I don't have first hand experience with VHO. That said, I have heard that the VHO's have a much nicer actinic bulb available to them. That's about the only reason I could see staying with VHO's. T5's now have a MUCH larger range of bulb colours out there which would allow you to add bulbs like the fiji purple, etc.
I'm guessing it's an icecap 660 ballast? I know you can run either VHO or T5HO on those, I wonder if you could do 1 pair of each and get the best of both worlds.
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