luminous efficiency

noun Optics.
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
 
n
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
Photometric values are measured by adapting radiometric sensors to match the appropriate luminous efficiency curves.
Photometric values are measured by adapting radiometric sensors with filters to match the appropriate luminous efficiency curves.
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