10.05.2014
ReviewsThere are no reviews yet, would you like to submit yours?Disclaimer: These are user reviews. Simple installation and maintenance1 Install purifier as close as possible to the location in which it is to be used.2 Connect inlet and outlet to water supply. 3 Plug into grounded electrical outlet.4 Maintain by cleaning quartz sleeve with manual wiper once every month - more frequently where indicated by application conditions. 5 Recommended lamp replacement: Once every 10,000 hours of operation (approximately 14 months of continuous operation).
Lethal exposure times1 The dosage necessary to inactivate a microorganism is a product of time and intensity.
2 When used as directed, STERITRON purifiers will provide a dosage in excess of 30,000 microwatt seconds per square centimeter (V,Wsec%m2).
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. Not the answer you're looking for?Browse other questions tagged safety or ask your own question. How many coconut trees would be necessary to support a single, middle-aged human on a deserted island? Prolonged, direct exposure to UVC light can cause temporary skin redness and eye irritation, but does not cause skin cancer or cataracts.
Halogen lamps provide feel-good light that has a similar effect to natural light and they perform a wide range of functions. Compact fluorescent lamps are the bright and economical alternatives to ordinary light bulbs. Fluorescent lamps produce 70% of artificial light throughout the world.Their excellent economy and eco-friendly characteristics make them the first choice for many applications. The advantages of modern high-pressure discharge  lamps include low thermal output, excellent color rendering and long life.Consequently,they are the light sources of choice-wherever products and objects need to be presented in brilliant light and true colors,such as in shop windows and retail outlets-wherever energy efficiency and long life are important, for example in factories, sports stadiums, street lighting and horticultural lighting.


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These lamps eliminate the possibility of overheating and the need for special equipment to deal with overheating.
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.
Lamps and ballasts can be placed inside AHU's housing, thus eliminating the need for a power enclosure. American Ultraviolet systems are designed with safety in mind and, when properly installed by a professional contractor, do not allow exposure to UV irradiation and allow for safe operation and maintenance. For applications in which shape and appearance play a major role even when the lamp is not switched on (decorative range, colored lamps) or for those in which the lamps have specific uses, such as shockproof lamps, infrared lamps, TV lamps, special lamps for refrigerators, ovens, sewing machines and so on. They provide light in furniture, display cabinets and small luminaires, and can transform entire rooms. They reduce electricity costs by as much as 80% compared with light bulbs of the same brightness, and last up to 15  times longer. You can choose your preferred shipping method on the Order Information page during the checkout process. 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.
Do not stare into the UV flashlight for prolonged time as it can damage your eyesight with direct exposure. Thanks to their internationally standardized bases, halogen lamps can now be used in almost any luminaire. Their low power consumption and long life make them particularly economical.They are suitable for general lighting, architectural lighting, illuminated advertising, corporate lighting and orientation lighting inside and outside buildings. 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. They can be used in designer luminaires, recessed lights, information signs and traffic signals. 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. 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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Comments Germicidal lamp exposure time formula

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