The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
"The cone photoreceptor inputs to the circadian circuity respond to short wavelength blue light, but they also respond strongly to long wavelength oranges and yellows and contrasting light – the colors at sunrise & sunset."
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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these cells have these two cone photo pigments and they say how much blue light is there how much red light is there or orange light and the subtraction between those two triggers the signal for them to fire this signal off to the circadian clock of the brain
the optimal stimulus is that low solar angle sunlight in the morning especially and in the evening because those cones and in particular the the short wavelength responsive cones the BL AK blue light and the longer wavelength the Reds the orange they converge in terms of driving the activation of those cells those melanopsin cells and they activate those cells robustly early in the day meaning when you see contrast between blue and orange or blue and red which is istic of low solar angle sunlight you are driving those the activation of those intrinsically photosensitive gangling cells the most