light beam vs ray of light

light beam and ray of light both are nouns.

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

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

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

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