i suggest otherwise...his tank is 4ft long..it is probable that he will position the MH one on each side (left and right) this way, it will look blue on one side and white on the other...
i second to ryz...save on electrical bills and t5...
if u are thinkin of getting 10kk bulbs (which are cheaper), then get aquaz t5 actinic pro..54W per tube for a 4ft tank...
go straight for 14kk and solve all your problems...but your corals may not enjoy it...
another issue, wat are u going to keep? SPS or LPS or softies??150W might not be enough for SPS...
and try not to put light-demanding corals (clams) on your sandbed if u are using 150W, your tank is too tall...
try to position your lights as close as possible to the water surface, but not too close to get salt spray...
i used to have 2X150W for my 3ft tank..2 X profantic fans worked well for me..of cos, i had to work hard on water top ups as well...