The lighthouse original story often involves themes of isolation and mystery. Usually, it's about the keepers of the lighthouse, their daily lives in that desolate place, and the strange things that might happen there. For example, they might face harsh weather conditions and the constant battle against the sea. There could also be elements of psychological stress due to the long - term isolation from the mainland.
The lighthouse in the 'Lighthouse of the Orcas' might be significant as it could serve as a guiding point. It might be a symbol of hope for the characters in the story. Just like lighthouses in real life guide ships at sea, in the story it could be guiding the orcas or the people associated with them in some way.
Honestly, I have no clear idea. It could potentially draw elements from various maritime tales or be a completely fictional creation by the author's imagination.