[brink]

What's more interesting is how much energy there is in just that screen's surface area of sunlight. Enough to turn sand molten in under a second. Thinking of just how far away that is from the sun, and how much more surface area there is in a sphere with a radius that size..

[huuu]

A laser of 20-100 Watt is enough for Selected Laser Sintering.

So a square meter lens for the sun will give you more than ten times the power professional SLS printers are using.

That is indeed a lot.

Edit: here a nice answer about the heat generated: http://physics.stackexchange.com/a/103039

[baddox]

I believe you can get around a kilowatt per square meter, obviously depending on latitude, weather, and other factors. That lens looks about like a square meter.

[seiferteric]

*Kilowatt/m^2

[baddox]

Yeah, that's the prefix I was looking for.