They also have different fog horn timings as well.

Here is the Icelandic list of lights (isl. Vitaskrá). It includes every light in Iceland. Sailors are supposed to know how to read this and identify a light from their patterns. It is very rear that sailors sail by lighthouses these days though, but an extremely handy skill to have in case your GPS fails for some reason.

https://www.lhg.is/media/sjomaelingar_islands/Vitaskra_31101...

sounds like pulsars.