heres the nano reef thread similar to the reef central one mentioned earlier on LED aesthetics.
http://www.nano-reef.com/forums/inde...owtopic=246394
their genral consensus is 2:1 royal blue:neutral white with supplemental blue(or cool blue as they call in the thread) gives the best overall look, there are mentions of good results with adding deep red (660) and true violet as well.
its a good read if you have the time, alot of time.