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Luminous vs Photographometer - What's the difference?

luminous | photographometer |

As an adjective luminous

is emitting light; glowing brightly.

As a noun photographometer is

(dated) an instrument for determining the sensibility of the plates employed in photographic processes to luminous rays.

luminous

English

(wikipedia luminous)

Adjective

(en adjective)
  • emitting light; glowing brightly
  • brightly illuminated

    • Synonyms

    * beamful

    Derived terms

    * luminous paint * luminosity

    photographometer

    English

    Noun

    (en noun)
  • (dated) An instrument for determining the sensibility of the plates employed in photographic processes to luminous rays.
    • (Webster 1913)