Illegal bicycle lights, so powerful they burn paper!

[Andy_R]

View: https://www.youtube.com/watch?v=N7nJ3wIxt3o


(but the video is a fake)

you're not focusing visible light to cause the heat, you're focusing infra-red wavelengths

 

[Andy_R]

Ever put your hand near a lightbulb?

Incandescant lights produce light by heating up a filament (exactly by the same way that setting fire to wood produces heat and limited light - very inneficient for lighting but great for heat). LED's dont. LED's have a very narrow wavelength compared to incandescants - I don't think the wavelength actually goes into infra red for white LED's so even with a magnifying lens this is most likely impossible. All it would do is focus the visible spectrum wavelengths.

 

[400bhp]

The OP's name would suggest he was riding a unicycle at the time.

Whilst juggling balls and with a rather large red nose no doubt.