xrandr brightness and gamma values seem to be false

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I am trying to emulate night mode on my external monitor because when I change the brightness with xrandr night mode gets disabled.

My idea was to make xrandr output the current values (when in night mode) of the monitor with xrandr --verbose | grep 'Brightness\|Gamma' , which did output the values, but after setting those I get a different blueish background color than the warmer one I expect.

Does anybody know what is going on there and how to fix it?

Thanks in advance!

-OS: Ubuntu 20.04

-xrander v.1.5

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