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Originally Posted by j.p.s
It was honest confusion, and color can be confusing.
Besides, there is overlap in cones response to light of various colors. But it turns out that red and green have a lot of overlap, not green and blue.
Anyway, I just did a search on green light interfering with sleep, and it turns out that green light was the control for the original Harvard study. So, even if green light interferes with sleep, it is much less than blue light.
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This depends heavily on the exact green spectrum your LED technology uses. The developer of f.lux, who's spent years studying the impact of light on sleep, discusses that here:
https://justgetflux.com/news/2018/02/16/OLED.html
Re: the iPhone X, for instance (compared to the iPhone 6):
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The new OLED screen has a high-powered green color, and both blue and green move into the “melanopic” region of the spectrum that tells your body it’s daytime...OLED screens make more saturated greens by moving the green primary from 540nm over to about 524nm, which may sound like a small change, but the shape of that green also gets narrower, and so a lot more of it winds up in the range that affects melanopsin, more of it than did before.
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(“melanopsin” is basically the tendency of light to impact sleep)
Combined with the brighter/larger screen, the net effect is that the modern iPhone emits more sleep-impacting light than older i
Pads did. But there are tools to mitigate that (brightness and warmth controls) if you use them.