luminous efficiency

American  

noun

Optics.

1. the perceived brightness of light as a ratio of the total luminous flux to total radiant flux of the source; a measure of brightness obtained by dividing the source's luminous flux by the consumption of its energy.

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luminous efficiency British  

noun

1.  V.  the efficiency of polychromatic radiation in producing a visual sensation. It is the radiant flux weighed according to the spectral luminous efficiencies of its constituent wavelengths divided by the corresponding radiant flux

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Example Sentences

The experiment was undertaken in the hope that shaped charges would help answer some important questions in meteor physics, e.g., controlled experiments concerning the luminous efficiency of meteors and other hypervelocity effects.

From Time Magazine Archive

The visibility or luminous efficiency of radiant energy may be ranged approximately in this manner according to the colors aroused: yellow-green, yellow, green, orange, blue-green, red, blue, deep red, violet.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

All this time its luminous efficiency is increasing, because it is radiating not only an increasing percentage of visible radiant energy but an increasing amount of the most effective luminous energy.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

It is natural to inquire whether or not any mode of light-production now in use has a limiting luminous efficiency approaching the ultimate limit which is imposed by the visibility of radiation.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

If such a white light were obtained by pure temperature radiation—that is, by a normal radiator at a temperature of 10,000°F., which is impracticable at present—the luminous efficiency would be about 100 lumens per watt.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew