I'm using an older Petzl headlamp (Myo XP, 6yrs old) and am under the impression that the LED doesn't deliver as much light as it did when brand new.
This brings me to the other, even older Petzl LED that rests in the shelf now for occasional home use, which is now ~11yrs old and it sure has degraded a lot, I wouldn't consider it usable for hiking any more.
(both Petzls still work perfectly fine, new batteries, etc.).

Whats your experience regarding this topic?