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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Luminance responsivity. Luminance meter. Measurand unit, A/(cd m-2), V/(cd m-2), reading/(cd m-2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.5
Reference lamp / diffuser combination
Luminance: 1E-04 cd/m2 to 1 cd/m2
Type of source used: tungsten reference lamp / diffuser combination
 
Luminance responsivity. Luminance meter. Measurand unit, A/(cd m-2), V/(cd m-2), reading/(cd m-2)
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 1.0
Reference lamp / diffuser combination
Luminance: 1 cd/m2 to 20000 cd/m2
Type of source used: tungsten reference lamp / diffuser combination
Other types of source can also be used