I also started using redshift (linux equiv to flux) several years ago and gradually used it more, even during the day, as I also found it seemed to help mitigate migraines at least to some extent and it just generally reduced my eye fatigue.

I have a shortcut on my KDE desktop that runs this command:

    /usr/bin/redshift -O 3500 -b 0.7

It instantly makes the screen easier to look at, no matter the lighting conditions. I also have a command to revert to normal color:

    /usr/bin/redshift -O 6500 -b 1.0

Curiously, "redshift -O 2700 -b 0.7" is less comfortable than 3500K because it's too yellow. I think what bothers me about screens is heavy saturation in any color.

You can also use `redshift -x` to reset to the default.

This is most definitely not placebo.

Blue light is known to cause migraines even in the blind that even lack cones/rods: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4939697/

Have migraines. Can verify.

huh... that's fascinating. Thank you for the link! Reading through it now.

this was also my experience, so we can now consider it anecdata ;)