UV Light Detector

Recently I bought some UV LEDs and they look just like regular LEDs, so to be able to tell the difference I printed this out of glow-in-the-dark PLA plastic which lights up under UV light. Since UV light is invisible to the human eye and also harmful to our eyes and skin it makes sense that if you've bought a UV light and want to be able to differentiate it from a purple light then this will be able to help.