Well, l played around with the LED idea, and it works, but only with small, clear LED's, (the larger and colored ones are duds).
In light, (or in my case a artificial) it creates about .20 volts, (one LED) and about .02 in darkness, so several of these A4 panels, (with a few thousand on each) in your house could power it, indefinitely.
Or 70 mini LEDs should create about 12 volts, at night and 300 volts during the day, so yeah, these things are dangerous, so take precautions.
And the home one you are looking at thousands of volts in direct sunlight, and about 300 volts at night.
So l am going with building one, and keeping it inside only, so it safely makes power 24/7.
I know he quoted about 150 volts per panel, and maybe my maths is out, or maybe the LED is different or more efficient than his ones?
But it works, and is far easier to build than a Tesla-circuit, (on this forum) which requires a field of poles and electronics to power a house.