In that example, thomthom, there are definitely lights inside, right? What about giving them a color? Tungsten 100W have a color temperature around 3200K which is about RGB 255,241,224. Because of the reflection on the roof overhang, it looks to me like they are actually changing the color of the lights.
I'm all for some post-pro, but the more I can do in the rendering itself the better, IMO. That way I can reproduce the effect as I change the design.