I have been ultra interested in LED lighting over the last several months. It started at the Lansing frag swap in February 2009, with the display by the
PFO people of their latest
Soleris system. Alas, it was also their last system, as they are no more. But the concept fascinated me.
Came to research quite a bit.... and learned that industry minds are starting to turn as well. Reef lighting guru
Tullio del Aquilla recently stated that LED lighting is good enough now to claim that all other
actinics are obsolete... and that the next generation of lights will start giving T5 and
MH serious challenges.
Most designers (and
DIYers) have focused on the larger 5 watt
LEDs, like the Cree, and placing them in panels (like a
Soleris). I have taken a leap with a company offering a "bulb" that uses smaller
LEDs... 90 per foot, in fact, and installs them inside a T8 "bulb." Really, it's an unbreakable plastic case! So, I'll have 3500
LEDs over my tank: 6 foot bulb x 90
LEDs per foot x 6 bulbs! No ballasts are required.... just a clip over each end (uses the same type of ends that you would see on a T8 bulb) and the wires go straight to the outlet!
The following pic gives you a sense of the color

spectrum. I have started my system with a 12k, a 16k, two 22k, and a pair of
actinics (440mm and 470mm).
Each bulbs uses a minuscule 28w!! For those counting electrical use, I have cut $35 to $40 per month from my electric bill over my halide system (2x 250w and 1x 175 magnetic ballast, plus 2x96w PC actinic).

The bulbs come with wire clips... again, pictured. Very simple... lamp cord, which plugs directly into the wall. NO Ballasts!!!!

My mounting is somewhat a cheesy DIY effort.... simple but effective! I picked up some scrap molding from Home depot, drilled 1 1/4" holes, and mounted them to my canopy. Inset bulbs, and we have liftoff.
(p.s. -- the two clear 18" tubes are
ebay moonlites.)