light meter vs exposure meter

light meter and exposure meter both are nouns.

Word	Noun	Adjective	Verb	Adverb
light meter	Yes	No	No	No
exposure meter	Yes	No	No	No

As nouns, light meter and exposure meter are synonyms defined as:

light meter and exposure meter: photographic equipment that measures the intensity of light

Other synonyms of light meter include photometer.

light meter (noun)	exposure meter (noun)
photographic equipment that measures the intensity of light	photographic equipment that measures the intensity of light