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He does seem to make reference to a lamp on a post in Lord of the RingsThe Lord of the Rings:

Fellowship of the Ring: Chapter 5: A Conspiracy Unmasked

The white bollards near the water's edge glimmered in the light of two lamps on high posts.

While not technically the word "lamp-post"...if the shoe fits

A more tenuous example:

Return of the King: Chapter 1: Minis Tirith

..thence a long lamp-lit slope ran up the seventh gate

He does seem to make reference to a lamp on a post in Lord of the Rings:

Fellowship of the Ring: Chapter 5: A Conspiracy Unmasked

The white bollards near the water's edge glimmered in the light of two lamps on high posts.

While not technically the word "lamp-post"...if the shoe fits

A more tenuous example:

Return of the King: Chapter 1: Minis Tirith

..thence a long lamp-lit slope ran up the seventh gate

He does seem to make reference to a lamp on a post in The Lord of the Rings:

Fellowship of the Ring: Chapter 5: A Conspiracy Unmasked

The white bollards near the water's edge glimmered in the light of two lamps on high posts.

While not technically the word "lamp-post"...if the shoe fits

A more tenuous example:

Return of the King: Chapter 1: Minis Tirith

..thence a long lamp-lit slope ran up the seventh gate

1
source | link

He does seem to make reference to a lamp on a post in Lord of the Rings:

Fellowship of the Ring: Chapter 5: A Conspiracy Unmasked

The white bollards near the water's edge glimmered in the light of two lamps on high posts.

While not technically the word "lamp-post"...if the shoe fits

A more tenuous example:

Return of the King: Chapter 1: Minis Tirith

..thence a long lamp-lit slope ran up the seventh gate