Depending on which CREE 120W you have, it has a color temp of 3000K and approx 1200Lumens
Doing research, most of the items that do fade are due to the blue light in the color temp range. Also, another big factor with things like boxes, is what pigments were used in the color process.
In our music studio, we have all lights (can, spot, beam) are now LED. Keeps things nice and cool. I have not noticed any type of fading of anything that sits under these lights that are pretty much on all the time.
