luminaire efficiency

luminaire efficiency

The ratio of luminous flux emitted by a luminaire to total flux emitted by the lamp or lamps in the luminaire.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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* Luminaire efficiency (% lamp light output transmitted out of the fixture)
Hence both the values of L and [L.sup.-] are corresponded to certain value of luminaries efficiency and can be considered as a measure of such efficiency., i.e the maximum luminaire efficiency corresponds to the maximum values of L or [L.sup.-].
With more increases in source efficacy and luminaire efficiency, we'll soon reach the "tipping point" of 0.5 watts per sq ft, when room controls will be sufficient and costly sophisticated system controls will yield negligible savings in cost.
Luminaire efficiency is defined as the percentage of rated light source lumens that actually exit the luminaire, which is an appropriate definition for luminaires with conventional light sources.
The new fixtures include the PANOS INFINITY professional LED downlight family with up to 2800 delivered lumens at 77 lumens per watt luminaire efficiency; the CRAYON LED downlight delivering 1000 lumens; and the VIVO LED-R LED spotlight and pendant family.
When the common reflectorless incandescent bulb is used in the same type of fixture, much of the light is emitted into the fixture and is converted to heat, reducing the luminaire efficiency.
Thus there results a list of questions which covers the relevant aspects and compliance with international standards: for efficient operation, light engineering aspects need to be specially considered like: luminaire efficiency, luminous intensity distribution, luminous flux distribution, glare restriction unified glare rating (UGR) method.
Luminaire efficiency and color rendition make metal halide preferable to high pressure sodium.
Dirt and dust collect on luminaire surfaces, which must be cleaned to restore luminaire efficiency. These immutable laws of maintenance apply to all lighting systems, including LED.
Using the directionality of LED light sources to attain high luminaire efficiency in combination with specular louvers to provide visual cut-off of the light source, these recessed luminaires provide instant-on switching with zero flicker and a 140-deg beam angle distribution.