The lenses are made of Prism Crystal and originally cost
about £5,500 ($11,000) and were made by Chance Bros. Birmingham,
England. All the parts were supplied in kit form and put together as the
tower was constructed. Todays value of the lens is approximately $5 million.
The original mantle gave a light of approximately 1455 candlepower which
was magnified 836 times giving a reflected light 1.2 million candlepower.
The light source is now a 120 volt 1000 watt tungsten halogen globe with
a similar back-up globe. There is also an automatic back-up generator in
case of a power failure. An alarm system was connected to the keepers house
in case of a complete breakdown. |