Since I don't use T5s I had to do a little reading to understand how they work. I think I figured it out.
A T5 is a scaled down T8. They are smaller than T8s and therefore produce less light. T5HOs are the same size as T5s, but their electrodes are capable of conducting more electric current (produce more light) without burning out. Other than the design of the electrodes, T5 and T5HO lamps are the same.
This is important because it means that you can successfully use any T5HO lamp in your T5 fixture without damaging your fixture or lamp. Since this is the case, I would recommend Zoo Med's "Flora Sun" lamp.
This lamp produces a purple light because purple can stimulate photosynthesis. This has to do with why most plants appear green. ( White Light - Green Light = Purple Light ) There's more to it, but this explanation is sufficient for my discussion.
You may not like the appearance of your tank under a purple light so I would recommend changing the other lamp to a "daylight" (5,800K) lamp.