<a href=showthread.php?s=&postid=14995739#post14995739 target=_blank>Originally posted</a> by DarG
The Advance T5 HO ballasts are compatible and like the other poster stated, about 40 dollars for a dual (54 watt x 2) and under 60 dollars for a quad (54 watt X 4).
But I do think that some of the Workhorse ballasts are also the proper type for T5 HO but not all of the models ... and there are a lot of Workhorse models. I could be wrong though, I dont use them.