So I just found another inaccuracy that doesn’t bother me, over in the “anachronism” thread:
While I understand that real lighting in historical era will be much dimmer than we are used to, film is ultimately a visual medium, and so you need enough light for the viewers to see what’s going on. Unless the darkness is an important plot point, like in a horror movie or the like, I’ll largely overlook artificially bright scenes like this.