ReefGeek has an interesting new lighting fixture - AquaIllumination LED Light Systems. They say it is capable of producing as much light as a 400w halide system with only 50% of the energy!
AquaIllumination LED Light Systems
This aquarium lighting fixture has sunrise, daylight, sunset and lunar light cycles. All that and a lamp life of up to 10 years.

Are LEDs here to stay?
More info:
http://www.reefgeek.com/lighting/LED...Light_Systems/