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.

---

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

---

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

These methods produced fragile filaments, but their luminous efficiency was higher than that of previous ones.

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

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

They are unknown for the firefly, so that its luminous efficiency only as a light-source can be determined.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew