luminous efficiency

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

noun

1. 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 V

Example Sentences

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

From Project Gutenberg

This lamp, known as the magnetite-arc, has a luminous efficiency of about 20 lumens per watt with a clear glass globe.

From Project Gutenberg

It immediately became possible to operate it at a higher temperature with a resulting increase of luminous efficiency.

From Project Gutenberg

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

From Project Gutenberg

In these figures the luminous efficiency is the shaded area ÷ total area, 0.43 per cent.

From Project Gutenberg