Even if it is a 150 watt hps you will produce alot more bud than you will with cfl's.
The danger of saying things like a 150-watt HID light would be preferable to CFLs is that most people new to HID lighting expect too much from it, unless it is higher wattage. I dislike CFLs, and yes I have tried them so I could compare and not just be talking from what I thought I would think/like, but someone with enough CFLs and who positions them well can pretty much match anything someone with a lower wattage HID light will do until they learn its limitations and learn how to maximize its use.
The limitations of light penetration of lower wattage HID lighting is more than most people who never used them realize. I did not read this thread from the beginning so I do not know if there were heat issues that would keep someone from using a higher wattage HID light I would say go with a 400-watt HID light with a switchable ballast.
Unless there is some problem that cannot be overcome that would keep someone from using HID lighting that is higher wattage than 250-watts, go with as much more as you can without causing a problem that you cannot overcome or afford to overcome, which I guess would be the same thing now that I think about it.
As long as it does not create a problem more is always preferable to less when it comes to light and that of course also applies to HID lighting.
HID lighting alone is not magic. A lot of HID lighting is magic.