Can Humans See Uv Light?

[bednobs]

And if not, what are you seeing in a backlight>

[bhg481]

Do you mean "BLACKlight"? If so, you see the UV light converted to visible wavelengths by whatever it falls on.

[bednobs]

so in general can humans see UV?

[Mamyalynne]

In general, no.

https://www.newscientist.com/lastword/mg24432591-000-super-seers-why-some-people-can-see-ultraviolet-light/

[bednobs]

thanks, I am in a discussion with someone about my toilet light (which BTW is the most fabulous thing in the world).
It gives you a few colours and after a few minutes, it supposedly puts UV light in the toilet.
she is saying she can't see it doing that. I maintain she wont be able to - who is right?

[bhg481]

Doesn't UV light kill germs? If that is the case perhaps your light emits UV + some visible light to help sanitise the toilet.

[Zacs-Master]

Just because you can't see UV light doesn't mean your toilet light isn't emitting it.

[bednobs]

that's my point zacs.
There are 2 bulbs - 1 for the disco colours and 1 for the UV.

[Mamyalynne]

I think the UV is sometimes emitted with blue making it visible.

[Zacs-Master]

Have a read of this, Bednobs:
https://www.bbc.com/future/article/20150727-what-are-the-limits-of-human-vision

[bednobs]

ok thanks all, we will just have to agree to disagree :)

[Mamyalynne]

A little more on lighting here.

https://www.sciencelearn.org.nz/resources/550-uv-and-lighting#:~:text=Some%20public%20toilets%20are%20lit,injecting%20drugs%20into%20their%20veins.&text=The%20lack%20of%20red%20in,the%20toilets%20for%20injecting%20drugs.

[Zacs-Master]

Strange how some people think they know better than proven science, ain't it.

[barry1010]

Where can I buy disco lights for my toilet?

[Peter Pedant]

Blimey I wdnt arriss around with UV light
The dazzling whiteness of sheets washed and drying in sunlight is meant to be UV. Insects deffo can but they have very different eyes

// https://my.clevelandclinic.org/health/diseases/15763-photokeratitis#:~:text=Your%20eyes%20can%20be%20damaged,don't%20damage%20your%20eyes.//

phosporescence and fluorescence both have articles on wiki
( take in UV light and give out coloured light)

[Peter Pedant]

Night clubs used to have UV lights - lit up your lenses ( the real one s in the eye) in what I thought was a most unhealthy fashion

then they were taken off the market
for rather obvious predictable reasons

[jim360]

No humans can see UV light. Anyone who claims they can is mistaken. It's out of our visible range. Same with infrared.

[bednobs]

barry here:
Amazon.co.uk User Recommendation
I cannot overstate how tremendous it is :)

[barry1010]

Haha

[jno]

how have I been without carousel mode for so long?

Of course I suppose the flashing lights let everyone in the street know what I'm doing.

[bednobs]

you may laugh but it really is lovely not having ti put the light on and wake yourself up at night