Cool idea. I wonder if anyone has tested thresholds for intensity or various lights/beams to do this. It probably takes less light than you'd think you just need to collate the beam properly into whatever magnifying glass you have. A good magnifying glass is important here I imagine. I wanna try this with my E50.... now I just need a magnifier lol.
What are averages for intensity for the sun? I know it varies greatly, but so many lights these days can achieve that intensity close up I'm sure. Especially focusing that intensity even further with an optic.
LOL now evil little boys can fry ants at night too with expensive flashlights.