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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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for luminous efficiency
Historical Examples
  • The luminous efficiency of a light-source is distinguished from that of a lamp.

    Artificial Light M. Luckiesh
  • In these figures the luminous efficiency is the shaded area ÷ total area, 0.43 per cent.

    The Nature of Animal Light E. Newton Harvey
  • This lamp, known as the magnetite-arc, has a luminous efficiency of about 20 lumens per watt with a clear glass globe.

    Artificial Light M. Luckiesh
  • It immediately became possible to operate it at a higher temperature with a resulting increase of luminous efficiency.

    Artificial Light M. Luckiesh
  • These methods produced fragile filaments, but their luminous efficiency was higher than that of previous ones.

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

    Artificial Light M. Luckiesh
British Dictionary definitions for luminous efficiency

luminous efficiency

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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