welding light is broad-spectrum, so it's not relevant when comparing to a narrow-peak light source. > UV-C As Potentially Mutagenic/Causing Damage not caught b

welding light is broad-spectrum, so it's not relevant when comparing to a narrow-peak light source. > UV-C As Potentially Mutagenic/Causing Damage not caught by normal replication suppression mechanisms - [https://pubmed.ncbi.nlm.nih.gov/9951833/ https://pubmed.ncbi.nlm.nih.gov/9951833/] p53-/- human keratinocyte cell line means that those were in vitro experiments which don't account for the wavelength-dependent penetration depth, which is the point of discussion here.