Replacement HO Bulbs

[Blue Ram]

I have to replace the 4 HO bulbs in a giesemann infiniti fixture. It has 2 150 MH lights and 4 T5s. When you purchase this fixture retail, it comes with 4 actinic bulbs. From this, I assme all your growth is coming from the light provided by the MH. Would it be of any benefit to use 2 actinic and 2 of something else? I can run 3 separate timers - 1 for MH and 2 for the T5s. The tank is 120 gal and 24" deep. I do want to have some diversity in the tank in terms of coral and will have some SPS. Any suggestions?