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A comment on Morning exposure to deep red light improves declining eyesight. Parent comment

Re:Morning exposure to deep red light improves declining eye... by ioman on Wednesday February 01, 2023 @08:57AM (#34610442)
You can find devices like this online by googling "670 nm led"
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Re:Morning exposure to deep red light improves declining eye... by notacoward on Wednesday February 01, 2023 @09:24AM (#34610831)
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.
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