I am going to have to disagree with the too much lighting...And 5 watts per gallon IMO
is not enough for corals. I have 384 watts over my 55 and I am thinking of adding 2 175 mh
to the mix of 4 96 watt PC
The real question is what are you going to keep that is going to demand the strong lighting?
If you are thinking of SPS
and Clams, I am with Kevin, it is going to be just right.
The 4 VHO
's though, will not fit in the Wal Mart hood. It is also made of regular plastic, and I am afriad it will melt under the heat conditions. It is made to just hide the light fixtures that come with their kit...
A wooden canopy will cost you roughly the same amount, and look much better...