Why should both behave the same on any parameter that would not matter at all? They are two independent designs, maybe driving the lamp the same way in their principle (a commutating polarity DC), but otherwise designed by different people, so ending using different circuits, with different behavior on aspects that do not matter at all, just because particular way became simpler for a given circuit.
If the frequency would be of any importance, you would see both behaving in a similar manner. Like they are very likelybehaving very similar way when speaking about arc current vs arc voltage dependencies and so on.
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