In the article it talked about light being absorbed mainly through the eyes, but in a clinical setting it appears that the blood circulates, leaving the body going through an ultraviolet light tube that irradiates the blood and returning it to the body. Now there is a bit of a difference of opinion with Dr Peat on this issue in that they talk about the full spectrum of light being utilized not just the red part of the spectrum.
Author
J.R.K