My older LED 'spotlights' have a blue tint and low output. I'don't know whether that is slow deterioration, but the more recent LED lights are much better.
I have several of the IKEA lights, I find that the light tends to flicker, which I attribute to the low voltage and/or current being unable to clean the switch contacts. I read someone's blog a while ago, replacing the switches with silver contact switches, less prone to this problem.
Bill