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

luminous efficiency

[′lü·mə·nəs i′fish·ən·sē]

luminous efficiency

Same as luminous efficacy; also called the luminous coefficient.
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.
"We calculate that if you combine our enhanced quantum dots with the most efficient ultraviolet LED, the hybrid device would have a luminous efficiency of about 40 lumens/watt," reported James McBride, research assistant professor of chemistry who has been involved in the research from its inception.
Efficacy (also known as luminous efficiency) can be calculated as:
Light, by the IES definition, is radiant energy weighted by the luminous efficiency function, V([lambda]).
Viera boosts luminous efficiency, and the IPS alpha panel offers the best viewing angle possible.
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.