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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
Colour, emitted, x, y. General source, 0 to 0.9
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0008 to 0.0001, varies with measurand
Spectroradiometer and reference lamps
Bandwidth: < 20 nm
Type of source: any source, including displays
The uncertainty varies according to the source properties; the quoted uncertainty applies for tungsten sources. Results can also be expressed in other units e.g. u, v or Lab