nail UV gel with UVC curing would be terrible for skin over time
UVC is ionizing radiation like X and Gamma Rays
You may joke ,
But what if the corona virus is wearing a mask packed full of toilet paper for extra protection?
A UV light is not a safe way to sterilize my hands after I have been in public.
and its not the inside of my car, nor the inside of my house that are actually the vector source of coronavirus
Here is a UVC device I use at home, but it is not for coronavirus vectors:
the source vector for CoronaVirus is other humans I come in contact with when I leave home. Mainly from their hands and moisture from their mouth.
I have alcohol in a spray bottle, in my car
I spray my hands before driving home
and I dont touch my face after I have been out of the house, before sterilizing my hands.
I have also stopped shaking hands with people.
fwiw
I googled whether alcohol kills corona, apparently yes:
“_Emily Landon, an infectious diseases specialist at the University of Chicago Medicine, said the CDC recommendation for hand sanitizers is based on the fact that *60% alcohol kills “all of the coronaviruses we know about.*_”
Gotta admit, that light looks pretty cool in purple 
they claim to got 254nm LEDs?
those will be a lot more effective than 275nm to kill biotic material (skin, eye, maybe Corona virus)
the factor from 285 to 275nm is about 5-10 times more deadly, not sure what then 254nm will be compared
If anyone is interested, here is a post I made about UV-C bulbs:
not sure how light can do the job though
what about shadows?
wle
leds of 254 or lower, prbly not yet. tubes are plenty. 240nm and lower create ozone, it goes thru clothing and disinfects a lot more than just a surface, but you can’t breathe ozone, i mean you can but it is not good for lungs, you need to ventilate the room, but such light works the best.
Can 253.7 and similar wavelengths go through glass? Is it safe to view a UVC bulb through a 1/4 piece of glass?
No expert here, but NO. Polycarbonate safety glasses are recommended for blocking some wavelengths. But this is something that needs research or a knowledgeable member speaking up. But please be safe.
I found this on the internet, cant find it discussed commonly
Use of safety goggles and gloves is recommended as a precaution during installation to protect the eyes and skin. UVC light cannot pass through glass. There is no harm to look through an air handling unit access window at UVC lighting.Apr
This topic is way over my head. UV light from the sun, UV from various applications, there are variables. If no one answers, you might post a thread with a title like UVC protection or something and include the range and power of your situation, just to insure your eyes are safe. But I do not know what I am talking about here.
thru quarts glass yes, regular glass not really, or you would be getting suntan behind windows, polycarbonate will stop anything below 400nm. acrylic 375nm
I was under the impression simple polycarbonate was not effective for 365nm, which contradicts your post.
And regular glass definitely lets UV pass, you can easily suntan behind windows.
what about this for things like phone and keys and headphones so I don’t have keep wiping them with lysol things.
Astrolux® MF01 Mini UVC Disinfection Flashlight 99.9% Sterilization Rate Phone Face Mask UV LED Sterilizer UVC Germicidal Light - Black
look if you turbo direct fet that boi it’ll die in mere seconds
Suntan is done by UVA, in tanning salons the tubes emit only UVA
The get protection from sunburns the skin needs to be exposed by UVB, so even with tanning salons brown skin you can easily get a sunburn
UVC is the evil radiation that ionizes and let DNA decay damaging the skin very badly, UVB or UVA also does it but a lot less
I find it terrifying that UV-C flashlights are or were offered. Hope those are only fake.
i doubt that battery power puts enough light power out, to do anything, including damage to human skin or corona-stuff
A battery powered UV-C LED can cause enough damage to your skin and eyes.