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November 16, 2009
about 5 years ago
In response to some of the comments:
Most regular safety glasses block UV. I use a pair I bought at home depot that are shaded for the brighter LED systems I work with.
Even the Nichia 365nM LED’s that I work with at times emit some visible light, their peak is at 365nM and the light emitted above 400nM is weak but visible. There may be some materials in the LED’s that absorb UV and re-emit visible as well.
I’ve been working with UV LED equipment for several years and have never gone home with a tan. I’m not exposing myself to it for hours at a time either. For times where I have to work with it for extended times I have welding gloves, sunblock, and a good pair of safety glasses.
The lights I work with emit up to 15W/cm2 at 390nM so I’m more likely to burn myself then get a tan. Still I try to limit exposure time. The LED’s listed here are very low power, but a long exposure time at low power can equal a short time at high power. Less time is best either way.
These LED’s are good to 20mA, I have tried to push the current higher with similar LED’s and they don’t last to long.
At 395-400nM security features will show up but they are more pronounced at shorter wavelengths. This is probably what is used for those little flashlights they use to check your drivers license, and money. Low power and long wavelength for safety.
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