Lumen maintenance predictions for LED packages

Driel, W.D. van; Schuld, Maria; Jacobs, B.; Commissaris, F.; Eyden, J. van der; Hamon, B.

doi:10.1016/j.microrel.2016.03.018

Cited by 18 publications

(16 citation statements)

References 12 publications

(10 reference statements)

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“…Gradual light output degradation follows an exponential decaying function [21] Θ(t) = exp (− ) (1) where:  t is time in hours;  Θ(t) is the normalized luminous flux output at time t;  α is the decay rate constant derived by a least squares curve-fit;   is the shape parameter. This acceleration model for  follows as [23]:…”

Section: System Reliabilitymentioning

confidence: 99%

“…One of the most important questions arising from a degradation experiment is how many hours an accelerated degradation experiment should last for gathering proper data to allow one to make inference about the product lifetime under the normal use condition. Here, we focus on the convergence of the quantile estimators (such as B10 or B50) to decide whether we are able to make this inference [23]. A Maximum Likelihood (ML) procedure is used to estimate B10 (50) under certain use conditions (T, I).…”

Section: System Reliabilitymentioning

confidence: 99%

See 1 more Smart Citation

LED degradation: From component to system

Hamon

Driel

2016

Microelectronics Reliability

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Human civilization revolves around artificial light. Since its earliest incarnation as firelight to its most recent as electric light, artificial light is at the core of our existence. It has freed us from the temporal and spatial constraints of daylight by allowing us to function equally well night and day, indoors and outdoors. It evolved from open fire, candles, carbon arc lamp, incandescent lamp, fluorescent lamp to what is now on our door step: solid state lighting (SSL). SSL refers to a type of lighting that uses semiconductor light-emitting diodes (LEDs), organic or polymer light-emitting diodes (OLED / PLED) as sources of illumination rather than electrical filaments, plasma (used in arc lamps such as fluorescent lamps), or gas. SSL applications are now at the doorstep of massive market entry into our offices and homes. This penetration is mainly due to the promise of an increased reliability with an energy saving opportunity: a low cost reliable solution. An SSL system is composed of a LED engine with a microelectronics driver(s), integrated in a housing that also provides the optical, sensing and other functions. Knowledge of (system) reliability is crucial for not only the business success of the future SSL applications, but also solving many associated scientific challenges. In practice, a malfunction of the system might be induced by the failure and/or degradation of the subsystems/interfaces. This paper will address the items to ensure high reliability of SSL systems by describing LED degradation from a component and a system perspective.

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Section: System Reliabilitymentioning

confidence: 99%

Section: System Reliabilitymentioning

confidence: 99%

LED degradation: From component to system

Hamon

Driel

2016

Microelectronics Reliability

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“…Therefore smart lighting systems should be used for energy management to reduce consumption. Towards this direction, light emitting diodes (LEDs) have proven to be a promising technology since they combine high efficiency, environmental benefits, high reliability and long lifetimes [8]. LEDs are being used increasingly as low-consumption light sources in many applications [9].…”

Section: Introductionmentioning

confidence: 99%

DALI LED Driver Control System for Lighting Operations Based on Raspberry Pi and Kernel Modules

Adam

2019

Electronics

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Light emitting diodes (LEDs) as an efficient low-consumption lighting technology are being used increasingly in many applications. The move to LED lighting is also changing the way the lighting control systems are designed. Currently, most electronic ballasts and other digital lighting devices implement the Digital Addressable Lighting Interface (DALI) standard. This paper presents a low-cost, low-power effective DALI LED driver controller, based on open-source Raspberry Pi3 microcontroller prototyping platform. The control software is developed as a Linux kernel module under UBUNTU 18.04.2 LTS patched with PREEMPT_RT (Preemptive Real-time) for real-time processing. This dynamically loaded kernel module performs all the processing, communication and control operations of the Raspberry Pi3-based DALI controller with the DALI LED driver and LED luminaire. Software applications written in C and Python were developed for performance testing purposes. The experimental results showed that the proposed system could efficiently and effectively manage DALI LED drivers and perform lighting operations (e.g. dimming). The system can be used for a variety of purposes from personal lighting control needs and experimental research in control of electronic ballasts and other control gears, devices and sensors, to advanced requirements in professional buildings, including energy management, lighting maintenance and usage.

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“…Here, the lumen maintenance lifetime is defined as the time when the maintained percentages of the initial light output fall below a failure threshold. In earlier publication, we have mentioned that there may be a risk in doing this as TM-21 only relies on the behavior of the average LED degradation, instead of taking into account the degradation of all individual LEDs [5,6,7]. In [5] we have presented a more profound statistical analysis that makes the step from TM-21 extrapolation to lumen maintenance on product level.…”

Section: Introductionmentioning

confidence: 99%

“…In earlier publication, we have mentioned that there may be a risk in doing this as TM-21 only relies on the behavior of the average LED degradation, instead of taking into account the degradation of all individual LEDs [5,6,7]. In [5] we have presented a more profound statistical analysis that makes the step from TM-21 extrapolation to lumen maintenance on product level. We investigated different approaches able to perform lumen maintenance extrapolations.…”

Section: Introductionmentioning

confidence: 99%

Lumen maintenance prediction for LEDs — New insights

Jacobs

Driel

Schuld³

2018

2018 19th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and

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Commercial claims for LED-based products in terms of lumen maintenance are fully based on TM-21 extrapolations using LM-80 data. We presented an approach based on statistical data analytics, following the work from Yu & Tseng, at EuroSimE2015. Since then, more LM80 test data came available both for High Power (HP) and Mid Power (MP) LEDs. In this paper, we will present the results of further investigations, where we have taken the work from Meeker into account. This is needed as some commercial claims are based on 10 years of warranty and some service bids provide periods of 20 to 25 years of operation.

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Lumen maintenance predictions for LED packages

Cited by 18 publications

References 12 publications

LED degradation: From component to system

LED degradation: From component to system

DALI LED Driver Control System for Lighting Operations Based on Raspberry Pi and Kernel Modules

Lumen maintenance prediction for LEDs — New insights

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