Has anyone found anything on the health implications of mounting 220nm lamps [1] indoors, beyond the issue of damaging human DNA? In other words, if you assume those lamps to be safe to living cells due to the light not penetrating beyond the first layer of dead skin cells, what other problems might there be?
Our skin surface contains a lot of living bacteria. Different strains seem compete with each other, and for example an overgrowth of staphylococcus aureus seems to be correlated with skin issues. In that sense living bacteria protect our skin. How would an far-UVC 'antibiotic' lamp influence bacterial repopulation later? Either on skin and in spaces. Would it impair immune system development?
Viruses seem far more fragile than bacteria, so perhaps a low-power far UVC-lamp will be enough to kill viruses but leave the bacterial populations on skin and objects intact