Everything with T5 lights depends on the ballast and reflectors. There are some very low powered ballasts used on T5HO lights, and some very poor reflectors used on them too. But, there are also many very good ballasts, full powered, and very good reflectors. Can you take a photo of the reflector/bulb area of the light and let us see what we think of it? That won't tell us if the ballast is good or not, but it at least removes one of the unknowns.