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 luminous efficiency of the tungsten lamp equipped with such a tinted bulb is still about twice as great as that of the carbon-filament lamp.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

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

The luminous efficiency of a carbon filament is a function of its temperature and it increases very rapidly with increasing temperature.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

The highest luminous efficiency attainable by pure temperature radiation will be reached when the temperature of a normal radiator reaches the vicinity of 10,000°F. to 11,000°F. The melting-points of metals are much lower than this.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew