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LED is 50
I got to meet Professor H. this week and talk with him briefly. He’s still sharp as a tack and working to push his technology even further:
https://www.led50years.illinois.edu/
and
Besides advancing the state of the art in communications and lighting, doctors are finding that IR LED’s can actually speed healing in the body. There is an enzyme inside the mitochondria of your cells – the so-called “powerplant” of the cell – that shifts its energy production into higher gear when light penetrates thru the skin and hits the cells. In a certain IR range, LED’s efficiently activate this process, speeding healing and re-growth, flushing out cellular wastes and poisons, rejuvinating tissues and alleviating pain. No, this does not mean you should sunbathe using your camera’s light!;-)
It does mean we’re at 50 years with this tech and still learning the limits of what it might do.