I cannot remember how to do it but I know there is something in the fs9.cfg that edits the 'size' of the lights and intensity.
For some reason my lights (aircraft and ground) are very sharp and colored beautifully, but they are tiny.

Gringo6 wrote on Dec 17^th, 2012 at 6:11pm:

The thing is the size is really the only issue. I do not want to replace anything else. I remember having to edit something to tweak the size but I cannot find it again.