News Company News Chinese Laboratories and Experts Recognized in IEA International Interlaboratory Comparison on Lighting Flicker Measurement and Received Special Acknowledgment 
Release time：2025-09-29
On September 23, 2025, the Smart Sustainability in Lighting and Controls (SSLC) Platform under the International Energy Agency (IEA) 4E Programme released the IC 2023 Nucleus Laboratory Comparison Report, Part 2: TLM Generator Artefact, announcing the results of an international interlaboratory comparison on the measurement of Temporal Light Modulation (TLM) generators. The report’s title page extends special acknowledgment to Professor Pan Jiangen, Chairman of Hangzhou Everfine Photo-E-Info Co., Ltd. (EVERFINE), and to the National Lighting Test Centre (NLTC) in Beijing for their valuable contributions.
Launched in 2023, the IEA’s IC 2023 Interlaboratory Comparison focused on TLM measurements for solid-state lighting (SSL) products, with the goal of verifying global consistency in flicker metric measurements. Building on the IEA’s legacy of successful lighting measurement comparisons, this initiative follows the landmark IC 2013 and IC 2017 programmes—the world’s largest interlaboratory comparisons for SSL photometric, colorimetric, electrical, and goniophotometer measurements.
To enhance global applicability, IC 2023 was closely aligned with two concurrent regional comparison projects: the European Innovation & Research Metrology Programme (EMPIR) Metrology for Temporal Light Modulation (MetTLM) project and the China National Standard Verification Programme: Temporal Light Modulation Interlaboratory Comparison (China GBV-LC TLM). Both regional efforts shared identical test artefacts, ensuring cross-regional alignment. The diagram below illustrates the structure of IC 2023, which consists of a nucleus laboratory comparison (red circle), main rounds (black circles) and two associated regional comparisons (blue and purple circles).
Prior to the main measurement rounds, a Nucleus Laboratory Comparison (NLC) was conducted among five leading global laboratories. Its objectives were to validate measurement consistency, establish reference values for the test artefacts, and ensure traceability for participating laboratories. NLTC Beijing and EVERFINE were selected as the only Chinese representatives to join this core-level comparison.
In November 2024, the “IC 2023 Nucleus Laboratory Comparison Report, Part 1: Lamp Artefacts” was published, presenting the comparison results of four LED lamp artefacts among the nucleus laboratories. The newly released Part 2 of the report focuses on flicker measurements for a TLM generator artefact. According to the measurement comparison results from both reports, Chinese laboratories achieved outstanding results that show good consistency with the international reference values for the core flicker metrics evaluated, earning recognition from international peers.
Released in November 2024, IC 2023 Part 1 presented results for four LED lamp artefacts. The newly published Part 2 focuses on flicker performance of TLM generators. Across both reports, Chinese laboratories achieved outstanding consistency with international reference values on all core flicker metrics, earning high recognition from the global expert community.
For full details, visit:
https://www.iea-4e.org/news/ssl/ic-2023-nucleus-lab-comparison-report-part-2-published/
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