bvoss,
I'm not sure what happened in your setup, but it is no longer a question whether LEDs work. The debate really should be focused on aesthetics (which is subjective).
Are you a member of the local reef club WAMAS? There are quite a few people that have been running LEDs for a while with success including myself. You could check out the tanks in person. Water chemistry and stability play a much larger role in SPS health, but I think it's easy to blame failures on equipment.
While I am a proponent of LED use, the VIVID tank video really doesn't do much to show real results from LEDs in general. The only thing the video does show is that corals can
look the same when shown immediately under the Radions. It really doesn't do much to address growth or color shifts over time.
One thing to think about for the OP, Dog Boy Dave, is that you may experience die-offs if you were to suddenly put LEDs over your tank. You have many large mature colonies that have taken growth patterns adapted to MH lighting. LED lighting is much more direct and you will get many areas which used to be lit that will now be in the dark due to shading from branches, etc... Those areas will die-off and it will take a while before the corals re-adapt and start growing again. The best way to try LEDs is with small frags that have not yet become accustomed to other forms of lighting. This way, they will grow in relation to the type of lighting they are getting.
All colonies shown below were grown from small frags under the same LED setup still running today.
The tabling acro in the above pic can be seen in the below video from 2010 on the left side tank bottom next to the green montipora. The Turquoise A. Loisettae on the right side of the pic was literally 3 polyps I had rescued. It is not visible in the original 2010 vid, but can be seen in my various growth documentation threads.
<iframe width="560" height="315" src="http://www.youtube.com/embed/Kx0XUiUpxxQ" frameborder="0" allowfullscreen></iframe>
This is a more recent video I shot while playing with the movie function on my DSLR:
<iframe width="560" height="315" src="http://www.youtube.com/embed/BtjHAISFEHM" frameborder="0" allowfullscreen></iframe>
All corals seen in videos were original from end of 2009. No corals have been added in the almost 3 years since documentation began.
I'm not trying to convince anyone to switch to LEDs. On the contrary, I think people should stick with what works for them. I just don't think there should be endless debates on whether it works because it obviously does. Whether it is better than any other forms of lighting depends on your specific situation and needs.
-Robert