User blog comment:Mr. Bambu/D&D Calc Compilation: New Ones/@comment-31165326-20181203194423

Not all Lightning Bolts are 5 Gigajoules, they can vary in potency, though, I guess wiki treatments are wiki treatments.

Though if you really felt like it, you could try to see the potency of a bolt via the Mikasa method

(Though, you'd have to be able to read the only language that Narutoforums calcs are done in, math)