Library

Welcome To The SSLC Library

AC power supply issue for intrinsic flicker performance measurement

These comments were prepared and submitted to Members of three Expert Working Groups investigating temporal light modulation: CIE TC 2-89, IEC TC34 WG5 and IES LM-90 WG.  These comments were intended to enable experts working on these committees to consider these preliminary findings on our on-going research into TLM measurements and certain AC power supplies used in test laboratories around the world.

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Improving the Mp metric for evaluation of Flicker

TLM (temporal light modulation) related measurements and calculations have become a focus with new regulations by European Commission and other regulatory authorities setting limits for TLA (temporal light artefacts) for LED lighting products. Generally, the regulations rely on PstLM (IEC TR 61547-1-2020) for flicker and SVM (TR 63158-2018) for stroboscopic effects.  Due to the complexity of PstLM, some attention is paid to another metric for flicker, Mp (ASSIST vol. 11, 2015).

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

The SSL Annex takes an evidence-based approach to evaluating LED product performance. Using comprehensive market data from product registries and other sources, the Annex developed recommendations on product performance and research into test methods that reduce the time and cost burden for government, industry and consumers.  This paper highlights several activities that exemplify this evidence-based approach and the outcomes of that work.

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Detailed Characterisation for Smart Dynamic Lighting

Smart lighting is gaining ground with increased speed driven by market demands for enhanced comfort, greater energy efficiency and simulating the the natural rhythm of daylight. But how do smart lighting sources perform when the light is dimmed, and when the colour temperature is changed? Is there a need for better characterisation? This paper presents some data from the Danish ELFORSK project ISGES which measured many smart lighting sources, including products from the professional and

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

The SSL Annex is conducting an Interlaboratory Comparison (IC 2022) on the measurement of temporal light modulation (TLM) from SSL products. In this context, uncertainty associated with SVM calculations must be minimised and remain consistent across a range of waveform measurement parameters (e.g., sampling frequency, duration) used in different systems. This presentation discusses two methods for improving accuracy and precision of determined values for SVM and their importance to IC 2022.

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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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