The lit-key is used on ways and indicates the lighting of it: https://wiki.openstreetmap.org/wiki/Key:lit https://wiki.openstreetmap.org/wiki/Key:lit The high

The lit-key is used on ways and indicates the lighting of it: https://wiki.openstreetmap.org/wiki/Key:lit https://wiki.openstreetmap.org/wiki/Key:lit The highway=street_lamp tag indicates that there is a lamppost (which can be a navigational aid), but is a much more detailed form of mapping that should be used in addition to the lit-key on the ways themselves.