One word can be used to describe Orphek's PR-156 reef aquarium light: Awesome. Not only is the construction awesome, it's awesomely bright: this is no nano aquarium LED light. With enough PAR output to keep SPS on the bottom of a 48" deep reef tank, this is the first (and only) full spectrum LED light designed for hobbyists with deeper reef aquariums, where previously 250w or 400w metal halides were the only lighting options available.
Visit http://blog.captive-aquatics.com/captive_aquatics/2010/09/orphek-pr-156-reef-aquarium-led-light-review.html for details