I mentioned before that I was going to show a video of burning something, in this case cardboard, with the solar cooker. Well here it is.
It is amazing how fast the cardboard starts to smoke and with in seconds is showing visible flame.
If you look close you can see that one of the handles on that pot has been turned to white ash. The heat is amazing. I am going to measure the area of it but I bet it is producing more than 1000w of heat.