R.J.
- a battery powered nightlight
- a light up stuffed animal (the one that comes to mind is that turtle one that projects the stars up onto the ceiling...but I'm sure there are others).
- a glow stick...with halloween around the corner (at least as far as the marketing people are concerned...glow sticks are everywhere right now).
You'll note the alternatives...because in my experience...once a fixation has started (casting shadows, playing with heat, playing with how it's plugged in) you can't really fix it, until they forget or become uninterested. Waiting for him to become uninterested is a wee bit dangerous when the fascination is electronic. So my best bet is let him cast shadows/play with the heat/light with something that ISN'T potentially deadly...He'll eventually get tired of these games...but it could take days or it could take months.