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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.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for luminous efficiency
Historical Examples
  • They are unknown for the firefly, so that its luminous efficiency only as a light-source can be determined.

    Artificial Light M. Luckiesh
  • 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
British Dictionary definitions for luminous efficiency

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
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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