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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Correlated colour temperature. Tungsten lamp, 2000 K to 3200 K
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in K: 10
Reference lamps and spectroradiometer
Other types of source can also be calibrated at higher uncertainty levels (uncertainty depends on the spectral characteristics of the source) Approved on 20 April 2017