I have a halide/T5 combo fixture where my T5s are strictly 22K/actinic accent lights. What I have noticed is that even the accent lights lose their colour after a while. My 22Ks are a lot less 22K and more like 15 or 18K. My actinics are dull and just don't accent coral colours as well as when they are brand new. As a result I like to swap them out at least once a year. Once I put in the new accent lights I can immediately tell the difference in brightness and intensity. So ya, I think all bulbs just get old and worn down after time. Some faster and more noticeable than others.
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