Are you looking for a manufactured mh + LED combo like this one from Reef Brite?
One of our stores up in ottawa has their main display running with halides plus the Reef Brite LED's. Previously they used halide plus VHO but now run the Reef Brites. Now they actually have their timers set to turn the halides off a couple hourse before the store closes so that people can see what the tank looks like with just LED's and its pretty amazing!
I will see if I can dig up some pictures, but it would be on my old lap top.
I snapped some pictures when they did the transfer in feb of 2011 but have since updated my computer.