WebSep 23, 2024 · First, the rays need to be at the correct wavelengths for the target virus. While this usually depends on the specific organism, anywhere between 200-300 nm is “considered germicidal” with peak effectiveness at 260 nm, says Malley. They also need to be at the proper dose — UV intensity multiplied by the amount of contact time, he explains. WebMar 1, 2024 · Can black light detect germs? Is it safe to leave a black light on all night? If however, long periods of time is spent being exposed to direct UV-A light; such as tanning beds, some studies suggest that it can be linked to cause skin damage. This is unlikely in the short term, one off black light party scenarios.
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