Flipping through https://www.google.com/search?q=photoinitiator+absorption+spectrum&tbm=isch https://www.google.com/search?q=photoinitiator+absorption+sp... sug

Flipping through https://www.google.com/search?q=photoinitiator+absorption+spectrum&tbm=isch https://www.google.com/search?q=photoinitiator+absorption+sp... suggests that some photoinitiators work with 222nm UVC light. That wavelength is currently undergoing safety testing for killing germs. Maybe that's a possible alternative? Penetration depth might be an issue, since that's what (supposedly) makes it safe for skin.