[simoncion]

So, there's this: http://what-if.xkcd.com/145/

But there's also TheSpiceIsLife's opening comment which says:

> ...you're increasing the surface are of the collector so the 1.366kWh / square meter still stands.

It feels like your second sentence

> ...[H]owever you can use reflectors in the spectrum that your solar panel operates in to increase the energy available for capture at a focal point.

plays rhetorical games by ignoring the existence of large parts of your solar collector (namely the reflectors) in order to arrive at an inflated energy density figure.