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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Illuminance. Tungsten lamp, 0.1 lx to 50000 lx
Relative expanded uncertainty (k = 2, level of confidence 95 %) in %: 0.5
Photometric bench and reference lamps / photometer
Correlated colour temperature: 2000 K to 3200 K