250w in a 175w

unless the socket says you can run it on both, i would not do it. Asking for trouble imo, specially w/those powerful halides.
 
The socket might be compatible. I think they are the same size, but the ballast won't be, and the rest of the fixture might be a problem, too.
 
The operating voltage of MH bulbs varies with their wattage, also magnetic ballasts use a current limiting capacitor to avoid bulb burnout. So even if the light bulb socket fits the bulb you can't power a 175w with a 250w ballast. Be careful with these bulbs if they get too hot the outer shield will break and can start a fire or emit high levels of radion to your tank.
 
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