Okay, thanks.
I hate to say this, but a ballast is a ballast. If the fixture is a T5 HO fixture there is actually a good chance that it has better ballasts than some of the cheaper commercial aquarium fixtures. Industry does not normally use workhorse instant start ballasts for t5 ho application, they use the proper programmed start start T5 spec ballasts, while some of the aquarium manufactures use the workhorse ballast since they are less expensive and easier to install. When it comes to MH, an M59 spec ballast is an M59 spec ballast. Aquarium trade uses the same ballasts as industry. Now the reflectors they use I can understand, but I'm sure theres a DIY way of changing it.