Welcome To The SSLC Library
Analysis of PstLM and stroboscopic visibility measure variations due to different measurement conditions
Temporal Light Artifacts (TLAs) are undesired visual perceptual effects, caused by Temporal Light Modulations (TLMs), which commonly exist in lighting systems, especially LED lighting systems. Accurate measurement of TLM and evaluation of TLA metrics, specifically the stroboscopic visibility measure (SVM) and the short-term flicker indicator (PstLM), are required by certain product safety regulations with limit values specified.
Securing Additional Energy Savings in SSL: an International Lighting Technology Roadmap
Over the past 20 years, the development and adoption of-state lighting (SSL) has led to substantial improvements in the quality and efficiency of lighting. This disruptive technology enabled a decoupling of lighting and energy consumption, whereby delivered lumens of light around the world has increased while lighting-related energy consumption and greenhouse gas emissions have decreased.
Interlaboratory Comparison for Temporal Light Modulation Measurement
The 4E SSLC Platform has conducted an Interlaboratory Comparison (IC 2023) for the measurement of temporal light modulation (TLM) of solid-state lighting (SSL) products. Designed to meet proficiency testing requirements, IC 2023 compared measured TLM quantities of short-term flicker indicator (PstLM) and stroboscopic effect visibility measure (SVM, MVS), as well as three other TLM quantities, of four comparison LED lamp artefacts.
Influence of AC power supply on light flicker measurements
Accurate measurement of the short term flicker indicator is important for avoiding visible flicker and for SSL products compliance with regulations. The IC2023 Interlaboratory Comparison of temporal light modulation measurements revealed large variations depending on the laboratory-grade AC power supplies used.
Solid-State Lighting: Health Effects and Knowledge Gaps
The health effects of LED lamps and luminaires used for general lighting were reviewed by an international team of researchers working under the 4E SSLC Platform.
IC 2023 Nucleus Laboratory Comparison Report Part 1: Lamp Artefacts
This report presents a comparison and demonstration of measurement equivalency of the five Nucleus laboratories that constitute the core of Interlaboratory Comparison 2023 (IC2023). This report is Part 1, covering LED lamp artefacts used in IC 2023.
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.
IEA 4E Smart Sustainability in Lighting and Controls (SSLC) Platform: A New Term Focused on Smart Lighting Systems, 2024 to 2029
IEA 4E Smart Sustainability in Lighting and Controls (SSLC) Platform: A New Term Focused on Smart Lighting Systems, 2024 to 2029.
Solid State Lighting: Review of Health Effects
This report offers a comprehensive review of the scientific knowledge acquired in the course of the last ten years on the effects of solid state light on human health.
SSLC Platform Overview for BRICS-ISA Conference in Shenzhen, China
IEA 4E Smart Sustainability in Lighting and Controls (SSLC) Platform: A New Term Focused on Smart Lighting Systems, 2024 to 2029 Michael Scholand, L.C., Deputy Manager (presenting) Prof. Georges Zissis, Chair, Management Committee Peter Bennich, Ph.D., Deputy Chair, Management Committee Nils Borg, Manager 18 July 2024 BRICS Smart Lighting Industry Summit, Shenzhen, China
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).
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.
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
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.
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.
SSL Quality and Performance Requirements
The 4E SSL Annex has published its new and updated “quality and performance requirements” for the most popular LED lamps and luminaires.
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
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
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
Quality and Performance Requirements for LED Lighting Products – Public review Draft
Public review draft of the updated Quality and Performance Requirements for LED Lighting Products released 25 November 2020, for comment by 25 January 2021.
