I see that Besthongkong is selling 5mm UV leds for around 15 cents each. That immediately creates an urge to put 50 or 100 of them into a box about the size of a largish paperback book. The way I envision it, the leds would be on a PC board (thus a reasonable quantity of the lights would have to be made to cover the board fab expenses) and the light would be powered by an internal NiMH pack, with a jack on the box to plug in a wall wart charger (included). So it wouldn't really be a flashlight and wouldn't be waterproof or pocketable, but it would still be portable and battery powered, probably weighing a pound or so. It would probably have to be in the $125 range because of the amount of assembly work involved.
Would anyone want such a thing?
Would anyone want such a thing?