Hair restoration photon light therapy 39hair restorationrejuvenation photon light therapy red photon at 635nm penetrates into the cell at the exact depth causing cell division and rejuvenation this is caused by an increase in adenosine triosphate or atp within the cell atp is the energy generated and released by mitochondria that keeps cells and indeed us alive just like a car battery as long as atp is present there is energy or power where there is energy there is life in 100 of