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The Lighthouse of Sigri is located on the island of Nisiopi, in front of Sigri's harbour, near the western tip of the Greek island of Lesbos. It is a circular tower which is 12 meters tall and contains a lighthouse keeper house. The light was first exhibited at 1860 with oil as its energy source. The petroleum lantern was replaced by an electric light in 1989. It emits a distinctive white flash every 30 seconds in a luminous range of 21n.m.
The only time when the light was turned off was during the Second World War and it was repaired in 1945. It is still used today for navigation safety.
References
Sigri lighthouse Wikipedia(Text) CC BY-SA