luminous efficacy

Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

efficacy, luminous

The amount of light emitted by a lamp for each watt of power consumed. It is expressed in lumens/watt.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
When hourly solar radiation data are available, instantaneous daylight illuminance data can be estimated using luminous efficacy models.
The dependence of luminous efficacy on the CCT setting is presented in Fig.
The luminous intensity of monochromatic radiation in a given direction, [I.sub.v], is related to the radiant intensity of the radiation, [I.sub.e], and the spectral luminous efficacy of the radiation at the frequency of the radiation, K, by the equation [I.sub.v] = [I.sub.e] K.
Tokyo, Sept 29, 2011 - (JCN Newswire) - Sharp Corporation has developed and will introduce a high-power LED lighting device that features the industry's highest luminous efficacy of 93.3 lm/W(1) (lumens/watt) in the 50W input power class as a light source for applications such as downlighting in retail stores.
"Luminous efficacy constant" measures the ability to simultaneously block heat and transmit light.
This is illustrated by the Los Angeles Department of Water and Power's (LADWP) rebate program for window film, which is based on a film's luminous efficacy constant, a measurement of its ability to simultaneously block heat and transmit light.
Further research into the SPE technology could result in even higher levels of light output and greater luminous efficacy, according to Narendran.
LED-based solutions can beat filtered incandescent lamps by a substantial luminous efficacy margin in practically all monochrome signaling applications.
Today, with the development of solid-state lighting and soon, OLEDs, we have become so immersed in quantitative lighting standards, codes and luminous efficacy without any regard for quality or visual comfort.
Ohno, "Color rendering and luminous efficacy of white LED spectra," in 4th International Conference on Solid State Lighting, vol.
These 12.5W GL-AR111-V2-12 LED lamps offer a luminous efficacy of up to 86 lumens per watt and have 80% lower energy usage when compared to traditional lamps.