You can't manually change the sunlight settings but it might be worth trying your windows on different walls. I think the sunshines very bright from the side of the building facing north or upwards.
Also, if you want light to flood in more evenly then maybe you could put windows on all your walls, so they are all equal. Remenber you could put small ones up high, or larger ones out of the shot of the camera if you don't want to actually see them.
