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What is a luminosity?

What is a luminosity? Here are some definitions.

Noun
  1. (uncountable) the state of being luminous, or a luminous object; brilliance or radiance
  2. (physics) the ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor
  3. (astronomy) the rate at which a star radiates energy in all directions
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Examples
In The Approach, a mostly white painting with edges of yellow-gold, a mystical luminosity is supported by a gnomic title.
Below you will find a number of references containing recent work on low mass, low luminosity stars and substellar objects.
There was a general feeling of relief when we saw the sky lit up with a red luminosity and we knew it was the lights of our city ahead.
The director's visual style, one that incorporates a great deal of light and luminosity, tends to fade the picture.
In the transparency of watercolor, the thin veils of color lapping the underlying white paper capture the city's luminosity.
Snow, at a modest 30 by 32 inches, stood out in this exhibition for the luminosity of its light palette and relatively open structure.

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