Oh, nice! I didn't remember the specifics of that careful technique you mention with period lighting, but I definitely remembered the effect it had. That movie has a stamp in my memory that says: "Gorgeous-looking and extremely atmospheric," and I'm sure a lot of that comes down to the way they handled light and shadow in dedicated, authentic ways. If I recall correctly, another movie that tries to rely a lot on natural light sources is the 1995 Persuasion, and the effect is again lovely.