Here is the deal, though. People, because they are retarded, are going try and use this on EVERYTHING. While this form of light does great at killing germs, shielded exposure (because some fucktard is going to do it) can really fuck up eye tissue. That's why it's used in closed cabinets, closed portions of HVAC, closed portions of water devices (some bottles have this feature) and ice makers, etc. In a closed system, it's awesome. Be wary of "tricked out" improvised devices used by Karens to make a light gun of sorts to spot clean areas. Maybe I am over exaggerating the risks, but it might be prudent to get a nice pair of sunglasses that block UVC, just in case?