You need to look for a file in the same skin folder as your skin. The file name is material.txt
edit it.
it has 4 main lines. This is what I BELEIVE they mean
Ambient - Overall aircraft lighting
Diffuse - The transition lighting between the Ambient and Specular.
Emissive - This is the light the plane gives off?
Specular - The "shinyness" of the aircraft.
Now, you'll notice there's 3 sets of numbers for each one....
0.xxx
These numbers go from 0.000 to 0.999
(I think)
The lower the number, the less light. The 3 sets stand for the Red, Green, and Blue color spectrums, for example
This
0.900, 0.000, 0.000, specular
would mean the plane would have a bright red shine
Here's what I use for my B24s
0.375,0.375,0.375,Ambient
0.500,0.500,0.500,Diffuse
0.000,0.000,0.000,Emissive
0.220,0.220,0.220,Specular
8.200,Power
Hope that helps