Good point. I'm sure it has a lot to do with dosage and intensity. If near IR stimulates more activity in mitochondria (the purported mechanism here), that indi

Good point. I'm sure it has a lot to do with dosage and intensity. If near IR stimulates more activity in mitochondria (the purported mechanism here), that indicates there are some proteins or other compounds sensitive to that wavelength. It then stands to reason that large dosages at high intensity over prolonged periods can stimulate so much as to cause dysfunction, aka glass glower's cataracts. Looking into the sun isn't healthy for your eyes either, for instance.