Pretty much since the start of the COVID pandemic, Naomi Wu has been working to bring affordable high-quality far-UVC lights - deadly against pathogens, harmless to humans - to market.
I missed the product release announcement, but it’s alive! The devices output 222nm UVC for ~$150 per emitter. Each emitter is good for between 8 and 10m^3 of germicidal environment.
https://cybernightmarket.com/products/nukit-lantern-far-uvc-light
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@cmdrmoto I'd still don't consider #UVC harmless for humans.
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@kkarhan Reasonable objection; I don’t trust most UVC either. Cheaper UVC lamps tend to use 450+nm emitters which can give you a sunburn, damage your eyes, or worse.
These use a far-UVC 422nm wavelength which was specifically selected for its inability to penetrate skin and corneas. That’s exactly why these are so appealing (despite being objectively less powerful on the dollars-to-photons scale).
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@cmdrmoto granted, I have setup some UVC lamp in fishtank water system ages ago because that stuff can actually kill a lot of stuff in the loop and that stuff had all kinds of safety warnings, including the exlicit demand to never ever run it dry or use the light outside it's casing as it can permanently blind.one within seconds.
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@kkarhan
Generally UV-C, including the mercury line 253,7nm, is very bad for health, efficiently at damaging organisms, thats why they are used for disinfection in general
Its a lucky coincidence that around 220nm is a "window" of wavelenghts that are non longer penetrating outer skin to reach living cells, but also still not produce ozone
Its important that lamps have strict filters, otherwise they also emit dangerous UV!
Here is one good article https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5552051/
@cmdrmoto
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@Laberpferd @cmdrmoto Which is why people need to really read the SDS before buying, installing and using.
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@kkarhan
You are getting closer to understand it right
The lamp that @cmdrmoto has shown is exactly the safe filtered variant that is designed to be used to safely disinfect a room while humans are inside
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@Laberpferd @cmdrmoto I'm still not convinced re: safety vs. effectivity, since a effective desinfection would necessitate the unsafe level.
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@kkarhan
At this point i do trust enought in sources like the document from the "Nation Health Service" that i linked, and much more that i could also post, that have verified and accepted these lamps as "not harmful"
Have you read and understood this document at all? With their rxplicit comparision between filtered far-UV versus classic "kill all" UV-C
I do fully agree that "kill all" UV-C is close as dangerous as XRay but this discussion here is not about about these
@cmdrmoto
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@Laberpferd @cmdrmoto Okay, then I do need to take a look at said #SafetyDataSheet - as stated before...
Certifications in that regard OFC change things...
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@kkarhan
Exactly, these are two different kinds of lamps that have been optimized for very different purposes
Low-Pressure Mercury lamps are inexpensive; long lived and energy efficient UVC-Lamps that are great for "kill all" desinfections of unoccupied rooms and surfaces, as well as energy source for photochemical reactions
Dedicatedly filtered Far-UV excimer lamps are complicated and more expensive, but they have the unique oint of beeing skin and eye safe
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