Yes, I know, that's not supposed to happen.
I have used some Cree 120W spotlights in various places in the train room. I have noticed that some new Lionel boxes that are traditional orange had faded to a salmon color. An American Flyer silver bay window caboose had the red lettering fade to a pink shade.
Having done biomedical lasers and optics I am familiar with the fact that white LEDs are composed of a white phosphor stimulated by a blue or UV LED. So is there UV leakage thru the phosphor??? I no longer have access to the instrumentation I used to use to test this
Has anyone else had this experience?