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Instructables user duesentrieb writes:

I like LEDs. And I like torches (flashlights). I have always been looking for a torch that combines all LED colours that I want, including infrared and ultraviolet. As this combination is hard to come by, or extremely sumptuous, I chose to build one myself using a cheap torch bought on eBay and some inexpensive parts.

Do not underestimate the effort of desoldering and soldering, though. It took me about a day altogether to finish the project.