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Title: Lifetime predictions for dimmable two-channel drivers for color tuning luminaires

Abstract

Two-channel tunable white lighting (TWL) systems represent the next wave of solid-state lighting (SSL) systems and promise flexibility in light environment while maintaining the high reliability and luminous efficacy expected with SSL devices. TWL systems utilize LED assemblies consisting of two different LED spectra (i.e., often a warm white assembly and a cool white assembly) that are integrated into modules. While these systems provide the ability to adjust the lighting spectrum to match the physiology needs of the task at hand, they also are a potentially more complex lighting system from a performance and reliability perspective. We report an initial study on the reliability performance of such lighting systems including an examination of the lumen maintenance and chromaticity stability of warm white and cool white LED assemblies and the multi-channel driver that provides power to the assemblies. Accelerated stress tests including operational bake tests conducted at 75°C and 95°C were used to age the LED modules, while more aggressive temperature and humidity tests were used for the drivers in this study. Small differences in the performance between the two LED assemblies were found and can be attributed to the different phosphor chemistries. The lumen maintenances of both LED assemblies weremore » excellent. The warm white LED assemblies were found to shift slightly in the green color direction over time while the cool white LED assemblies shifted slightly in the yellow color direction. The net result of these chromaticity shifts is a small, barely perceptible reduction in the tuning range after 6,000 hours of exposure to an accelerating elevated temperature of 75°C.« less

Authors:
 [1];  [2];  [2];  [1];  [1]
  1. RTI International, Research Triangle Park, NC (United States)
  2. Finelite Inc., Union City, CA (United States)
Publication Date:
Research Org.:
RTI International, Research Triangle Park, NC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1358543
DOE Contract Number:  
EE0007081
Resource Type:
Conference
Resource Relation:
Conference: The Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, Orlando, FL (United States), 30 May- 2 Jun 2017
Country of Publication:
United States
Language:
English
Subject:
LED; Tunable White Light; Lumen Maintenance; Chromaticity; Driver; Reliability

Citation Formats

Davis, Lynn, Smith, Aaron, Clark, Terry, Mills, Karmann, and Perkins, Curtis. Lifetime predictions for dimmable two-channel drivers for color tuning luminaires. United States: N. p., 2017. Web.
Davis, Lynn, Smith, Aaron, Clark, Terry, Mills, Karmann, & Perkins, Curtis. Lifetime predictions for dimmable two-channel drivers for color tuning luminaires. United States.
Davis, Lynn, Smith, Aaron, Clark, Terry, Mills, Karmann, and Perkins, Curtis. Tue . "Lifetime predictions for dimmable two-channel drivers for color tuning luminaires". United States. doi:. https://www.osti.gov/servlets/purl/1358543.
@article{osti_1358543,
title = {Lifetime predictions for dimmable two-channel drivers for color tuning luminaires},
author = {Davis, Lynn and Smith, Aaron and Clark, Terry and Mills, Karmann and Perkins, Curtis},
abstractNote = {Two-channel tunable white lighting (TWL) systems represent the next wave of solid-state lighting (SSL) systems and promise flexibility in light environment while maintaining the high reliability and luminous efficacy expected with SSL devices. TWL systems utilize LED assemblies consisting of two different LED spectra (i.e., often a warm white assembly and a cool white assembly) that are integrated into modules. While these systems provide the ability to adjust the lighting spectrum to match the physiology needs of the task at hand, they also are a potentially more complex lighting system from a performance and reliability perspective. We report an initial study on the reliability performance of such lighting systems including an examination of the lumen maintenance and chromaticity stability of warm white and cool white LED assemblies and the multi-channel driver that provides power to the assemblies. Accelerated stress tests including operational bake tests conducted at 75°C and 95°C were used to age the LED modules, while more aggressive temperature and humidity tests were used for the drivers in this study. Small differences in the performance between the two LED assemblies were found and can be attributed to the different phosphor chemistries. The lumen maintenances of both LED assemblies were excellent. The warm white LED assemblies were found to shift slightly in the green color direction over time while the cool white LED assemblies shifted slightly in the yellow color direction. The net result of these chromaticity shifts is a small, barely perceptible reduction in the tuning range after 6,000 hours of exposure to an accelerating elevated temperature of 75°C.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 30 00:00:00 EDT 2017},
month = {Tue May 30 00:00:00 EDT 2017}
}

Conference:
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