You can easily solo Black Talon/Essles at 50. Its the first instance in the game, designed for 2 level 10-15 players. You can run past virtually all the trash two shot the bosses and collect 200 light/dark side points per run. Whole thing takes about 10 minutes. I've groun from dark side 4 up to light side one just by doing black talon (got sick and tired of the red and yellow glosticks)