Forum:KB:Is there a Light Sith?

After reading a few Star Wars Books that include a Dark Jedi. I've wondered about a Light Sith - A Person who turns their back on the Sith and follows the light side and serves only them-self (The opposite of a Dark Jedi besides the self-serving part). Some might say that a Sith would just turn into a Dark Jedi but the person wouldn't be a Dark Jedi since they weren't a Jedi. They also wouldn't be Dark since they are following the light side. Thank You =P.