Lamp posts were conceived for streets but are increasingly found in gardens. The reasons for this are:
A vast number of modern designs for lanterns and posts is available. But their associations are with public streets and so one rarely sees them in gardens. The lamp posts currently used in gardens tend to be:
This situation reminds one of Marshall McLuhan's comment that a medium (eg black and white photography) becomes an art form only when has been superseded by another medium.
Modern lamp post designs are associated with public space
Traditional lamp post designs now look appropriate in gardens