The (365nm) ultraviolet light engine is constructed and functional. It was a bear getting it the right power. Next stops: testing in a magic lantern and then in the dlp video projector I already converted to accept it. It’s still getting hotter faster than I’d like, even with the 12v Noctua fan. I know that ideally it’d have a copper heat sink, but the way the LEDs are mounted on tiny PCBs makes that difficult (I don’t want to strip them off and remount).