orphek and Kriesel (sp?) make multi chip LED cannon that uses a mix of different colors vs. the Ecoxotic solution which uses one color. Meant to be a halide replacement (ie. strong point source light).
keep an eye out on Dave Fason of Nano Box. He's a hobbyiest doing some CRAZY custom stuff with LEDs that he's trying to bring into the mainstream market.
http://nano-box-reef.com/blog/?categ...me=nanoboxnews
the NANO Pulsar looks pretty awesome and might be something you big tank folk may want to consider vs. a $5000 fixture. He's got a pretty sweet controller (Ryujin)designed for the system as well.