Planted Tank Guru
Join Date: Jul 2008
Location: East Lansing, MI, USA
A Google search shows this to be a common question, with no educated answers. Based on experience with florescent ballasts and bulb experimentation, I'd guess the T5HO would light. Quality and brightness is a question.
For example, I got some two tube T12 ballasts that will properly run 48", 60", and 72" lamps. Comparing specifications from manufactures suggested they would run two T5HO lamps. They did light up, but that's as good as it got. I've got flashlights that put out more light.
So, I'll suggest selling the VHO setup on a reef forum and purchase a known to work T5HO ballast such as a Fulham Workhorse 7. Diagram 7 shows the wiring.
As to DIY sites on florescent lighting, there are too many with a bit that is correct and lots that isn't, and lots of manufacturers sites with specifications but no DIY info. You'd have to do as I did and slog through a lot of them and build a body of knowledge for your self. I'm fortunate in living near a university with a surplus outlet. I've been able to test a lot of combination's of parts that one wouldn't normally have access to.
After a lot of work and note taking, I've settled on using off the shelf shop lights on bare bottom breeding tanks and used commercial aquarium fixtures on planted and show tanks. The next light setup I DIY will be LED.