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ioman
on Feb 1, 2023
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Morning exposure to deep red light improves declin...
You can find devices like this online by googling "670 nm led"
notacoward
on Feb 1, 2023
[–]
670nm is indeed not hard to find, but also it looks like 660nm is even more common.
Plenty
of products from flashlights to bulbs to full fixtures.
Consider applying for YC's Summer 2026 batch! Applications are open till May 4
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