I just posted detailed instructions for the construction of a high-power (10W) flashlight that has interchangeable LED heads to produce UV, IR, or visible illumination. The URL is http://www.prutchi.com/2012/04/27/d-i-y-high-power-swappable-head-uvirvisible-led-flashlight-with-intensity-control/#more-1091
Telling Apart 365 nm from 395 nm Ultraviolet LEDs and Flashlights
Today I received an UltraFire WF-502B UV flashlight advertised as emitting at 365 nm. I was wondering how to tell if it really does, especially since vendors commonly list it as emitting 365-400 nm. Well, I was in Canada last week, and had $25 Canadian left over in my wallet, so I tried this flashlight and compared it to
