How long do LED shop/ceiling lights really last at full output anyway?

In another thread, the topic came up that LED lights may not last as long
nor as bright as claimed on the package:

Lights of America exaggerated LED light bulb performance
http://archive.jsonline.com/blogs/news/246355581.html
http://green.blogs.nytimes.com/2010/...ed-bulb-maker/

Since the failure mechanism is electronic as much as it's the fact that LEDs
diminish in light output over time, I wondered how long the LED lights (the
entire unit, including electronics) really last, and, what "rules" were in
place for the claims on the package (since I never get the life that the
fluorescent or incandescent bulbs claim either).

As just one (admittedly egregious) example, the bulbs referenced above:

CLAIM: Replaces light output from a 40 Watt bulb (aka 400 lumens)
TESTS: The F.T.C. found the bulbs produced only 74 lumens of light

CLAIM: The LED bulbs in question would last 30,000 hours
TESTS: They lost 80 percent of their light output after only 1,000 hours

That didn't even cover sudden failure from the electronics.

So, I wonder aloud ...
How long do LED shop/ceiling lights really last at full output anyway?