It depends on the ballasts that the fixtures use, but remember that some ballasts can run both halide bulbs and mercury vapour. If the ballast says M57/H35 then it runs 175W bulbs of both types, M58/H36 then 250W, etc. etc.
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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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