6500K is no reduction. 1900K is the maximum reduction using the default settings. You can go as warm as 1200K with the slider if you enable the setting to enable the wider slider ranges, and you can go as warm as 800K if you use the keyboard shortcut Shift+Alt+Page Down. The lower the Kelvin value (K), the less blue light there is. 800K is pretty much just red.

However, due to varying differences between the color accuracy of monitors, no two can be identical. So, 1900K on your monitor likely has a different appearance than it does on mine or anyone's monitor.

Just use a setting that enables you to relax and feel comfortable and sleepy at night during the last hour or two or three before bed at the end of your day. Combine a warm color temperature setting with a lower monitor brightness (you'll have to do it separately using the buttons on your monitor or laptop keyboard).

@FFThrowAway said in F.lux and Firefox/Chrome lag issue:

ne else had this problem? If it is not just my computer, I suspect a lot of people have had the same problem and don't realize it could be due to f.lux. Strangely enough it took me this long to notice.

i have the same issue. Uninstalled flux and now its ok :(
now using night lamp feature in Windows 10 but its less good. Hope it will be solved soon.

Hmm, well the first thing is, you need to install a "real" video driver - the Microsoft Basic Adapter is not so good.

But I don't think it should be doing that even so.

Update:
It seems that it takes data from ambient light sensor. Is there possibility to disable this?

If you have f.lux set to disable when running a full-screen program, then it should. Otherwise, it won't by default, no.

Oh and to answer your other question, this happens as soon as the program is launched. I don't have to click anything inside the program, it just starts going from normal mouse icon to "working in background" mouse icon.

Again, I am unsure what causes this but it seems to be an issue with the program crashing and restarting but I am unsure if it is the entire program or not because the screen stays with the Flux settings still being used.

@Qub1995 Wow, thanks for this! I had stopped using Flux because of this, but I'm back on the boat now thanks to this tip. Cheers!

And today the problem came back. I don't know what happens.

Thanks for that. I have made the change and will see if it works.

Chris C