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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Luminance. Tungsten-based source, 1 cd/m2 to 20000 cd/m2
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.0
Telephotometer and reference lamp / calibrated diffuser combination
Correlated colour temperature: 2700 K to 3200 K