beam of light vs light beam

beam of light and light beam both are nouns.

Word	Noun	Adjective	Verb	Adverb
beam of light	Yes	No	No	No
light beam	Yes	No	No	No

As nouns, beam of light and light beam are synonyms defined as:

Other synonyms of beam of light include beam, irradiation, ray, ray of light, shaft, shaft of light.

beam of light (noun)	light beam (noun)
a column of light (as from a beacon)	a column of light (as from a beacon)