Have you considered 2 x 150 watt halides instead? I was running 150 watts over my 24" tank and got tremendous growth with an acro sitting on my sandbed. Then long term electrical costs would be less than dual 250watts.
I was in the same boat and had end caps for vho's and also T5s with a ballast capable of running either, but I opted with going T5's even after I saw the super actinics on the VHO's. I'm running giessman actinic plus for actinic and it is the BOMB with just the actinics on. Anyway, hope this helps.
Des
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