Things you can do with diodes

Also missing solar heating from diodes:

> This topic seems to be broadly misunderstood. It is 100% verified fact by both myself and others (including university researchers) that diode strings can produce more heat (or watt-hours, BTU) from a given solar panel than a bare resistance element.

https://www.youtube.com/watch?v=42XIbHA9Dv0

Intriguing, but wouldn't it be even more efficient to just paint something black and let the sun heat it directly?