I realized that the #LED in this $1 solar yard light can be swapped out with my own. Here it's been replaced with a UV LED, which can drive fluoresence or charge a glow in the dark element
Another arrangement, this using uranium glass rather than a fluorescein solution. I tried using an autocycling 3 color LED, but was disappointed that it seemed stuck at flat red
Another arrangement, this using uranium glass rather than a fluorescein solution. I tried using an autocycling 3 color LED, but was disappointed that it seemed stuck at flat red