Difference between AC and DC HID Ballasts

AC is an alternating current (the amount of electrons) that flows in both directions and DC is direct current that flows in only one direction; the product that is flowing being electrons.
DC electrode wear is from one electrode due to one-way current flow whereas in AC, electrode wear is more even due to two-way flow.
There is no way to tell if a ballast is as AC or DC by looking at it without opening the case.

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