I have some hives of Carni's in a location that doesn't get sun 'til late in the morning, and some of my Italians in a spot on the other side of the lot that gets sun at the first sight of dawn. My Carni's still get out earlier than those lazy Italians. From the info that I have gathered, foraging is triggered more by temperature than daylight. Carni's are suppose to be a bee for colder climates and tend to get out and forage at 45 degrees, when Italians don't get out foraging until 55 to 60 degrees
I'm not convinced at the temps they are suppose to get out at, but I did some side by side trials last year, in both locations the Carni's were active earlier than the Italians, whether they were in early sun locations or shaded morning locations.