Projecting LED product life based on application

Narendran, Nadarajah; Liu, Yiwei; Mou, Xi; Thotagamuwa, Dinusha R.; Eshwarage, Oshadhi V. Madihe

doi:10.1117/12.2240464

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…A study on LED A-lamps showed that lamps under life testing performed with on-off cycling showed a shorter time to failure relative to continuous life testing. In addition, many lamps failed catastrophically before L70 values were reached -in this case due to solder joint failures and driver electronics failures [79]. The way A-lamps will perform in the field also will strongly depend on the application, whether they are in a downlight fixture or table lamp, but more complete life testing protocols would help identify potential sources of catastrophic failure that may lead lower lifetimes than projected L70.…”

Section: Lumen Maintenancementioning

confidence: 99%

Solid-State Lighting 2017 Suggested Research Topics Supplement: Technology and Market Context

Pattison¹

2017

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AlGaN aluminum gallium nitride AlInGaN aluminum indium gallium nitride AlInGaP aluminum indium gallium phosphide AlN aluminum nitride ANSI American National Standards Institute app software application ASP average selling price BLE Bluetooth Low Energy BR bulged reflector Btu British thermal unit °C degrees Celsius CALiPER Commercially Available LED Product Evaluation and Reporting CCT correlated color temperature cd/m 2 candelas per square meter CFL compact fluorescent lamp CIE Commission Internationale de l'Eclairage CLTB connected lighting test bed cm-LED color mixed-LED COB chip-on-board CRI color rendering index CSA China Solid State Lighting Alliance CSP chip scale package CWF cool white fluorescent DC direct current DLC DesignLights Consortium

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Section: Lumen Maintenancementioning

confidence: 99%

Solid-State Lighting 2017 Suggested Research Topics Supplement: Technology and Market Context

Pattison¹

2017

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“…Currently, standard testing methods consider the lifetime of the LED components rather than the whole system and often focus on lumen depreciation over catastrophic failure (i.e. complete non-functioning) though both are of concern (Narendran et al 2016). Practical methods that can reliably predict the important sources of failure are a necessary first step in setting minimum standards.…”

Section: More Ambitious Mandatory Ecodesign Requirementsmentioning

confidence: 99%

“…drivers, solder between the LED and PCB, etc.) (Narendran et al 2016). While these are promising developments in accelerated testing procedures (Narendran et al 2016;Narendran, personal communication 3 March 2017), there may still be issues with how to establish test methods in legislation and the practical enforcement by member states.…”

Section: More Ambitious Mandatory Ecodesign Requirementsmentioning

confidence: 99%

“…The requirements do not go beyond the 6000-h measurement for practical reasons of time and capacity for such tests and because the dynamic nature of the LED market (as with many electronic products) can create challenges for testing and market surveillance (VITO and VHK 2015a, b). Shorter testing times would be preferred, but this can be a trade-off with reliable testing methods for durability (Narendran et al 2016). This being said, there are also positive developments in accelerated testing methods that may help to address these issues (Narendran et al 2016;Narendran, personal communication, 3 March 2017) and some jurisdictions like California are working with a combination of lumen maintenance and "time to failure" tests to set requirements for minimum rated lifetimes of 10,000-25,000 hours, depending on the LED lamp type (California Energy Commission 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Shorter testing times would be preferred, but this can be a trade-off with reliable testing methods for durability (Narendran et al 2016). This being said, there are also positive developments in accelerated testing methods that may help to address these issues (Narendran et al 2016;Narendran, personal communication, 3 March 2017) and some jurisdictions like California are working with a combination of lumen maintenance and "time to failure" tests to set requirements for minimum rated lifetimes of 10,000-25,000 hours, depending on the LED lamp type (California Energy Commission 2016). 4 Currently, several manufacturers are promoting the long life of LED lamps as a valuable attribute to consumers, with many now sold claiming lifetimes exceeding 50,000 hours (Hixon 2012); however, there is also speculation that lifetimes for LED lamps may be decreasing in the future if business models for longer life products are not viable (MacKinnon 2016).…”

Section: Introductionmentioning

confidence: 99%

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Optimal durability in least life cycle cost methods: the case of LED lamps

et al. 2018

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In the European Union (EU), mandatory durability ecodesign requirements have recently been set for some products, including lighting products; further development of durability standards is also expected in the future. Durability standards can bring environmental and consumer benefits, but the question remains about what optimal durability is. In this paper, the product lifetime aspect of durability is considered, and optimal lifetimes in relation to least life cycle cost (LCC) for the consumer are analysed. The paper focusses the analysis on a case of LED lamps available in an online market in December 2016 and models optimal lifetimes from an LCC perspective. The statistical error of the regression does not allow for calculation of the optima with precision, but the calculation indicates optimal lifetime is close to 25,000 hours. The influence of smaller discount rates and more intensive use of the product are also modelled, which indicate that durability is desirable in intense-use scenarios in particular. The usefulness of the method is discussed and the findings are compared to previous literature and studies examining durability and increased lifetimes for products, including those using an alternative approach of life cycle assessment (LCA). The initial results of this LCC method indicate that longer lifetimes than those currently required by legal standards in the EU could be appropriate for LED lamps. As such, the advantages and disadvantages of different policy instruments to stimulate increased durability are also discussed. The paper concludes with suggestions for potential future research and further policy development.

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