I have the 8" inch light on a Innovative Marine Nuvo-Fusion 10gallon. The tank is 13inches deep. The light is very sleek and the attachment bracket has a low profile. The light sits approx 5-6 inches above the tank.
With that said it is very bright provides total coverage of the aquarium. I'm currently stocking zoas and LPS (mostly Acans) and all are doing great. You can adjust the white or blue light intensity and it has a timer function with dawn and dusk capabilities (check YouTube). Nothing fancy but for the price it is well worth the investment!
But, IMO you might want something a little more powerful/controllable for SPS.