Tool Using Animal shows you how to mod a flashlight with UV LEDs – good for mineral fluorescence, scorpion hunting and vaseline glass shopping.
“Danger Will Robinson, This is a UV mod for my beloved harbor freight flashlight So here comes the disclaimers. UV is dangerous, it’ll give you cancer, cataracts, and steal your check book, if you build this, You Will Die!! Although probably your death will not be related to this instructable. But seriously DO NOT shine this into anyone’s eyes.” – Link.