Comment by adrian_b
13 hours ago
The article mentions that unlike visible light, which is mostly absorbed by the skin, near infrared light penetrates deep into the body and the lowest frequencies of the Solar spectrum pass through the entire body.
This explains why most mitochondria are exposed to infrared light, even those deep in the body.
The article also mentions an inhibiting effect of blue and violet light upon mitochondria. For that it should be valid what you say, that this effect can happen only in the superficial layer of the body, because both skin and blood strongly absorb such light.
Even if that is true, we humans tend to have clothes on, and keep indoors. Considering that the sun is WAY brighter (several orders of magnitude) than fluorescent bulbs are, this still sounds implausible, if you compare it to just going outside for a while.