How to make good "Billboards with windows and particles" ?

[Doctorcheese]

Thanks guys, i check that guide but i have one question to ask too.

How to make good "Pointlight places" and good lighting some rooms?

Well getting the right color can be hard with pointlights, but just experiment and you'll get it sooner or later. For the lighting, make sure you have a boxlight covering the whole level and make it:
0.15
0.15
0.168

That's how I make my boxlights if I want dark, but not too dark areas.

Now for lighting more with point lights, give them more radius and it should be all right.