– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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International Commission on Illumination (CIE)

The International Commission on Illumination (CIE) is devoted to world-wide cooperation and the exchange of information on all matters relating to the science and art of light and lighting, colour and vision, photobiology and image technology.

An Agreement between the CIPM and the CIE was signed in 2007. This Agreement recognizes the responsibility of the CIPM for the definition of the photometric units in the SI and the responsibility of the CIE for the standardization of the action spectra of the human eye. These two interlinked cornerstones form the foundations of practical physical photometry world-wide. The Agreement states that the two organizations will act in close cooperation in matters of common interest.

Formal relationship:
Links between the BIPM and the CIE:

  • The BIPM and the CIE cooperate to ensure that data related to measurements of light, optical radiation, colour, optical properties of materials, and photobiological and photochemical quantities are based on units traceable to the International System of Units (SI).
  • CIE participates in the CCU and the CCPR.
  • CIE JTC-2 Joint CCPR/CIE Task Group on "Principles Governing Photometry" has been established under the auspices of the CCPR Working Group on Strategic Planning (WG-SP). This Task Group is chaired by Dr Yoshi Ohno (NIST).

BIPM contact(s):