Hi!
Using only two white tubes make tank looking more "contrast" - I feel personally that corals grow little slower but overall corals looks more "saturated".
You need to check it out - I think that you will like it, it bring some colors back, however I feel that corals grow little slower(probably due less amount of symbiotic algae in corals tissue - however it make them more colored again ;-)
Regards
Przemek
My biggest concern using 2 white bulbs is even spread throughout the tank.My tank is z72x34x24 and i feel that my SPS wouldnt get enough white spectrum
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