Panorama Pro modules are tank mounted, and only sit about six inches above the tank, the color is super customizable as well, and they are dimmable and modular. I have a panorama stunner strip (Magenta) that really sets off the color, but the stunner strips are only supplemental where as the pro modules are good for main tank lighting, they are a bit pricey though for my taste
www.ecoxotic.com
Maybe these could work, but its hard to say, I know you can also buy led bulbs that fit in T5 fixtures, but havent really looked into those.