And a word of thanks for your assistance - I know I've asked you quite a few questions over these past two months! I appreciate the assistance you've provided. Particularly, the guidance around the wireless LED driver coils.
Using foam clay I constructed 'magic magnifying wands' that activated the wireless LEDs. The handle component was a 5V USB power supply. I then coated the whole thing in polyurethane and they've stood up really well to being wiped constantly in a hospital environment. It's been a wonderful moment of delight for the kids! In the photo below, one of the wands is in the bottom left corner.