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Yes, it's drawing heat from the environment: the diode itself gets cooler as it emits light, and presumably at some point there's no more available energy in this way and so efficiency goes back below 100%

Which is still amazing. An issue with high power LED is cooling. If this can be turned into a product, it solves the issue in the best possible way.

It can't for high power LEDs.

What if you point light into solar panel and use the power for LED..?

Or point the light to space for a space cooler (IIRC I've read about something like this before).

I think it is analogous to setting your tap to a teeny tiny amount of "on," and in doing so you entrain the existing droplets in your tap to fall out.

Yep. It's taking environmental heat energy alongside electricity and converting to light.

Sundiver! Holy shit David Brin was right?

Exactly, it consumes heat.

> ... took advantage of small amounts of excess heat to emit more power than consumed.