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FrozenGate by Avery

Are these uv flashlights safe for the eyes?

Razako

Razako

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http://www.dealextreme.com/details.dx/sku.10709
I have one of the above uv lights and whenever I use it for a short amount of time my eyes start feeling really tired and the light seems to mess with my ability to focus on stuff. My eyes do return to normal after I stop using the light and I'm wondering if you need some kind of eye protection for these lights. It seems just like any ordinary blacklight or blu-ray so I'm not sure what the problem is. I also notice people in the reviews complaining about it hurting their eyes.
 





The LEDs are probably in the 260-385nm range with plenty of bleed into the violet. Of course they don't say on the dealextreme website. The light is not coherent nor focused so there's no worry about UV burns to the cornea but I suspect you do get an optical response from the cornea and lens (both of which are opaque to UV). It would probably save many headaches and eyestrain to use a set of UV protective glasses since the fluorescence you are looking for is outside the UV range and would be visible while using UV protection.

You could use a set of UV blocking sunglasses or purchase a set of UV protective glasses, which are clear.
 
FrothyChimp said:
The LEDs are probably in the 260-385nm range with plenty of bleed into the violet. Of course they don't say on the dealextreme website. The light is not coherent nor focused so there's no worry about UV burns to the cornea but I suspect you do get an optical response from the cornea and lens (both of which are opaque to UV). It would probably save many headaches and eyestrain to use a set of UV protective glasses since the fluorescence you are looking for is outside the UV range and would be visible while using UV protection.

You could use a set of UV blocking sunglasses or purchase a set of UV protective glasses, which are clear.
Click to expand...
Ok thanks. Just wanted to be sure that this thing won't do any permanent damage to people's eyes. I have a pair of novalasers goggles block the uv light from this and they seem to eliminate the eye strain. Only problem is that they also block out all of the blue and green fluorescence effects.
 
Well then, I'll guess you'll just have to go out and build yourself a CO2 laser system then to justify the goggles, lol.
 
It depends on the wavelength really, if it is well below 400 nm i'd suggest using eye protection. On the long run, exposure to shorter UV light can cause very serious problems (such as cataract). This is a different mechanism that just sheer power which is normally associated with lasers - i guess you could compare it to sunburn.

On the positive side, most 'uv' leds are around 400 nm, perhaps down to 385 or so. At that wavelength the risks are rather limited, but if you go towards 350 nm be careful.
 
Some guy on dx says that the light from this is 395nm. I'm not sure how reliable some random guy on dx is and also it might vary from diode to diode. I'm also a bit annoyed because I was told that this can be used to detect pet urine and blood and this light seems to fail at detecting both of them.
 
It detects those things just fine if you use the chemicals that bind to the heme group in blood and specific proteins in urine. Forensic technicians don't spray luminol all over for nothing.
 
It should work fine for detecting urine, I rigged somthing like that up and i can see urine glow(works best on dry urine).
 
Yea , they're supposed to be 395nm, but all the POS cheapies are probably over 400nm....the violet you see is no bleed, it's the actual peak wavelength.Filtering that out will eliminate all fluorescence :( :P

My eyes tend to hurt from a blacklight tube too.Don't know about LEDs cause I only have a LED keychain that is not really powerful and I thought it was best not to shine it in my eyes for several minutes :D
 
ive never noticed anything with my Blacklight that i have, and ive spent 5-10 minutes looking right at it playing with paper and high lighters, or maybe they do and i dont noticew it cause they're already sore from lack of sleep :-/

but you should be ok anyway doubt it will cause any perminant damage
 
UV-Violet leds never go under 365nm. Research labs has made LEDs emmiting light in the 300nm region but lasted less than 10 seconds.
 
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