luminous efficacy

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efficacy, luminous

The amount of light emitted by a lamp for each watt of power consumed. It is expressed in lumens/watt.
References in periodicals archive ?
The following formula is used to calculate the efficiency of Fluorescent Lamp Sign Ballasts according to DOE standards, which is based on ballast luminous efficiency (BLE) calculations.
Two classes, blue-yellow (tritan) or red-green, have been described but relative luminous efficiency and hue discrimination loss varies individually (see Table 3).
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.
The scotopic spectral luminous efficiency V'([lambda]) is based on the rod photoreceptor responsivity of the eye.
Viera boosts luminous efficiency, and the IPS alpha panel offers the best viewing angle possible.
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.
Also, mass production of white LEDs (light-emitting diodes) has begun, and their luminous efficiency reportedly surpasses that of incandescent light bulbs and nearly surpasses that of fluorescent lamps.
As a result, there is a growing interest in increasing their luminous efficiency through a better understanding of the processes that govem their operation.
To preserve image brightness, passives need high voltage drive electronics and lead to a consequent 10 percent loss of luminous efficiency.
Since LED lighting has excellent luminous efficiency compared to the existing lighting fixtures such as incandescent lamps or fluorescent lamps, it is considered as one of representative energy-saving technologies that can greatly contribute to energy conservation