This is caused by Microsoft Night Light (it's not a problem with f.lux). Disable Night Light.

It is linked with a Mini DisplayPort (Thunderbolt) to HDMI Adapter on a Surface Pro (2017) if that helps at all.

Any visit to our site in your browser will set that cookie - removing it once doesn't block it forever.

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@heniek_htw said in 900k:

@twocables said in 900k:

keyboard shortcuts

keyboard shortcuts works grate ! thx.

If I go 800-900k and test:

I removed the images to reduce the need to scroll. -TwoCables

I do not see green.

green wavelength exposure (not only blue) suppresses melatonin.

Oh, you wanted to block green. I see now. I'm very happy to help!

Nevertheless, even 1900K can be 100% "safe" and 100% non-alerting if you are using a very low display brightness. That's why it's the lowest color temperature by default.

Yes it conflicts with that - you can also download 4.78 and it will usually help you turn it off.

Never mind.. found the reason: Windows Night Light turning on at the same time

I agree, @ Flux team, please have this feature available on upcoming versions, i always have to click this mode manually on windows startup which is annoying everyday.

Generally we advise updating drivers to something more current.

I only created this account here to say Thank You!!! Every evening at 21:00 this screen flashing was killing my eyes.

@fluxteam please add a warning to people to disable Night Light in Windows. You have no idea since how long this was making me hate Flux just to find out it's a simple incompatibility between two software, not a bug in this one. A message to the user would fix it for everybody.

You should go to  System Preferences — Screen, and turn off all Night Shift options.

After that, make sure you download the latest version of f.lux.

Here's the latest article from Apple on this in-built feature:
https://support.apple.com/en-gb/HT207513

Hope this helps!