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A comment on Chemists discover how blue light speeds blindness. Parent comment

Re:Chemists discover how blue light speeds blindness by mafuyu on Thursday August 09, 2018 @02:09PM (#17726791)
Yeah, especially with these cheapo Chinese LEDs. I looked into spectrometers, but they seem pretty pricey. Maybe some sort of plastic filter that blocks the shorter wavelengths?
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Re:Chemists discover how blue light speeds blindness by bb88 on Thursday August 09, 2018 @05:42PM (#17728781)
How about a simple prism? That would tell you instantly if there's any blue light in the stream.

Edit: You might need a mask to create a slit of light so you can see the spectrum clearly.

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Re:Chemists discover how blue light speeds blindness by mafuyu on Thursday August 09, 2018 @07:36PM (#17729494)
Oh, yeah! Totally forgot about those from high school chemistry class. :)

I'm sure there'll be _some_ blue light. I don't know if a prism would be high resolution enough to tell if it's a dangerous level.

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Re:Chemists discover how blue light speeds blindness by bb88 on Friday August 10, 2018 @11:11AM (#17733978)
Yeah, you won't be able to see the intensity, but you will be able to see what components of the spectrum are there. It's also and easy way to test filters.
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