The Jedi don't do it because it's against their mandate, it's to aggressive.
Sith Lightning, or Force Lightning, it doesn't matter, is pure energy channeled through the person by using the Force. How powerful the lightning is depends on how powerful and how much energy the person is and has. Since a Lightsbaer is also pure energy, it can deflect the Lightning, which is hurtling at a good speed, by using it's motion against it.
Quite simple physics really.
Originally posted by Atlantis001Yeah we figured that one out, but why is it all attracted to the lightsaber.
Force lightning would be the use of the force to channel its energy in the form of eletricity, so every property of force lightining is that of the eletricity. Eletricity have that form of vaiours chains of lightning for a reason, so that power has to be eletricity.