spaulr,
This modded hood gives me ~7 watts per gallon on my 50 gallon AGA which should be plenty to support the SPS coral family and is plenty bright enough to support most LPS and other corals with only the PCs on. I have no regrets buying this hood, it is HIGH QUALITY and well thought out. If I ever do get another aquarium, I would most likely purchase this hood again.
If you are planning on going over 10w per gallon, you may need to think about your poor electrical bill and you may have problems with some of the lower light corals like mushrooms and the like. I think that 6-8w per gallon is enough light for 90% of the corals in the aquarium trade and may be good enough for anemones as well.
JohnHenry,
It was quite an easy mod. I just opened the end up where the PC ballast resides, yanked it, and put a 2x96 ballast in there. If you need more help, please PM me and I will tell you exactly how to do it.