If you've gotta 29 gal Bio Cube with the spaces built in for 5 LED bars they each have 3 lights (known obviously) but I've finally nailed down the fact each LED is 3/4 watts. (previously unadvertised or stated anywhere on their equipment).
Well, since for coral you need about 150W of T5 I guess 75W of led's should do it. So you just have to get another 50W squeezed in there. But if it is fish only then no problem as is.