a dark Jedi

This crossed my mind a few days ago and i wanted some opinions from the experts,
now i know that the darkside consumes who ever uses it, and that once you start down it you cant go back, but was thinking dispite the sith being selfish, would it be possible for a someone to actually use the darkside to do good, now i am talking about using 100% darkside force lightning and all, not just tapping into the darkside (wich was discussed in a previous thread), point is when you think about anikin beats dooku when he uses the darkside, and luke only beats vader when he taps into the darkside. So my argument is this, could ajedi use the darkside of the force to beat sith if that jedi knew he was doing good... or would this just lead him to becoming a full fledged sith and not helping anyone but hinself

 

You can come back from the dark side. Vader did, otherwise he would not have been able to show as an apparition in ROTJ.

The novelizations also state that Mace Windu's fighting style is a balance between dark and light. Mace is just trained enough that he can keep the dark traits in check and not allow them to consume him.

 

you should really ask dark_jedi32. He knows all about that.