I've found the lower the value the better for reducing eyestrain. Slowly lowering it down in about 100K chunks it doesn't take long to get used to each step. I currently have mine at 4900/4200 (day/night).

Why so high at night? I do fine with candle setting at 1900K (though I turn my brightness up a notch from lowest).

The night value hasn't bothered me so I haven't given it much thought. I set it to that value when I first started using it as lower just looked weird at that time. I should probably try lower values at night and see if it effects my sleep.

My low setting makes me feel old. 3800 day / 2800 night. However, this is redshift (Linux), not sure it translates 1 to 1.

The new eyestrain preset is 5900K, so good call.

Where do I find that? I'm using the latest f.lux but I can't find all the new features...

Not sure if other platforms are different, but it's here at least on Windows:

https://i.imgur.com/7HWJvMb.png

Fascinating. On my Mac only have a few of those:

http://imgur.com/wycKzdS

Nice, just tried this. It reminds me of the "comfort view" tint on my phone that I forget is on over time.

Setting it to 5700-5800 seems to have made a noticeable a big difference to me, as I'm plugging into my monitor at home right away my screen had less of a bite.

Thanks for this! I just changed the setting and my eyes immediately felt less strained.

I just did this and I have to say I felt my eyes relax a little, and it looks the same. Thanks.