I don't like the fact that the effects are blue while the lightsaber is red. These 2 colors aren't really going together here imo. Maybe you should also create some red effects ;) There's also lightning comming from the effects but I can't see the lightning on the bottom of the render. So I guess I would lesser the lightning at the effects. Uhm....the c4d's are looking pretty cool. Lightningsource is okay, you have a decent depht. I would add some more gradients to get some better colors tho. Other then that....cool sig! KIU :D