gavin77 said:
Well I don't know if this is the reason, but in Star Wars The Clone Wars, which is completely Lucas' vision and direction, where the Ion Cannon is first introduced as a seperatist weapon, it is blue, with the energy/lightning thing going on.

Yes, but the Clone Wars is EU territory just like the previous series. Both are done with Lucas' vision and direction and are do exactly the same thing. And if I may say add, the spinning star field is also a part of Lucas' vision and direction as well.

- Jeyl