This is a vintage filigree light fixture. It is just the housing, it does not contain the actual light. You would need to add that yourself. Also, I believe that it is brass, but am not one hundred percent sure.
What I am sure of is that this is a very nice piece. It looks like it might have sat on a post. There are clips on the bottom where it was connected to something. Take a look at the photos. If you have questions, please e-mail.