A 100 W LED has enough power to burn stuff. And this is “cold” light with no infra red at all.
“Continue reading” for details about burning with an LED. 6 photos.

I have a black cloth on the unfocussed output. LED safety 101. Do not stand next to a LED with your remaining black tee shirt.
Can I do better?

Above: Apparently I can do better.  Here is a CD case with a hole burnt through with the 100 W LED.

Above: The setup. I have a styrofoam surround to prevent the cooling fan from cooling the target.

Above: It took 1:45 mins to make a hole, but my heatsink fan was also cooling the target a bit. I augment my batteries with a power supply to keep up near rated power.

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Photo date: April 10-15, 2009