low beam vs ray of light

low beam and ray of light both are nouns.

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

As nouns, ray of light is a hypernym of low beam; that is, ray of light is a word with a broader meaning than low beam:

low beam: the beam of a car's headlights that provides illumination for a short distance
ray of light: a column of light (as from a beacon)

Other hypernyms of low beam include beam, beam of light, irradiation, light beam, ray, shaft, shaft of light.

low beam (noun)	ray of light (noun)
the beam of a car's headlights that provides illumination for a short distance	a column of light (as from a beacon)