Forget flowering anything with these but they could be great for veg, plenty of light with the deluxe/pro models to grow some bushy little plants from seed/clone as they have 3 CFL's under a reflective hood and give you two feet of space vertically...it would make alot of sense to prune plants to keep them short and bushy in this set-up. If you wanted to flower with these I believe you can remove the light fixture from the top and put them under a brigther light like a 250/400 hps to flower them in a small space.

People have also added a basic aquarium pump & air stone to oxygenate the nutrient solution as well as used quality hydro nutrients as opposed to the tablets they include with the system.