I heard back from Chris at Aerogarden today, and he's still tracking down info on the LED warranty. He said that their customer service group is having a meeting tomorrow with the guy than can answer the question.
He indicated that the electronics in the LED hood are the same as the CFL model. He said they have very few failures with the CFL units, and when they do, they are quick (manufacturing), rather than long term use failures.
Another tidbit he gave me is that they are planning an LED upgrade option for current CFL Ultra machines. No pricing yet, and probably not available until after the first of the year sometime. No answer yet, on whether or not they're planning LED upgrades for other units. He's going to ask at their meeting tomorrow.
On Facebook, he said that they intentionally slowed down their activity, because it was generally low activity, and the same people contributing over and over. He said my encouragement might prompt them to sit down and see what other ideas they can come up with for engagement.