I'm currently running vhos. I have experimented with bulb type and my first combo of 50/50 and actincs disapointed me so i switched to 1 10k and 3 actincs. I have had great growth of every thing including my montis. I have been curious about the T-5s because I have seen some nice sps tanks with T-5 only. Of course the cost is great. .I think i can run two actinc vhos and 2 10K t-5s off the same ballast so thats an option. I was curious because i was told i could convert my setup to a T-5 setup with out getting a new ballast. I think i will be a work horse ballast and work from the ground up on building this system. I think i can do 4 bulbs with a single workhorse 7. So ill do a work horse 7 and a workhorse 3 to give me a extra pair of bulbs.