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

There are so many nice hacks in [Joekutz]’s retro LED display project that it’s hard to know where to start. There’s his DIY LED display controlled by an Arduino UNO.

Here are some of the coolest uses for LED lights we've seen around the house, along with instructions on how to make these LED creations yourself.