Insights into accelerated aging of SSL luminaires

Davis, J. Lynn; Lamvik, Michael; Bittle, James; Shepherd, Sarah; Yaga, Robert; Baldasaro, Nick; Solano, Eric; Bobashev, Georgiy

doi:10.1117/12.2025295

Title: Insights into accelerated aging of SSL luminaires

Abstract

Although solid-state lighting (SSL) products are often intended to have product lifetimes of 15 years or more, the rapid change in technology has created a need for accelerated life tests (ALTs) that can be performed in the span of several months. A critical element of interpreting results from any systems-level ALT is understanding of the impact of the test environment on each component. Because of its ubiquity in electronics, the use of temperature-humidity environments as potential ALTs for SSL luminaires was investigated. Results from testing of populations of three commercial 6” downlights in environments of 85oC and 85% relative humidity (RH) and 75oC and 75% RH are reported. These test environments were found to accelerate lumen depreciation of the entire luminaire optical system, including LEDs, lenses, and reflectors. The effects of aging were found to depend strongly on both the optical materials that were used and the design of the luminaire; this shows that the lumen maintenance behavior of SSL luminaires must be addressed at the optical systems level. Temperature-Humidity ALTs can be a useful test in understand lumainaire depreciation provided that proper consideration is given to the different aging rates of various materials. Since the impact of the temperature-humiditymore »« less

Authors:

Davis, J. Lynn ^[1]; Lamvik, Michael ^[1]; Bittle, James ^[1]; Shepherd, Sarah ^[1]; Yaga, Robert ^[1]; Baldasaro, Nick ^[1]; Solano, Eric ^[1]; Bobashev, Georgiy ^[1]

RTI International, Research Triangle Park, NC (United States)

Publication Date:: Mon Sep 30 00:00:00 EDT 2013

Research Org.:: RTI International, Research Triangle Park, NC (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office

OSTI Identifier:: 1212866

Grant/Contract Number:: EE0005124

Resource Type:: Accepted Manuscript

Journal Name:: Proceedings of SPIE - The International Society for Optical Engineering

Additional Journal Information:: Journal Volume: 8835; Journal ID: ISSN 0277-786X

Publisher:: SPIE

Country of Publication:: United States

Language:: English

Subject:: 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION

Citation Formats


                    Davis, J. Lynn, Lamvik, Michael, Bittle, James, Shepherd, Sarah, Yaga, Robert, Baldasaro, Nick, Solano, Eric, and Bobashev, Georgiy. Insights into accelerated aging of SSL luminaires.  United States: N. p., 2013. 
Web.  doi:10.1117/12.2025295.

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                    Davis, J. Lynn, Lamvik, Michael, Bittle, James, Shepherd, Sarah, Yaga, Robert, Baldasaro, Nick, Solano, Eric, & Bobashev, Georgiy. Insights into accelerated aging of SSL luminaires.  United States.  https://doi.org/10.1117/12.2025295

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                    Davis, J. Lynn, Lamvik, Michael, Bittle, James, Shepherd, Sarah, Yaga, Robert, Baldasaro, Nick, Solano, Eric, and Bobashev, Georgiy. Mon .  
"Insights into accelerated aging of SSL luminaires".  United States.  https://doi.org/10.1117/12.2025295.  https://www.osti.gov/servlets/purl/1212866.

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@article{osti_1212866,

  title        = {Insights into accelerated aging of SSL luminaires},

  author       = {Davis, J. Lynn and Lamvik, Michael and Bittle, James and Shepherd, Sarah and Yaga, Robert and Baldasaro, Nick and Solano, Eric and Bobashev, Georgiy},

