1000-watt and 400-watt Lamps
The top lamp is 400 watts and mounted in
a base with a wide-beam reflector. This
serves to spread the light out for a wide view from the lake. The bottom lamp is 1,000 watts and mounted in
a base with a narrow-beam reflector.
This provides a narrower beam of light that projects a longer
distance. The 400-watt lamp has a life
of about 20,000 hours (4-1/2 years) while the 1,000-watt lamp has a life of
about 12,000 (2-1/2 years) hours. Care
must be taken to not touch the lamps with bare hands when installing them
because oil from the skin can get on the lamps and create a “hot-spot” that may
break the glass when it heats up during operation. Heat produced by the lamps keeps the lantern room about 10
degrees warmer than the ambient outside temperature. The lamps are turned on and off automatically by photoelectric
cells.
Photoelectric Cells
Rotating Shield
The half-cylinder shield rotates around
the lamps once every 8 seconds creating 4 seconds of light and 4 seconds of
dark. This provides the characteristic
of the light house, known as a 4-second isophase characteristic, so that navigators
can distinguish it from other aids to navigation in the area. The shield is rotated by a 1/8
Gearmotor