I was reading some writings from a gentleman that studied bears for a career. He pointed out something, that now seems so obvious but I had never really put together. That is that color phase bears, are more often found in habitat that is open or above the tree line. He said that his studies showed that pure black bears, even when on a good food source would only stay out exposed to the sun for short periods before they would seek shelter, while color phase bears would often remain in the open all day. He even confirmed this with tagged bears that were caught and implanted with the temperature transducers and with telemetry collars they could measure the body temps from a distance.
I have never seen a color phase black bear in unit 6 in all the years I have hunted it, but they are common farther north were they eat berries out on the open tundra. Coastal Brown bears are also darker than the Toklat and blonde bears I see in the Brooks. It makes sense when you think about it that the dark color that absorbs heat, is a benefit in cold thick cover, but would cause over heating out on the sun baked hills and open tundra.
So with bear season right around the corner, for those that want a color phase bear,, look for and focus your effort on habitat that is more open.