A Reef Creation was using LED's (they had LEDs last year on their setup as well), but I believe most of what they had were LPS (Scoly's, Acans, Chalices), which in my experience can basically be grown in the dark (less than 100 PAR) and most look better the bluer the spectrum. Also, I didn't look at the ratio of blues to whites... but can imagine there weren't many whites in the mix. They definitely had some primo stuff, and it all looked amazing.
I really don't think there's a question anymore whether coral can live under LEDs, and the blue LEDs really seem to pop some crazy colors. However, I'm going to be interested in the growth rates/colors with regards to SPS as more "hobbyists" make the transition and we begin to see some sustained results.