what about a sprite 'star' with 3 copies of the sprite parented to the same pivot each rotated to its own axis the edges would be hardly noticable if done correctly. even better, set order to -1 & use pickmode to fade them when not visable to camera or yaw angle is out of line.
alternitavely sprites if used in free mode can be aligned to the light object as close as possible
alternitavely sprites if used in free mode can be aligned to the light object as close as possible