If you're thinking of upgrading already, you probably should! Better to setup the system you really want the first time, and save some $$$.
I dont mean a 250w SE bulb in a DE socket (because this is not possible). I mean a 250w SE bulb in a mogul socket being overdriven by a HQI ballast. Just an option, my preference is actually the good old heavy, magnetic pulse start ballasts.
Heat issues can be dealt with, a 250w over a 33g tank is definately possible. It depends on if you hang the fixture, or enclose it over the tank, and fans can be used to help as well.
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