ChainsawAsh said:

Are you talking about adding ambient light to lightsabers in the movies?

Lightsabers definitely cast ambient light in Attack of the Clones and Revenge of the Sith, but they don't in any of the other movies.

I believe Adywan is adding some ambient light to the lightsaber duel at the end of Empire for ESB:R, but not in every shot, as it's quite difficult to do.

Yes, I was wondering about adding it into the movies since all of those changes made throughout the years, though I knew it´s not easy; however I think these guys in the video made quite good job with it.

http://www.youtube.com/watch?v=pfa-Pa5IQLg (definitely watch in HD!)