Thanks! Here are my responses - sorry for the delay.

Dimming definitely helps in my experience. I only relatively recently started using f.lux so I don't know I've 100% optimized it, but I keep it at almost sunset level the whole day and it seems to help. Not sure - I use a Macbook Pro if that helps. Maybe other people can speak to their experiences (I bet you could find some on the Reddit forum if not here) but morning vs. night isn't really the main difference. The big thing is just: have I overdone it earlier in the day (or even the day before)? Earlier on, when things were worse, my day could be shot after a few hours, so that would make it seem like evenings are worse but they'd only be worse because of the opportunity to screw things up in the morning. Overnight, I partially "reset", but not completely. So anytime after the first few hours of the day is on average worse, but mornings are probably more important all else equal.

An analogy that might help (though it's not exact) is having a headache. You don't want bright lights when you have a headache. Also, at least during the first few days you have problems with filtering light out - everything has glare. I first realized I had a problem when I looked at my e-mail in the morning, sitting at the same distance from my computer as usual, and couldn't read it (due to glare). (Similarly, years ago I had Lasik -- initially I had some small amount of halos/starbursts around streetlights at night, but that went away in a few days as my brain learned to tune it out. After my concussion, I got those halos/starbursts back with a vengeance, as if my brain forgot how to process that. I suspect people also have adapted to using computers over time -- if you went from 0 computer usage ever to 10 hours a day, you might also have a problem until adjusting.)

Thanks again for your good work, and for the questions!

I am hearing this is fixed in Mojave beta 5, but there is a post here that can help if you are on an older version:

https://forum.justgetflux.com/topic/6514/true-tone-mac-introduces-artefacts-when-flux-enabled-fixed-in-beta-5/10

The time of sunset is defined in astronomy as the moment when the upper limb of the Sun disappears below the horizon. Near the horizon, atmospheric refraction causes sunlight rays to be distorted to such an extent that geometrically the solar disk is already about one diameter below the horizon when a sunset is observed.

tried uninstalling manually and it still behaves in this way. any advice or things to try would be appreciated.

I also had flux disabled for fullscreen apps. It's ok now though.

For everyone reading, the profile is a 10-bit calibration table from a Datacolor Spyder.

We are going to add support to our reader for this, but f.lux is ignoring it in the current build.

I usually refresh the wallpaper here.

Just making sure you know about the recall on these models?
https://www.apple.com/support/macbookpro-videoissues/

f.lux has three times of day, and you can adjust the setting for each one separately.

Click each tab one at a time and it the way you like, or start with a preset (from the pulldown menu).

During the day, in between sunrise and sunset, change the color temperature to something that feels good. I expect you to prefer color temperatures that are no higher than maybe 3000 to 3500K. The lower the number, the less blue light there is.

Do the same during the night.

OK I figured it out. The icon for f.lux is tiny and I couldn't figure out what you meant by "to the left of your system clock" but I eventually found it and adjusted the color.

Whew!