I have the little Grow Spot by that company, and it has worked very well for a bumper crop of Java ferns and moss. The light does look very odd (plants appear black and I thought they were dying, but they are a healthy, lush green), but if no one is looking at it, I can't see how that would matter. You may get better results with the bigger panel, or a smaller tank (using it on a 40 breeder only lights half the tank).
I do get algae growing on the glass closest to the light, but nothing on the plants and it is no worse than the fluorescent lights I have used.
Most of my plants are focused on the center of my 'scape I may
get away with the smaller one.. I may get a bigger one though and try it thanks!