I had the first version of AI lights. I received them when they were already a little over a year old. I had 6 modules over a 5ft tank. My reef was previously thriving under T5s the only thing I changed was the light. Things I observed: decreased calcification, browning of corals, LPS didn't expand tissue as well, decreasing intensity of the light, at least 15 bulbs burned out by the 2 year mark. I had these lights for one year over my tank and it looked terrible. I finally switched back to T5 (again, the only change). One year later, my tank is finally doing well. Maybe these were flaws from the first models of AI, I can't be sure. I just know that my husbandry skills are top notch and the only changes I made were to the lighting. Another member of our club also had the same experience with bulbs burning out. They offered to fix them for $250 per module. I didn't feel like spending another $1500 on lights that were already so expensive. Obviously LEDs work on some people's tanks. They certainly didn't work on mine or several other of my club members.
LED par values after 2 years, running at 100% intensity:
Burned out bulbs:
<a href="http://s285.photobucket.com/albums/ll45/graha321/?action=view¤t=IMG_1645.jpg" target="_blank"><img src="http://i285.photobucket.com/albums/ll45/graha321/IMG_1645.jpg" border="0" alt="Photobucket"></a>