MatthiasKNU wrote on Jan 3^rd, 2018 at 12:10pm:

Then I have to see if I can adjust the colors in P3D a little bit...

We don't think that's a good idea because HDR is a dynamic feature with hundreds (thousands?) gradations. You'll never match all of them anyways.
Moreover, if you darken the tone to adjust the daylight exposure you'll get underexposed dusk/down/night cockpit.