In 1914 the pioneering electric light at Souter was replaced with more conventional oil lamps.
At the same time Chance Brothers provided a new, much larger bi-form first-order catadioptric revolving optic, which remains in situ in the tower; as a bi-form lens it is double-height, containing two lamps, one above the other. (
A separate lamp was used for the sector light, lower down in the tower).

In 1952 the lighthouse was again converted to run on (mains) electric power.
The mechanism which caused the optic (lens array) to revolve was driven by clockwork until 1983.

Souter Lighthouse was decommissioned in 1988, but continued to serve as a radio navigation beacon up until 1999 when it was finally closed.
In 1914 the pioneering electric light at Souter was replaced with more conventional oil lamps. At the same time Chance Brothers provided a new, much larger bi-form first-order catadioptric revolving optic, which remains in situ in the tower; as a bi-form lens it is double-height, containing two lamps, one above the other. (A separate lamp was used for the sector light, lower down in the tower).
In 1952 the lighthouse was again converted to run on (mains) electric power. The mechanism which caused the optic (lens array) to revolve was driven by clockwork until 1983.
Souter Lighthouse was decommissioned in 1988, but continued to serve as a radio navigation beacon up until 1999 when it was finally closed.
Souter Lighthouse