I've been running a Vertex Illumina for over a year now. Also added UV modules a few months ago with little change. Greens, purples fluores more with the UV's but I don't think they're anywhere near the UV in a MH. My SPS growth and polyp extension is great but the color is just not as good as as MH, not bad but just not the same. Sorry people, MH has better color. Question is, Is it worth the heat, evap and bulbs? I'm sticking with LED for all these reasons. My theory is LED is lacking UV. You don’t get that sunburn feeling under LED like you do from MH. On another note keep your LED whites low. They can really screw things up.
Here is a picture of my tank, sorry for the crapy photo. Colors are better then this.
Here