I can't find the link at the moment
Dr. Sanjay had a presentation on SCMAS few years ago and the topic was LEDs. Something about the white LEDs wavelength doesn't do much for the corals.
http://reefkeeping.com/issues/2006-03/sj/index.
The cool white LED bulb with that hump is too much & at higher pars the coral can't protect itself & basically implodes, bleaches, won't grow as well ect., or can make certain colors look bland or flat. They also make the overall view too icy & cold to the eye, which we've learned with the inital bue & white LED setups & some of the commercial models that have flooded the market over the last few years.
From RC
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