I think external modelling applications will always do a better job at lighting a scene than WED. For example WED shadows don't have realistic penumbrae.

Quote:

the greatest disadvantage would be that the shadows are only baked, move the chair in franks example and the scene will look odd. so this metod would only be good for an unchanging lighting situation in combination with immovable objects. rather limited, if you ask me.


The same goes for the upcoming static mesh support, exept that static meshes truely CAN'T be moved.

shader tutorial