light beam vs beam of light

light beam and beam of light both are nouns.

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

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

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

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