The way it was explained to me, the ballast is like a sort of a brake. As the arc tube in the lamp heats up, it offers less and less resistance, so the ballast is used to govern the electricity flowing to the lamp. So lamps and ballasts need to be paired to one another..
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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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