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

Reflectors of a fluorescent red dye have been used with some success, but such a method reduces the luminous efficiency of the lamp considerably.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

A fair average of the retail values of fuels and of electrical energy and an average luminous efficiency of the light-sources involved have been used in making the computations.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

Tests show that, in addition to its higher luminous efficiency, an arc of this character directs a greater percentage of the light into the effective angle of the mirror.

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