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Light is 400,000 GHz to 800,000 GHz and has always existed on this earth. Man-made pulsed microwaves are 300 MHz to 600 GHz, and have never existed on this planet before.

Both from a physics standpoint, as well as from a biological standpoint, they are not the same thing.

Both are biologically active, but for one of them we have adapted (Vitamin D production and photosynthesis, for example), for the other we have not.

From another perspective; the FCC limit for for microwave radiation is 10^18 times higher than natural background. That's a difference of a quintillion times.

Backround levels (green), compared to current exposure: https://pbs.twimg.com/media/Dt2NMoJU4AE2oYY.jpg

Therefore you can't really compare visible light exposure with microwave exposure. One has existed on the planet for billions of years, the other is completely artificial and man-made, and unlike visible light it penetrates tissues through the whole body, and there is no adaptation.

https://www.thelancet.com/journals/lanplh/article/PIIS2542-5...