Hi
For 2d add somthing like the following to the bottom of the panrel.cfg
[Color]
Day=255,255,255
Night=4,4,4
Luminous=128,0,0
the numbers are RGB colors

VC a bit harder and depends on how the nightlighting was done if it was done by emissive polys then not much you can do (you will mainly find this in FSDS models) if its been done by textures have a look in the aircraft texture folder for any _L textures (these are for lighting) you can edit these to change the color of the lighting if they are mapped to the VC panel.
Wozza