A Jedi sufficiently strong in the Force can be trained to produce a facsimile, but not true Sith lightning, which, unabated, has the power not only to incapacitate or kill, but to physically transform the victim. Force lightning requires strength of a sort only a Sith can command because we accept consequence and reject compassion. To do so requires a thirst for power that is not easily satisfied. The Force tries to resist the callings of ravenous spirits; therefore it must be broken and made a beast of burden. It must be made to answer to one's will.
( James Luceno )
[ Star Wars: Darth Plagueis ]
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