Jeff Liebermann writes:

On Mon, 31 Oct 2016 19:08:08 +0000 (UTC), Algeria Horan
wrote:

But what do you get for a 70%-illumination lifetime in the real world?

root,

Believe it or not, the tests are designed to reflect real world usage.

You keep implying that there is something wrong with all advertised
LED bulb lifetimes. Then you tell us you need to Google search to
find out if that's true.

Dunno. Your real world LED application is not the same as my real
world LED application and the science fiction world of marketing tech
products.
....
Few run 30,000 hr tests. At 8,760 hrs/year, it would take over three
years to run the test, by which time the product is obsolete and
replaced by something new and improved.

Jeff,

Actually, 3 years wouldn't be useful for anything but the decidedly
"not realworld" test case of continuous use.

It would take considerably more than 3 years to test the common
on at night, off during the day test case.

Instead, they run a HALT
(Highly Accelerated Life Test), which is faster, and presumably
produces the necessary inflated figures:

You could have left the word "inflated" out of that sentence.
It's an insult to the rather clever testing that you described.

.... snipped test description.

--
Dan Espen