The 500W halogen fixtures are probably OK for the 150W sizes but if you read those threads -- I think you'll find that they're not really suitable for the 250W lamps because there's simply too much heat. Lamp size may also be an issue, the halogens are roughly the same dimensions as the 150W but the 250W's are larger. BTW you're not supposed to cool those bulbs, so you need to have a proper heat sink. (There should be several threads actually ... not just one ... that's why I said to do a search on RC ... you'll find LOTS of info there, all you need to know.. including discussions about what glass to use.)
Good luck.
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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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