Two options:
If you're using Win 7 (or belove), Beemer's lighting addon is your asnwer: [
www.mediafire.com]
Is based on a custum ENB Series and works great.
If you're using Win 8 (or 8.1), Beemer's lighting addon will not work. In this case, i suggest to use SweetFx or ReShade (+ SweetFx) and use those values [
www.nogripracing.com] made for GTR2. Since both games uses the same engine, should work well.
It's better copying the SweetFX_settings.txt values, since the new structure of SweetFx (or ReShade) or will not work.
My workthread with all RELEASED and WIP stuff