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Title: Demonstration of Recessed Downlight Technologies: Power and Illumination Assessment

Abstract

Solid state lighting (SSL), specifically light-emitting diodes (LED), has been advancing at a rapid pace, and there are presently multiple products available that serve as direct replacements for traditional luminaires. In this demonstration, conventional recessed lights in a conference room were used to compare conventional incandescent A-lamps, incandescent reflector R-lamps, dimming compact fluorescent lamps (CFL), to an LED replacement product. The primary focus during the study was on light delivered to the task plane as provided by the power required by the lighting system. Vertical illuminance, dimming range, and color shift are also important indicators of lighting quality and are discussed in the report. The results clearly showed that LEDs, with dimming-capable drivers, are much more efficient than incandescent and CFLs. Further, LEDs provide much smoother and consistent dimming than dimmable CFLs. On the potential negative side, it is important that the dimming switch be identified as compatible with the LED driver. A wide variety of dimmer switches are capable of dimming LEDs down to 15% of full light output, while select others can be capable of dimming LEDs down to 5%. In addition, LEDs can be intensive light sources, which can result in uncomfortable glare in some applications andmore » to some occupants. Higher ceiling (9-foot or greater) or non-specular reflectors can act to alleviate the potential for glare.« less

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
971108
Report Number(s):
PNNL-18860
EL1703010; TRN: US201114%%77
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; COLOR; FLUORESCENT LAMPS; ILLUMINANCE; LIGHT SOURCES; LIGHTING SYSTEMS; OCCUPANTS; SWITCHES

Citation Formats

Parker, Steven A, and Beeson, Tracy A. Demonstration of Recessed Downlight Technologies: Power and Illumination Assessment. United States: N. p., 2009. Web. doi:10.2172/971108.
Parker, Steven A, & Beeson, Tracy A. Demonstration of Recessed Downlight Technologies: Power and Illumination Assessment. United States. https://doi.org/10.2172/971108
Parker, Steven A, and Beeson, Tracy A. 2009. "Demonstration of Recessed Downlight Technologies: Power and Illumination Assessment". United States. https://doi.org/10.2172/971108. https://www.osti.gov/servlets/purl/971108.
@article{osti_971108,
title = {Demonstration of Recessed Downlight Technologies: Power and Illumination Assessment},
author = {Parker, Steven A and Beeson, Tracy A},
abstractNote = {Solid state lighting (SSL), specifically light-emitting diodes (LED), has been advancing at a rapid pace, and there are presently multiple products available that serve as direct replacements for traditional luminaires. In this demonstration, conventional recessed lights in a conference room were used to compare conventional incandescent A-lamps, incandescent reflector R-lamps, dimming compact fluorescent lamps (CFL), to an LED replacement product. The primary focus during the study was on light delivered to the task plane as provided by the power required by the lighting system. Vertical illuminance, dimming range, and color shift are also important indicators of lighting quality and are discussed in the report. The results clearly showed that LEDs, with dimming-capable drivers, are much more efficient than incandescent and CFLs. Further, LEDs provide much smoother and consistent dimming than dimmable CFLs. On the potential negative side, it is important that the dimming switch be identified as compatible with the LED driver. A wide variety of dimmer switches are capable of dimming LEDs down to 15% of full light output, while select others can be capable of dimming LEDs down to 5%. In addition, LEDs can be intensive light sources, which can result in uncomfortable glare in some applications and to some occupants. Higher ceiling (9-foot or greater) or non-specular reflectors can act to alleviate the potential for glare.},
doi = {10.2172/971108},
url = {https://www.osti.gov/biblio/971108}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {11}
}