The Bioluminescence of Humans

If Humans aren’t able to see the glow as stated in the above text, then who is able to see this glow? Yah and also the spirits. *This is partially how the demons know you or see you. The righteous glow brighter than the average human.* https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2707605/ Some humans glow more than others was also