  abstractNote = {Although solid-state lighting (SSL) products are often intended to have product lifetimes of 15 years or more, the rapid change in technology has created a need for accelerated life tests (ALTs) that can be performed in the span of several months. A critical element of interpreting results from any systems-level ALT is understanding of the impact of the test environment on each component. Because of its ubiquity in electronics, the use of temperature-humidity environments as potential ALTs for SSL luminaires was investigated. Results from testing of populations of three commercial 6” downlights in environments of 85oC and 85% relative humidity (RH) and 75oC and 75% RH are reported. These test environments were found to accelerate lumen depreciation of the entire luminaire optical system, including LEDs, lenses, and reflectors. The effects of aging were found to depend strongly on both the optical materials that were used and the design of the luminaire; this shows that the lumen maintenance behavior of SSL luminaires must be addressed at the optical systems level. Temperature-Humidity ALTs can be a useful test in understand lumainaire depreciation provided that proper consideration is given to the different aging rates of various materials. Since the impact of the temperature-humidity environment varies among components of the optical system, uniform aging of all system components in a single test is difficult to achieve.},

  doi          = {10.1117/12.2025295},

  journal      = {Proceedings of SPIE - The International Society for Optical Engineering},

  number       = ,

  volume       = 8835,

  place        = {United States},

  year         = {Mon Sep 30 00:00:00 EDT 2013},

  month        = {Mon Sep 30 00:00:00 EDT 2013}

}

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Works referencing / citing this record:

Study on the Degradation of Optical Silicone Exposed to Harsh Environments
journal, July 2018

Yazdan Mehr, Maryam; van Driel, Willem; De Buyl, Francois
Materials, Vol. 11, Issue 8
DOI: 10.3390/ma11081305

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New understandings of failure modes in SSL luminaires

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As SSL products are being rapidly introduced into the market, there is a need to develop standard screening and testing protocols that can be performed quickly and provide data surrounding product lifetime and performance. These protocols, derived from standard industry tests, are known as ALTs (accelerated life tests) and can be performed in a timeframe of weeks to months instead of years. Accelerated testing utilizes a combination of elevated temperature and humidity conditions as well as electrical power cycling to control aging of the luminaires. In this study, we report on the findings of failure modes for two different luminairemore »« less
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This paper will show an investigation of off-the-shelf luminaires with the focus on the LED electronic drivers, specifically the aluminum electrolytic capacitors (AECs), that have been aged using high temperature shelf life (HTSL) testing of 135°C in order to prognosticate the remaining useful life of the luminaires. Luminaires have the potential of seeing excessive temperatures when being transported across country or being stored in non-climate controlled warehouses. They are also being used in outdoor applications in desert environments that see little or no humidity but will experience extremely high temperatures during the day. This makes it important to increase ourmore »« less
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Changes in SSL Device Efficiency and Optical Performance Under Accelerated Aging Conditions

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Lighting application efficiency (LAE) describes the efficient delivery of light from the light source to the lighted task and is viewed as a new frontier—increasing energy savings with solid-state lighting (SSL) technologies. The framework for LAE that is proposed by the U.S. Department of Energy (DOE) consists of four major elements: light source efficiency, optical delivery efficiency, spectral efficiency, and intensity effectiveness. This report focuses on a sampling of the available SSL products that can be broadly defined as having modified spectral output because the method of spectra modification has a significant impact on light source efficiency and long-term opticalmore »« less
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Meeting the longevity requirements of solid-state lighting (SSL) devices places extreme demands on the materials and designs that are used in SSL luminaires. Therefore, understanding the aging characteristics of lens, reflectors, and other materials is essential to projecting the long-term performance of LED-based lighting systems. Overlooking these factors at either the design or product specification stage can result in premature failure of the device due to poor luminous flux maintenance and/or excessive chromaticity shifts. This paper describes a methodology for performing accelerated stress testing (AST) on materials intended for use in SSL luminaires. This test methodology, which consists of elevatedmore »« less
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Title: Insights into accelerated aging of SSL luminaires

Abstract

Citation Formats

Study on the Degradation of Optical Silicone Exposed to Harsh Environments journal, July 2018

Study on the Degradation of Optical Silicone Exposed to Harsh Environments
journal, July 2018