This postcard was sent by Ania (Poland). It does not include the name of the lighthouse, but I think it is List Ost (in Sylt, Germany).
The back of the postcard was full of lighthouses too!
These stamps belong to http://philatelynews.com/lighthouses-of-poland/ issued on June 19, 2015. The stamps features the lighthouses of Świnoujście, Kikut (the highest light on Poland’s coast), Jastarnia, Gdansk and Rozewie. They also appeared on this postcard, which brought me two more lighthouses of the set.