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by CurlyRed on Sun Sep 29, 2019 8:23 pm

I was curious about the uv leds. How safe are they? I did not see any information on the power emitted by them, or exposure time limits for skin or eyes. Would that information be available (for example on the 400 nm led)?
Thank you.

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by millercommamatt on Sun Sep 29, 2019 9:43 pm

Are you talking about these:

If so, here's the datasheet: ... asheet.pdf

Luminous intensity is around 350 mcd.

No idea about safety.

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by cstanke on Sat Nov 02, 2019 5:51 pm

I didn't see any safety advisories on the Adafruit site for the UV LEDs, but I've been working with one of them for an installation I'm doing. If I look toward it too long (multiple times for more than a few seconds) my eyes start to hurt like I've been out in the sun for a day without sunglasses (maybe mild UV conjunctivitis, I guess). I'm not staring directly into the lens, mind you. I sanded it down with 400 grit sandpaper to try to diffuse it a bit but that didn't seem to help (nor diffuse it like I wanted). I started wearing UV blocking (yellow) safety glasses when working with the LED because it quickly becomes uncomfortable and the discomfort lasts for a few hours.

It begs the question though if it's OK to use for my installation. It's charging up some fluorescent paint for a few minutes (<5) at a time. There are chances people will look at.

I found some info from UC Irvine that talks about UV-A (400nm) radiation and mentions possible issues that could arise. It's not as bad as UV-B or UV-C (100nm to 318nm) but also not particularly good for you either.

I might be more photosensitive than others but, I say exercise caution and use some glasses!

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Please be positive and constructive with your questions and comments.