Ok I see what you mean. Unfortunately I don't know if that will work or not. It might, for all I know. But I'm no electrician, so for all I know there's an equal likelihood you'll explode your bulbs. I have no idea.
If you trust whoever wired it up like that, then go for it. But if it were me, then I would switch that around. Basically make both ballasts the same (and match the diagram on the ballast schematics). There's no reason you can't tie both 120V wires to that switch, so you can still have the lights turn off and on at the same times, which is what I presume what you're after here.
At the very least, it seems to me as if running the ballasts in a sort-of series like this makes them dependent on each other. I.e., if one lamp doesn't fire then neither will the other. To me, that's a disadvantage: I'd rather be able to fire one lamp if I needed to, while I went about replacing the other lamp in the event something happened to the one of them, and so on. But that's just me...
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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