21–30 of 61 posts
Then there is the issue of whether UV light can kill airborne viruses soon enough after being exhaled so they are dead by the time someone else breathes them in.
If this will kill all bacteria and viruses, it would certainly also destroy the beneficial bacteria that forms our microbiome and that could have negative health effects in the long run. Has any research been done to check on this?
There's a lot of fake junk out there. The fake junk comes in two forms - UV lights that emit in dangerous parts of the spectrum, and UV lights so weak as to be at "homeopathic levels". Lamps that emit around 222nm are significantly more expensive than the wrong lamps.
Typical fake on eBay.[3]
Previously on HN: [2]
[1] https://www.nature.com/articles/s41598-020-67211-2
Because sterilizing lamp use UVC ( more than 250 nm ) that hare ionising radiation, they cause cancer in long / medium term and burn your eyes immediately. Recently I read about a party where "diversely intelligent people" used UVC sterilising lamps as light effect, with this result: https://www.msnbc.com/msnbc/msnbc/bored-ape-yacht-club-eye-b... This is not a scientific journal, anyway I read the article and it is m…
Because sterilizing lamp use UVC ( more than 250 nm ) that hare ionising radiation, they cause cancer in long / medium term and burn your eyes immediately. Recently I read about a party where "diversely intelligent people" used UVC sterilising lamps as light effect, with this result: https://www.msnbc.com/msnbc/msnbc/bored-ape-yacht-club-eye-b... This is not a scientific journal, anyway I read the article and it is m…
This is discussed at length in the article, so I'm surprised to see this top of the comment page. I suppose it flatters HN readers' view of themselves as smarter than journalists.
> “Upper room” UV, the primary form of UV disease control tested to date, is a kind of compromise. The primary wavelength it uses, 254 nanometers, is dangerous to human skin and eyes if directly blasted at them. So, well, you don’t blast it directly at them. The next best thing is to put the lamps high up in a room, where they can kill pathogens at that height and spare the humans.
> The problem is that you can’t safely shine conventional 254 nm light at humans, much less at the wounds of humans who are recuperating from surgery. So Brenner and his colleagues, thinking about the donor’s challenge, arrived at the idea of trying out shorter wavelengths, 207 nm or 222 nm far-UV. Those wavelengths penetrate far less than conventional UV, and because of that, far-UV seemed much less likely to damage human skin or eye cells, while still being strong enough to kill viruses and bacteria.
I just ordered a set to check them out for myself, although I don't know how I could possibly measure their efficacy in killing pathogens or their risk to humans.
Because sterilizing lamp use UVC ( more than 250 nm ) that hare ionising radiation, they cause cancer in long / medium term and burn your eyes immediately. Recently I read about a party where "diversely intelligent people" used UVC sterilising lamps as light effect, with this result: https://www.msnbc.com/msnbc/msnbc/bored-ape-yacht-club-eye-b... This is not a scientific journal, anyway I read the article and it is m…
> Ultraviolet light can kill almost all the viruses in a room. Why isn’t it everywhere? Simple--cost. Specifically, UV lamps require maintenance and can be dangerous to those doing the maintenance since the flux is large and damaging to humans. UV LEDs change this calculus slightly as they can last a lot longer, but they are still dangerous to maintenance people. The interesting question is whether the Far UVC (222nm…
[1] https://www.suntechleds.com/regular-led-strip/uv-led-strip-l...
Specifically this one: https://www.care222.com
At the end of the day it’s tutorial 1 in every arduino project, just replace the led with a far-UVC lamp.
Unfortunately the price is extreme, so very hard to commercialize.
I installed one in my entrance… I’m currently sterilizing my shoes :)
The concept is good [1], but the hardware is crappy. There's a lot of fake junk out there. The fake junk comes in two forms - UV lights that emit in dangerous parts of the spectrum, and UV lights so weak as to be at "homeopathic levels". Lamps that emit around 222nm are significantly more expensive than the wrong lamps. Typical fake on eBay.[3] Previously on HN: [2] [1] https://www.nature.com/articles/s41598-020-6721…