A new Memorandum of Understanding (MoU) between the International Commission on Illumination (CIE) and the International Bureau of Weights and Measures (BIPM) was signed on 15 July 2025 in Varenna, Italy. The agreement continues and strengthens the long-standing collaboration between the two organisations in support of global comparability and standardization in optical measurements, including photometry, radiometry, and digital metrology.
Signed by Dr. Diana Wernisch, Secretary General of the CIE, and Dr. Martin Milton, Director of the BIPM, the new MoU replaces the previous agreement signed in 2007 between CIE and the International Committee for Weights and Measures (CIPM). It formalises and updates the cooperation between CIE and BIPM, reflecting current and emerging needs of the international measurement community.
The BIPM and CIE have sustained a longstanding and productive collaboration through their work with the Consultative Committee for Photometry and Radiometry (CCPR), established in 1933, and the Consultative Committee on Units (CCU), established in 1964.
The signed MoU can be accessed here.