This weapons power takes a billion joules, and is also nuclear powered.
However, since the A.S.A. didn't have full knowledge of Black Lightning's powers, it doesn't match the strength and type of lightning/electricity of Black Lightning himself. This weapons effects are more so akin to a burn, a high voltage flash versus actually producing lightning or electricity, as proven by the fact that it didn't leave a tree pattern on Evelyn Stillwater-Ferguson, otherwise known as lichtenberg scarring which is a fractal pattern that occurs when electricity passes through an insulating material.
However most detectives and scientists wouldn't be able to distinguish the differences unless they have a general knowledge of meta-humans, specifically Black Lightning himself.