I have only one thing to add regarding your installation, as regards the type of screws you used during your light installation. I would suggest that whatever fasteners you use, that they be stainless steel. If you use common ferrous wood screws, you'll find that they will leave rust streaks later on down the road as they start to rust and corrode. It's easy to check them with a magnet...if they are attracted to the magnet, they aren't stainless steel and will eventually rust.
"Government doesn't have an answer to the problem, government is the problem." Ronald Reagan