If you suspect the mag12, have you tried turning the pump off for a while and see if you notice a difference with the lights?
I don't know how to diagnose a faulty capacitor. If it was the capacitor, I would have guessed you'd be having problems starting, not overall intensity. But that's just a completely uneducated guess on my part.
Can you try a new bulb? I mean, like a completely new bulb. I guess that's not ideal since if that's not it and you have to buy a bulb just to try then you're out the $$$ and not really any further ahead. I guess about the only other thing to try is see if someone can lend you another ballast for an afternoon, play around with that and see if there's any difference.
Good luck, let us know if you find anything out.
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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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