Fair enough that you disagree. I have been using T5s since they came out and run a TEK set-up with 8 bulbs over a 72 bow. I also have a set-up with 4 bulbs over a 40 breeder. The color on SPS corals on the 8 bulb set-up blows away the 4. At one time I had a 6 bulb unit over a 30G and pics of that tank can be seen in my gallery. Also Crocea, Maxima, and Gigas clams will benifit greatly from the added light.
The number of bulbs is a matter of preference and in no way would an 8 bulb set-up be overkill if you desire to keep mainly high light demanding livestock. With a 6 to 8 bulb set-up you also have the ability to add a variety of bulbs covering multiple spectrums and color.