I'm pure Dark and was thinking about switching to Light just for the saber color. The only option seems to be running flash points and Black Talon is probably the fastest option. I'm personally not going to do it, not worth the grind. If I was you, I'd make a decision and grind out to either side and leave it at that. If you aren't finished leveling to 50, I'd just continue your journey and stick with the same choice moving forward.