I thought this might be a good opportunity to give you a brief history of the Bris Menorah which stands on the side of the Aron HaKodesh opposite the Chanuka Menorah. (To see both menorahs in one photo, refer to this post.)
The Bris Miloh Menorah in our Bais Haknesses contains three sets of lights to accomodate the possibility of three bris milos taking place on one day or within three days of each other.
Each set of lights consists of one large center light surrounded by twelve small ones. On the day of the bris all the lights are lit. On the second and third day only the center light remains lit.
The twelve small lights represent the twelve shevotim. With the bris miloh the little boy is now officialy a part of Klal Yisroel. The center light represents a light of shemiroh (protection). We know from the Torah that the first three days after the miloh are the most critical and this light serves as a protection over any danger that might occur.
In Frankfurt, the Bris Miloh Menorah had a gas light in the center and was surrounded by twelve candles. I have been told that after davening, the mohel used to take the twelve candles and use them at the Bris Miloh seudoh.
When our shul was located in 90 Bennett Avenue, across the street from its current location, the menorah had an electric bulb in the center which was surrounded by twelve candles. When the new shul was built the menorah was completely electrified.