Metrology for Temporal Light Modulation 20NRM01

Metrology for Temporal Light Modulation

A Joint Research Project within the European Metrology Programme for Innovation and Research


LED-based lighting contributes to energy saving and the reduction of the environmental impact of lighting. However, LED lamps can show fluctuations in the light output known as temporal light modulation (TLM) which could, above certain limits and under certain conditions, impact the health, well-being and safety of people. The new EU Ecodesign 2019/2020 ‘Single Lighting Regulation’ sets limitations on TLM.

The overall aim of this project is to create the metrology infrastructure for the measurement of TLM in LED lighting and the visual effects induced by TLM, known as temporal light artefacts (TLAs). This project will develop and validate measurement methods for quantitative measurement of TLAs, such as flicker and the stroboscopic effect, and it will advance the development of a metric for the phantom array effect.

The project results will underpin the development of standardisation on TLM and will provide the lighting industry, instrument manufacturers and market surveillance authorities with undisputable results of their TLM measurements.


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9-10 November 2022

18-month meeting of the project consortium.

20 April 2022

Publishable summary and project results updated on the website.

1-2 February 2022

9-Month meeting of the project consortium.

28 September 2021

CIE 2021 Midterm Meeting & Conference has a session devoted to temporal light modulation, with two presentations from the project.

25 June 2021

Website for MetTLM goes online.

17 May 2021

Kick-off meeting for the Joint Research Project.