Doug, just keep an eye on your levels. That was kind of a big transition for the 10 to the 46. Are you running the same light?
If you're in the market, Three Guys took in a 36" halide / PC combo light about a month ago. I'm not sure what he wants for it, but he'd probably wheel and deal... The Halide is a 250w (I think) and it has 150-175 or so watts of PC, oh and 3 moon lights.