Hi Sovereign, well as Woof said most people complained about the dark nights especially with the new LCD screens, also depends on the time of year & where you are (northern hemisphere), even on my standard CRT monitor at certain times of the year from 7.00pm to 6am the nights are almost black, but sometimes, (try navigation academy from dusk to dawn) the night are quite bright, I think it's fairly close to real as I & GWX could get.
If you want to change it though (90%of the effect) the files are the 3 ENV SkyColors_xxx.dat files, you could always replace these with SHIII stock, please note that Marhkimovs light night (the brightest there is) is embedded into the GWX files as standard!
Cheers.