED Flashlight

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LIGHTFE Black light UV Flashlight 365nm blacklight UV301D with LG LED Source,Black Filter Lens, Max.3000mW high power for Resin Glue Curing Light,

LIGHTFE Black Light UV Flashlight 365nm Blacklight UV301D with LG LED Source,Black Filter Lens, Max.3000mW high Power for Resin Glue Curing Light

Shortwave UV LED Flashlight (254nm UVC) - The Pocket Model – Stone Throne

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LIGHTFE Black Light UV Flashlight 365nm Blacklight UV301D with LG LED Source,Black Filter Lens, Max.3000mW high Power for Resin Glue Curing Light, Rocks and Mineral Glowing,A/C Leak Detector

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