Library

Welcome To The SSL Library

Improving the Mp metric for evaluation of Flicker

Jiaye Li and Yoshi Ohno, National Institute of Standards and Technology, and Andrew Bierman, Consultant Abstract Recently TLM (temporal light modulation) related measurements and calculations have regained high interest, with new regulations by European Commission and other regional regulations requiring limits for TLA (temporal light artefacts) quantities for LED lighting products. In these regulations, PstLM (IEC TR 61547-1-2020) for flicker and SVM (TR 63158-2018) for stroboscopic effects are commonly used. However, due to complexity of

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Understanding LED performance: Evidence-based approaches to supporting stakeholders of energy-efficient lighting programmes

Gillian Isoardi, Steve Coyne Light Naturally, Brisbane, Australia Abstract The International Energy Agency’s Energy Efficient End-use Equipment, Solid State Lighting (IEA 4E SSL) Annex takes an evidence-based approach to evaluating LED product performance. Using comprehensive market data from product registries, surveys, market product testing and by initiating leading edge research, the SSL Annex provides support to governments looking to implement energy-efficient policies in lighting. Key to this activity, is the development of recommendations on parametric

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Detailed Characterisation for Smart Dynamic Lighting

C. Kofod; C. Dam-Hansen; A. Thorseth; D.D. Corell; A. Bay; and P. Reinholdt; Proceedings of 2023 IEEE Sustainable Smart Lighting World Conference & Expo. IEEE, 6 p. 10170576 Smart light is gaining ground with increased speed driven by the pursuit of enhanced comfort, to achieve energy efficiency by dimming and to mimic the natural rhythm of daylight. Currently, lighting sources are only characterized and measured at full load as regulations [1] only set requirements for this and for

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Measurement of temporal light modulation: improving calculation methods for stroboscopic effect visibility measure

Steve Coyne and Gillian Isoardi, Light Naturally, Brisbane, Australia The International Energy Agency (IEA) 4E Solid State Lighting Annex is conducting an Interlaboratory Comparison (IC 2022) focused on the measurement of temporal light modulation (TLM) from solid state lighting (SSL) products. IC 2022 will compare measured TLM waveform data and calculated short term flicker index (PstLM) in IEC TR 61547-1 [1] and stroboscopic effect visibility measure (SVM, MVS) in IEC TR 63158 [2] for both

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Smart Lighting – New Features Impacting Energy Consumption

Smart lamps and luminaires are common in today’s lighting market. Smart lighting provides an opportunity for the consumer to benefit from wireless control of lighting products, e.g. by dimming, colour tuning and scheduling. These functions can provide energy saving but they also require energy consumption to supply standby power and gateways.

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LED Product Lifetime Testing Report

A new report by the IEA 4E Solid State Lighting Annex provides a look across the body of literature on lifetime definitions for LEDs and LED products. The reports looks at failure mechanisms, accelerated life tests and test methods for estimating lifetime, and provides some recommendations. There is currently no agreement as to which test method can best estimate the lifetime of LED lighting products and the report thus addresses a key issue for regulators

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Interlaboratory Comparison for Goniophotometers (IC 2017)

The final report from the IEA 4E Solid State Lighting Annex’s 2017 Interlaboratory comparison (IC 2017). This comparison had 36 participating laboratories from 19 countries with a total of 42 goniophotometric instruments, the largest interlaboratory comparison of such equipment ever undertaken. This comparison investigated the level of agreement in measurements of SSL products by various types of goniophotometers including near-field type and source-rotating type, as well as mirror-type goniophotometers which are most commonly used.  IC

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Literature Summary of Lifetime Testing of Light Emitting Diodes and LED Products

A summary of the literature on lifetime definitions for LEDs and LED products, including a look at failure mechanisms, accelerated life tests and test methods for estimating lifetime, and provides some recommendations. There is currently no agreement as to which test method can best estimate the lifetime of LED lighting products and the report thus addresses a key issue for regulators and industry interested in deployment of LED technologies

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Lessons Learnt Bringing LEDs to Market

The purpose of this report is to provide policy makers with examples and a summary of how IEA 4E SSL Annex member countries’ have introduced and promoted LED illumination products in their respective markets. This report highlights key policy and

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Potential Health Issues of SSL

This report addresses the issues of the potential effects of solid state lighting (SSL) products on human health. This work mainly focuses on glare issues, photobiological effects caused by the optical radiation on the eye and skin, flickering phenomena non-visual effects of light

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