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Adjustment of the photometric standards maintained at the BIPM

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LETTER TO THE EDITOR

The photometric standards for luminous intensity and luminous flux held at the Bureau International des Poids et Mesures (BIPM) consist of two groups of lamps. The values ascribed to these standards are derived from the mean values of the most recent international comparisons of national photometric standards. Following the recent key comparisons organized under the auspices of the Consultative Committee for Photometry and Radiometry (CCPR), CCPR-K3.a for luminous intensity and CCPR-K4 for luminous flux, the International Committee for Weights and Measures (CIPM) decided in 2001 that the values ascribed to the BIPM standards should be adjusted to bring them into agreement with the reference values of these comparisons.


PACS

07.60.Dq Photometers, radiometers, and colorimeters

42.72.-g Optical sources and standards

06.20.F- Units and standards

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 1 (February 2002)



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