Mateusz Konieczny
I admit, that is an interesting case.

In my opinion, it is not a lighthouse:

Lighthouse is defined as "Tower that emits light to serve as a navigational aid at sea or on inland waterway" at https://wiki.openstreetmap.org/wiki/Tag:man%20made=lighthouse?uselang=en - not "anything that emits light and looks sort of lighthouse"

In this case wiki makes sense and I see no reason to change it