[accidentallfact]

Even the premise of the idea is wrong, as evenings are either blue from the blue sky, or white from the clouds. It takes exceptional circumstances to have a reddish evening, and even then it's just around the sunset.

I guess that it may help people with undercorrected myopia due to the chromatic aberration, but, I don't know.

[gurkenkram]

It is indeed about the sunset and especially the last phases of it. It's also why red light is recommended for night feeding when breastfeeding.

Works for me, both reducing the blue light and worked for my baby, too, using only deep orange and red light of a cheap LED color change lamp. Apparently works for many, since red nursing lights are suddenly sold everywhere.

[Symmetry]

The sunset and also fires. Humans have been making fires for a million years and in addition to allowing us to evolve much smaller guts they've also had time exert pressure on our behavior.

[philwelch]

I thought red light was recommended for nighttime because it doesn’t interfere with natural night vision.

[bawolff]

When the sun goes down the amount of blue light goes down. Are you disputing that? Respectfully this feels like a crazy claim.

[DoctorOetker]

Well technically during the twilight right after the sun has disappeared below the horizon, or just before the sun appears from under the horizon (when there is no direct line of sight to the sun), the sky is strictly blue-er: the reason the sun and the neighboring angles in the sky appears "yellow/orange" is because green and especially red scattered less through the atmosphere, while a good portion of blue light scatters much more easily on our atmosphere, allowing non-line-of-sight blue illumination on land where the sun has not yet risen or where the sun has already set.

All of humanity has been a witness to these observations and yet we blindly assume blue light filters must have such and such an effect.

But even if it did: suppose a modern concrete-cave-dweller has an out of phase shifted day/night pattern with respect to solar rhythm, having blue light as the last form of light actually seems more natural!

[bawolff]

Regardless, the intensity of blue (for that matter, all) light is going to be much lower after the sun sets.

[DoctorOetker]

but that kind of intensity doesn't really permit useful interaction with a screen

[accidentallfact]

The amount of red light goes down, (and you can use a camera with white set to sunlight to check how much blue it gets on a clear day, it isn't an illusion at all) so if anything, we should be using red light filters, not blue.