Does Reflector reflectiveness diminish overtime?

Just wondering if the reflectiveness of some of the more powerful LEDs is reduced overtime? Resulting in a loss of output. Lights like the acebeam x65 & klarus xt etc.

If so roughly how long & by how much?

cheers.

Yeah, they can fog up over time, probably oxidizing.
Depends on how well air sealed the head is i suppose.

Depends if you use it near the ocean, how many temperature changes there are, how much humidity there is, etc.
It should only lose like a few percent over a decade or two if made correctly, nothing significant.

Depends on humidity, air sealed components, geographic area of use, etc…. A few factors that determine diminished capacity of reflector(s).