Automated in 1910, it accompanies the light of La Vieille in securing the passage of the Raz de Sein, which presents many difficulties.

In 1796, during the Napoleonic Wars, the French ship Séduisant, part of a force intending to invade Ireland, was wrecked on the Tévennec rocks while attempting to pass the Raz de Sein at night.

[4][5] The Tévennec lighthouse, situated to the north of the Raz de Sein, aids navigation through this passage.

[8] It is an early example of a Sector light, with different characteristics (Red/White or flashing rates) indicating safe approach bearings.

According to legend, the first lighthouse keeper, Henri Guezennec, was driven insane by ghostly voices demanding his departure.