ray of light vs light beam

ray of light and light beam both are nouns.

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

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

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

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