luminous efficiency

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Luminous efficiency

Visual efficacy of visible radiation, a function of the spectral distribution of the source radiation in accordance with the “spectral luminous efficiency curve,’’ usually for the light-adapted eye or photopic vision, or in some instances for the dark-adapted eye or scotopic vision.

The spectral luminous efficiency of radiant flux is the ratio of luminous efficacy for a given wavelength to the value of maximum luminous efficacy. It is a dimensionless ratio. See Luminous efficacy, Photometry

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

luminous efficiency

[′lü·mə·nəs i′fish·ən·sē]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

luminous efficiency

Same as luminous efficacy; also called the luminous coefficient.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Lighting devices equipped with the high efficiency OLEDs are considered to achieve a luminous efficiency comparable to or higher than that of fluorescent lamps (approx.
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Efficacy (also known as luminous efficiency) can be calculated as:
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In 1998 and 1999, UDC achieved new highs in luminous efficiency which seemed to bear out their theories.
Under laboratory conditions, the transparent white OLED prototype has achieved a luminous efficiency of more than 20 1m/W at a brightness of 1,000 cd/[m.sup.2].
Only spectrally selective films with luminous efficiency constants over 1.0 receive the higher rebate.
The Los Angeles Department of Water and Power's rebate program for window film is based on a film's luminous efficiency constant, a measurement of its ability to simultaneously block heat and transmit light.
An erroneous result is also achieved by photometric measurement of the ideal lamp, represented by the normalized bell curve in Figure 2a, which shows the lamp's degree of brightness based on the response curve (or the normalized photopic spectral luminous efficiency curve) of a standard human retina.
When used in LEDs, for example, it will be possible to enhance luminous efficiency by about 30%.
Through steady advances in luminous efficiency, a measure of the amount of light [in lumens (lm)] produced by a given unit of energy [in watts (W)] over the last 20 years, LEDs have achieved significant penetration of such monochrome applications as traffic lights, exit signs, and automotive taillights.