Il existe un ouvrage intitulé le Livre des feux, des bouées et des signaux de brume qui couvre différentes régions du pays, et on y mentionne que chaque phare a son propre signal lumineux qui est visible la nuit.
There is a book called The List of Lights, Buoys and Fog Signals for various parts of the country, and every lighthouse has its own flash pattern that you can see at night.