Do you have to use UV light for SNS?

Could you elaborate on the necessity of using UV light for SNS? Is it a universal requirement, or does it depend on the specific situation or type of SNS being utilized? Is there a potential risk or downside to not using UV light for SNS, and if so, what are they? Additionally, could you provide any insight into the advantages or benefits of incorporating UV light into SNS procedures, if any? I'm genuinely curious about the role UV light plays in SNS and would appreciate your detailed response.