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 the fluorescence produced by an Inova X5MT-UVT 400 nm flashlight. Much to my surprise, the 365 nm UltraFire caused fluorescence that did not show up at all under the Inova 395 nm flashlight. Continue reading