I highly recommend using f.lux to adapt screen colors at night. It makes reading some pages harder once it goes into full candle-light mode, but I take that as a signal that I need to start getting ready for bed!
Redshift is one of the first things I install on Linux, and I set it pretty orange in the daytime too. It works on X and Sway; I'm not switching to Wayland until I can use it. (GNOME also has a built-in blue light filter with a manual time option [thanks to comment below]. I know KDE is working on a similar feature for Wayland but I don't know how it works.)
Redshift runs very well atop my KDE and my sleep would surely suffer without it.
Be sure to fiddle with the config [0] to customize the color temperature of the application even further to your liking -- the default settings can sometimes mess with your display's viewing angels.
Gnome built-in blue light filter has two modes : "Sunset to Sunrise" or Manual where you define your own schedule. Should work on Wayland too but I did not test it as I stay on X for now.
I've been using it for a long time but I have a question.
Sometime ago somebody on reddit or here on HN claimed in a comment that f.lux does not actually reduce the amount of blue light if you measure it. Unfortunately I never saw any replies or sources, and looking for discussions about that subject were unsuccessful.
Does anybody have any actual knowledge that could support or refute that claim?
PS: I hate it when people make claims like that and don't even attempt to support it. Now I'm still looking for an answer months later.
I find it hard to imagine how the screen could look yellowish while still outputting a lot of blue, but you can actually check it - look at the blue sub-pixels with a magnifying glass or your phone camera and see if they actually dim.
Could it be that on lcd screens you can't eliminate blue light fully? Tested this with comour filters on iphone 8. Fully red, still emits blue at angles when held to a wall. Apple watch with red flashlight on doesn't do this. (It's oled)
I think it was in f.lux's blog that while f.lux does reduce amount of blue light, apple's built-in night mode (the one on your iphone for example) didn't.
Contains a link where a graph (which I don't understand) is almost identical with and without sleep shield.
lorna F.LUX TEAM Aug 17, 2017, 5:48 AM
And here is the same iPad with one of the many filters that claim to help sleep (unless they are a deep orange, most of them do absolutely nothing): https://fluxometer.com/rainbow/#!id=iPad%20Pro/6500K-iPad%20Pro&filter=filter/SleepShield
But that SleepShiled looks like is a physical device actually.
I prefer it since you can control it better. It can also remove more of the blue light. I actually have it remove a little bit of blue light all day long and then really remove a ton of it at night.
