I’ve only ever had one LED light fail a Fenix TK-10 which is a cheap Chinese light (in the realm of tactical lights). That was a regulator circuit that died.
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Did Fenix replace it? They are one of the better brands.
No, it was a couple of years old at that point. Honestly I didn’t even ask. I did pick up a Fenix TK 35 that I like - it is *bright*!!! I’ve taken it camping and on some nighttime work - one of my favorites.