Comment by Ekaros
Leds themselves are often fine for long time. It is the circuits they are powered by that are very often crap, poorly designed, specified, too cheap. So heat can kill it. Or like my last cheap powerful bulb in kitchen that flickers when I have certain controlled resistive loads on.
I wonder how many tests are run in actual enclosures for example. Which for example might not dissipate enough heat.
One of the dead lights that died was above the stove so could be heat related. Other 2 maybe just bad circuits...
I think it is too expensive to run tests in real life changing conditions