luminous efficacy


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luminous efficacy

n
1. (Units) the quotient of the luminous flux of a radiation and its corresponding radiant flux. Symbol: K
2. (Units) the quotient of the luminous flux emitted by a source of radiation and the power it consumes. It is measured in lumens per watt. Symbol: ηv or Φv
References in periodicals archive ?
Since the first development of white OLEDs in the 1990s, numerous efforts have been made to achieve a balanced white spectrum and high luminous efficacy at a practical luminance level.
(3) The influence of [Sr.sub.2][Si.sub.5][N.sub.8]:[Eu.sup.2+] concentration on the lighting performance (in terms of correlated colour temperature deviation (D-CCT), Colour Rending Index (CRI), Colour Quality Scale (CQS), and the luminous efficacy) is investigated.
Luminous efficacy in daylight is defined as the ratio of illuminance to solar radiation that is expressed in Lm/W.
His latest invention is a blue laser, also convertible to white light, with twice the luminous efficacy of an LED.
Luminous efficacy of LEDs that can be attained until 2015 is based on the expectation that LEDs will be able to attain 50 % to 70 % of the theoretical maximum.
These light engines feature patented technologies that encompass non-imaging optics with chip-on-board LED arrays on metal core circuit boards to provide both luminous efficacy and high thermal management.
The simulation program can predict not only the relative SPD, chromaticity coordinates, but also numbers of LED (N), drive currents ([I.sub.F]), the input power ([P.sub.in]), the luminous flux ([PHI]), and the luminous efficacy ([eta]) according to requirements of CRI, R9, CCT, and the distance from the Planckian locus on the CIE 1960 uv chromaticity diagram (dC), with polarity, plus (above the Planckian locus) or minus (below the Planckian locus) [15].
Conventional HPS lamps have a long working life, high luminous efficacy, high color temperature, and more comfortable environment [4]; however, the actual service life will shorten sharply when the luminous output changes unsteadily as the voltage fluctuates; in addition, the conventional operation of highway tunnel is restricted by the large electric energy loss, frequent replacement of lamps, light pollution, and thermal radiation produced by the intense light.
Lumisil 885 is an addition-curing silicone rubber of medium viscosity that cures to yield a very transparent, high-durometer elastomer that confers high luminous efficacy in optical applications.
Power consumption, luminous flux, correlated color temperature, CIE Color Rendering Index (CIE CRI) and luminous efficacy of the luminaires were measured using an integrating sphere that measures the spectral power distribution in the wavelength range of 350 to 1050 nm.
GL-TL0606 brings with it a large improvement in luminous efficacy and luminous flux when compared to T8 or T5 fluorescent fixtures.
PIDA's studies show that these suppliers are mostly supplying bulbs rated from 6 to 12 watts as replacements for incandescent bulbs rated from 40 to 60 watts, with their luminous efficacy reaching between 40 and 100 lumens per watt.