Many of the different types of LEDs Ive used to replace the incandescent lighting in & around my home have now failed, multiple times.
The LEDs themselves have died either partially or completely in the types with elongated LEDs and series of LED arrays. The other types (of LED lamps) have had (other than LED) board component failures e.g. all the magic blue smoke has escaped.
I attribute the failures to poor fabrication and/or poor workmanship. The problem is trying to find the good stuff.
Your peer reviewed scientific/medical journal source for this claim is?
We have pretty good luck with the longevity of the Cree brand.