I currently have mine set to 3.0 from the original 2.5, with everything else at default settings at midnight I can get a fully surfaced Sargo running at 15 knots within 500-1500 yards of a warship.
For the actual graphics, a good place to start is in the menu folder menu_1024_768.ini;
[G31 I54]
Name=Night filter
Type=1030;Static bmp
ItemID=0x31000005
ParentID=0x31000000
Pos=0,0,1024,768
Zone= 0 768 1024 768 2 1 0x31000000 0.5 -0.5 0x31000005 -0.5 0.5 0 0
Color=0xFFFFFFFF
Materials=1
Display=2;Linear
Mat 0=data/menu/gui/night_filter.tga
MatFlags=0x9
TexFmt=0x0
Where it says ".tga" it often actually means .dds, so I would try two things;
1. Change that Color=0xFFFFFFFF to something lower like BB (FF is hex 255, red green blue all set to 255 is white, all three set to 00 is black - the fourth number is probably gamma or brightness)
2. Try opening the Night_filter.dds file in an image editor and lowering the gamma, see what that does.
Don't forget to back up the files before hacking.
Biggest problem I see is not being able to see, I've run across nights in the stock game (particularly when it's raining at night) where I had something on radar and couldn't see it until I rammed it. Are we working on the dark or working in the dark?
