Seminar on LED Reliability

Date: 02 May 2013 - 02 May 2013

Venue: SIMTech Auditorium, Tower block, Level 3

Thermal management is a major issue to the reliability of LED (light-emitting diode) luminaires. The reliability of LED luminaires depends on a plurality of components. Understanding the reliability analysis of a luminaire will enhance the entire product reliability. Sponsored by PE COI, this seminar provides an update on the latest testing standards and specifications in LED. Participants who wish to learn on how to conduct proper thermal measurement and reliability assessment of LEDs will find this seminar very useful.

Thermal Measurement of High Brightness LEDs by Dr Ronnie Teo, SIMTech Scientist, Precision Measurements Group

High-Brightness Light Emitting Diodes (HB-LEDs) demands aggressive thermal management strategies as it affects the luminosity and lifespan as well as color stability of the lighting source. Currently, luminosity and lifetime (lumens maintenance) of LEDs are dependent on the junction temperature of the LED device. However, there are uncertainties associated with the prediction of junction temperature because there are only indirect ways of measuring and evaluating the temperature. This talk will give an insight on the various measurement techniques to accurately derive the junction temperature of packaged LED. Thermal and preliminary reliability analyses of on-field tested LED streetlight will also be presented.

Reliability methodology for Luminaries System by A/Professor Tan Cher Ming, Nanyang Technological University, School of EEE

Luminaries consist of many different components, and its reliability depends on their component's reliabilities.  In this talk, I will show how one can predict the system reliability based on the different designs and identify the components that will affect the system reliability the most and to evaluate the worth of using better components from the system reliability perspective.  The common causes of failure for the components in the luminaries will also be highlighted.

Estimating LED useful life by Mr Tan Heng Khoon (TUV SUD PSB Pte Ltd)

There is currently no industry standard method of measuring or estimating the lifetime and/or reliability of SSL products, taking the entire system into account such as electronics (eg. the power supply or driver), optics (eg. lenses or reflectors), thermal management system, housing, and related components. This presentation mainly focuses on the performance of a specific light source component (package, module, array) while operating in the thermal environment of a lamp or luminaire. The test standards to be covered are the IES LM-79, IES LM-80 and TM 21, where lumen maintenance will be discussed for the purpose of estimating the LED useful life.


1.00pm    Registration 

1.25pm    Introduction

1.30pm    Thermal Measurement of High Brightness LEDs by Dr Ronnie Teo, SIMTech
               Scientist, Precision Measurements Group

1.50pm    Lab Tour

2.20pm    Tea Break 

2.50pm    Reliability methodology for Luminaries System by A/Professor Tan Cher
               Ming, Nanyang Technological University, School of EEE

3.20pm    Estimating LED useful life by Mr Tan Heng Khoon (TUV SUD PSB Pte Ltd)

4.00pm    End

About the Speakers
Associate Professor Tan Cher Ming has been working in electronic industry since 1984 in the field of reliability.  After 10 years of working in industry, he joined School of Electrical and Electronic Engineering, College of Engineering, NTU as academic staff, and continues his research in reliability and provides consultancy to industry.  He has published 5 books and book chapters, more than 250 international Journal and conference papers in the field of reliability.  He is the fellow of Singapore Quality institute, Fellow of Institute of Engineer, Singapore, Distinguished lecturer of IEEE and senior member of IEEE and ASQ due to his work in reliability.  He has a joint appointment as senior scientist in SIMTech.  He is also the Chair of Certified reliability engineers program for Singapore.

Mr Tan Heng Khoon is currently the Product Manager of TÜV SÜD PSB in the Electrical and Electronics Centre for 20 years. He has been actively involved in the supervision and testing of lighting products, as well as equipment calibration activities. Mr Tan is a SINGLAS approved signatory for lighting products and calibration. He is also the Deputy Chairman of the Singapore Standards Technical Committee for Lamps and Related Equipment, and Work Group Convenor for emergency lighting products and design applications. 

Dr Ronnie Teo  is currently the Reliability Team Lead in Singapore Institute of Manufacturing Technology (SIMTech), focusing on Solid-State Lighting (SSL) devices and Remanufactured components. He has been working on failure analysis and reliability assessment of high-power (opto-)electronics applications since 2001. His research interests include development of accelerated reliability testing methodologies and lifetime prediction model. He was recently appointed as Honorary Lecturer of the University of Glasgow.

Who Should Attend
Scientists, Senior Management, R&D Managers, Engineers, Postgraduates, End-adopters.

Seats are available on first-come, first-served basis. To reserve a place, please register online. Registration for this seminar is free of charge.  

Contact Us
For technical enquiries, please contact Dr Ronnie Teo, Scientist, Email:; Tel: 6793 8351

For Collaborative Industry Project on LED Optics-thermal Management, please contact Mr Tan Chee Tat, Industry Development Manager, Email:; Tel: 6793 8576

For enquiries on Engineering Design and Simulation Initiative, please contact Mr John Lim, Senior Consultant, PE COI, Email:; Tel: 6793 8248