I'd use LED lights in there. There are Cree bulbs you can get for not too much. Where did the light come from? I'm guessing it is old and from a boat. Brass is mighty fine, too. Whatever it is, it will look really good on your bike. Nice find!Does look copper, doesn't it? Do believe it is brass, though, which should be more evident when I polish it up. Then I'll need to figure out how to electrify it. Mount a little bulb in there I would guess and put a battery pack in a leather bag.
SB