Few people know or care about why this shorter wavelength activates this air and water sterilizing TiO2 anatase photocatalyst. The fact that anatase can reduce germs to CO2 and water is useful, and this color of light will do it. One can also split water into H-OH with TiO2 and 385nm UV. Other bandgap semiconductors will also become conductive under this color of light. So, one pays a bit more for a well made special light source that is in less demand but does something unique like this. Your eyes do not really see light of this color but see what it does. It pumps some minerals and dyes into fluorescence. What we can also see is that proteins glow so brightly that they are damaged by this light even in a single direct exposure. Your eyes can be easily damaged (retinal bleaching, coagulation, and cataracts) by this light and your dentist wears protective glasses for short UV, and we should too. Never look directly into artificial light sources or illuminate the eyes people or animals, even flashlights or with headlamps.
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