Spartan
(Spartan)
2
I don’t think that there is a “safe” recommendation other then the simplest “light source” with a fixed, glued on diffuser.
The problem will be that they will “play” by pointing at each other…or stare at the beam. Or bring it to their eye so they can see inside that magic beam.
You are the only one that can determine their maturity…and then devide it by ten because…they are children.