Featuring SCT Vermillion tinted lenses that are ideal for indoor applications such as inspection where contrast may be enhanced. UV or ultraviolet lamps are used in biological safety cabinets, light boxes, and cross linkers in many University laboratories and in some patient care rooms. UV radiation is that radiation just outside the visible range, or under 400 nanometers (nm). Germicidal lamps emit radiation almost exclusively in the far-UV range of 254 nm, and are commonly used in Laminar Air Flow hoods or biological safety cabinets and should be treated with extreme caution. Adapted from the California Campus Environmental Health & Safety Association Winter 1995 Newsletter What You Should Know About UV Light.
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Technical information on UV lamps, UV curing equipment, industrial safety products, testing instruments, ink and coating storage and handling materials, maintenance and printing supplies. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts.
Personal experience and extensive reading of the relevant literature after my wife burned her eyes with a UV germicidal lamp after following my instructions.
I believe that my advice as given is OK (read carefully please) BUT erring on the safe side is always wise. People exposed to bright high altitude sunlight for many hours risk being burned by the UV component of the sunlight.
In my workshop I have a ~= 20 Watt UV germicidal lamp - in the form of a "fluorescent tube" BUT with no phosphor so no fluorescence just hard short wavelength UV. Long long ago I used this lamp for bulk erasing windowed eproms (some of us are that old :-) ) and more recently it has been used for etch resist exposure or materials testing. I have used this light reasonably extensively over many years with no obvious harmful effects. A few years ago I set up some plastic samples under this lamp, placed a cover over the lamp and samples and left it running.
BUT given this result, an LED designed to operate at about 400 nM at about 60 mW input can be expected to output substantially more "somewhat blue" light than my sample and so would technically at least be of potential interest.
BUT the above example with short wavelength UV and the expert opinion re the lack of permanent effect at even high doses suggests that you are unlikely to have any problems if very basic and simple precautions are taken. Actual UV light does do damage to eyes and does still give off a very small bit of light that is visible. I'll be commenting in my answer, but, it is highly likely that this LED constitutes a Class 1 eye hazard, at least.
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Why do flight attendants say in safety instructions that you should put on your own mask before helping others?

Try searching with the Part Number (UPC Code) or Description from your light bulb, ballast or lighting product. This lightweight, handheld UV has 51 UltraViolet LED bulbs which allow you to cover a larger area. It’s made from impact-resistant polycarbonate and is coated to protect against harmful UV rays.
One of the problems in working with UV radiation is that the symptoms of overexposure are not immediately felt so that persons exposed do not realize the hazard until after the damage is done. Severe skin burns can happen in a very short time, especially under your chin (where most people forget to cover).
Please remember it takes 6-8 working days for you to receive your order after shipment, and ground shipping times are not guaranteed. A skier at say 6000 feet above sea level who skis all day on a bright day without using eye protection has a good chance of experiencing a degree of "snow blindness". As harmful effects are quite easy to acquire (see below) I assume that this means that taking quite basic precautions goes a long way towards reducing the hazard level. The professionals are without exception adamant that the retinal problem was unrelated to the UV.
She is certain that she followed my instructions correctly and there is every reason to think that she did. In the blue region the output was high enough to make them of potential regulatory interest. They do long term damage, I have an honest worry that you might be putting someone at risk with this advice.
I may be misinformed, which I always must accept, but our UV setup for etching was warned as very dangerous to eyes, although did not use UV LEDs. UV LEDs are thought to produce ultraviolet radiation that can be harmful to the skin, eyes, or other bodily organs. I have a WHITE LED rated at 3V, 50 mA that was formally tested by Nichia for me and which actually warrants attention in the blue to near UV region - despite being THE most efficient WHITE light producer for sale on earth in its class. I'd expect that prescription corrective glasses are generally much higher quality, including better UV protection. Sturdy nylon spectacle frames feature adjustable lens inclination and temple length to ensure a customized fit.
However, the UV light levels around some UV equipment greatly exceeds the levels found in nature. The danger to the eye is enhanced by the fact that light can enter from all angles around the eye and not only in the direction you are looking.
Full-face shields are really the only appropriate protection when working with UV light boxes for more than a few seconds.
For instance, I have a 405nm laser pointer, and I swear my eyes feel kind of buggy after playing with it for just a minute or two. They say macular degeneration of this sort happens with age and that the UV event was a fortunate means of showing them that this was happening. But, my wife wears glasses for close vision (or did before her eye sight was corrected as a result of the above processes). I'd guesstimate that you could stare at one of these all day long from 100mm and only get bored.

The truth is the radiation emitted is called "near UV," and it occurs below the threshold of harm posed by the true UV wavelength. Lens and temples are impact-resistant, 100% polycarbonate and vented side shields offer side protection from impact.
Most of these instruments are stationary, but there are a few hand held types that carry the same hazards as the stationary models. The lens can also be damaged, but since the cornea acts as a filter, the chances are reduced. The UV test results were relevant to what I was doing in China and I asked my wife to report on results to date. My reading showed that in the very very very large percentage of cases (probably 99.99%+) experience is as they report. I theorise that the very short wavelength UV was refracted substantially differently by the lenses and as she looked across and not at the light, the UV was bent into her eye.
These LEDs are near ultraviolet at 405nm, where the ultraviolet wavelength starts at 400nm - a tad shorter wavelength.
Nucleic acid (DNA or RNA) which has been stained with the chemical Ethidium Bromide, lights up when exposed to UV light. This should not lessen the concern over lens damage however, because cataracts are the direct result of lens damage.
Even people who are exposed so badly that they are literally "blinded" and lose the practical use of their eyes due to soreness and inflammation, will essentially always recover without any permanent effects.
I provided detailed & careful written instructions on how to uncover the lamp, how to inspect the samples, how to recover the lamp and, very importantly, how to avoid looking at the light in the process, complete with very clear instructions re the hazards. The routinely interested examiner suddenly leaped up and ran from the room to get a second opinion. UV exposure, even very severe and with short wavelength, does NOT lead to premanent damage or to retinal damage of any sort.
The type of LED you're using even at maximum voltage of 4.5 VDC at 30ma will have a power output around 135mW. My wife is a competent and careful science professional (in another field) so I anticipated no problems.
In one eye only she had partial retinal pulling causing a subsurface void near the optic nerve.which would have lead to retinal tearing and separation if left unrepaired. However, it was also apparent that in extremely extreme cases (eg welding without a mask long term) then retinal damage almost certainly can occur.
I've personally experienced minor "snow blindness" on a few past occasions either while skiing or in other higher altitude situations. The long-term risk for large cumulative exposure includes premature aging of the skin and even skin cancer. I'm also aware that if lensing did cause the arc-eye effect (see below) then the focusing MAY have resulted in a focused retinal spot - but the experts all say NO.

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