see:
https://wiki.openstreetmap.org/wiki/Tag:navigationaid%3Dals
'Set a node node where the light is' (and not: where the line of lights or the structure is)
in comparing to
https://wiki.openstreetmap.org/wiki/Tag:navigationaid%3Dpapi
'Set a node node in the middle of the 4 lights'
--> I used for 'papi' one node per 'papi' (not 4)

I can't found "one node for structure" in wiki. For me is a single node to less for a lot of lights as marker for a long "line of lights" over few meters (e.g. als or rwt) and not mapping for the renderer.
