[MikeOfAu]

The article makes no mention of Photobiomodulation (and there’s no mention in these comments at the time of writing).

And that's odd. Because that's the HUGE idea here. Yes, there are concerns about the harms associated with the UV end of the spectrum. But there are also the massive benefits from the Near Infrared (NIR) end.

Certain NIR wavelengths, around 810nm to 850nm, penetrate up to 5cm into the body and have a dramatically positive effect on mitochondria, creating the most powerful sub-cellular antioxidant (melatonin) to manage Oxidative Stress. This is well-established science now. Indeed, the exact mechanism is known (cytochrome c oxidase, etc).

It turns out that for good health it helps to be exposed to the Sun (and specifically NIR). We're more plant than we realise (a different mechanism obviously).

And, if you think about it, how on earth could we have not evolved to take advantage of the “free” energy provided by the Sun, particularly the NIR part of the spectrum which actually delivers about half of the energy.

Here's an explanation from MedCram: https://www.youtube.com/watch?v=5YV_iKnzDRg&t=2878s