In this article they are talking about using red 630nm and near infrared 805nm light to stop short and long term brain damage in stroke patients. The light is capable of penetrating the skull into the brain. They are experimenting with pulsed light hoping for deeper penetration. I wonder why they aren’t just using longer wavelengths of infrared which would certainly penetrate deeper. They mentioned the the cells they are targeting have a peak absorption at 630nm red and 805nm infrared, but if the damage is deeper than those wavelengths can penetrate, wouldn’t less than peak absorption be better than nothing?
Anyway, I hope they get this all worked out and make this treatment available to all soon.