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 United Kingdom, NPL (National Physical Laboratory)    Complete CMCs in Photometry and Radiometry for United Kingdom (.PDF file)
  
Radiance factor. General material, 0.25 % to 300000 %   Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0034R)   Reference reflectometer   Wavelength range: 350 nm to 400 nm   Bandwidth: 10 nm to 20 nm   Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material Approved on 07 May 2007 
 Radiance factor. General material, 0.1 % to 300000 %   Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.01% + 0.0019R)   Reference reflectometer   Wavelength range: 400 nm to 1000 nm   Bandwidth: 10 nm to 20 nm   Uncertainty values are for 0/45 geometry and white Spectralon. Uncertainty varies with scattering geometry and angular dependence of scattering properties of material Approved on 07 May 2007 
 Wavelength. Spectrallyselective transmitting material, 200 nm to 2500 nm   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 0.1   Scanning spectrophotometer   Wavelength range: 200 nm to 2500 nm   Bandwidth: 0.1 nm to 5 nm   Approved on 07 May 2007 
 Wavenumber. Spectrallyselective transmitting material, 1028 cm^{1} to 3060 cm^{1}   Absolute expanded uncertainty (k = 2, level of confidence 95%) in cm^{1}: 0.2 to 0.3 (depending on wavenumber)   Scanning spectrophotometer   Wavenumber values: 3060 cm^{1}, 2850 cm^{1}, 1943 cm^{1}, 1601 cm^{1}, 1583 cm^{1}, 1154 cm^{1}, 1028 cm^{1}   Bandwidth: 2 cm^{1} to 10 cm^{1}   Approved on 07 May 2007 
 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 
 Correlated colour temperature response. Colour temperature meter. Measurand unit, reading/K   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in K: 10   Tungsten reference lamps   Correlated colour temperature: 2000 K to 3200 K   Calibrations can also be carried out at correlated colour temperatures used for visual displays e.g. 6500 K (uncertainty associated such calibrations is higher and depends on the source used) Approved on 20 April 2017 
 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 
 Colour, emitted, u, v. General source. u, v, 0 to 0.9   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0004   Spectroradiometer and reference lamps   Bandwidth: < 20 nm   Type of source: any source, including displays   Uncertainty varies according to source properties. Results can also be expressed in other units e.g. x, y or Lab. Approved on 07 May 2007 
 Colour, emitted, u, v. General source. u, v, 0 to 0.9   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0001   Spectroradiometer and reference lamps   Bandwidth: selected to suit source type   Type of source: any source, including displays   Uncertainty varies according to source properties. Results can also be expressed in other units e.g. x, y or Lab. Approved on 07 May 2007 
 Colour, emitted, uprime, vprime. General source, 0 to 0.9   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0004   Spectroradiometer and reference lamps   Bandwidth: < 20 nm   Type of source: any source, including displays   Uncertainty varies according to source properties. Results can also be expressed in other units e.g. x, y or Lab. Approved on 07 May 2007 
 Colour, emitted, uprime, vprime. General source, 0 to 0.9   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0001   Spectroradiometer and reference lamps   Bandwidth: selected to suit source type   Type of source: any source, including displays   Uncertainty varies according to source properties. Results can also be expressed in other units e.g. x, y or Lab. Approved on 07 May 2007 
 Colour, surface, x, y, Y. General material, x, y = 0 to x, y = 0.9   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0002   Integrating sphere spectrophotometer   Specific measurement conditions: 0/d, 2 nm bandwidth   Type of material: nonfluorescent   Approved on 07 May 2007 
 Colour, surface, x, y, Y. General material, Y = 0 to Y = 1   Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.0005 + 0.0035Y)   Integrating sphere spectrophotometer   Specific measurement conditions: 0/d, 2 nm bandwidth   Type of material: nonfluorescent   Approved on 07 May 2007 
 Colour, surface, x, y, Y. Fluorescent material, x, y = 0 to x, y = 0.9   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003   Reference spectrofluorimeter   Type of source used: monochromator   Specific measurement conditions: 0/45   Type of fluorescent material: general   Approved on 07 May 2007 
 Colour, surface, x, y, Y. Fluorescent material, Y = 0 to Y = 300   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003   Reference spectrofluorimeter   Type of source used: monochromator   Specific measurement conditions: 0/45   Type of fluorescent material: general   Approved on 07 May 2007 
 Colour, surface, x, y, Y. Diffusely reflecting material, x, y = 0 to x, y = 0.9   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.0002   Integrating sphere spectrophotometer   Specific measurement conditions: 0/d, 2 nm bandwidth   Other types of material can also be calibrated Approved on 07 May 2007 
 Colour, surface, x, y, Y. Diffusely reflecting material, Y = 0 to Y = 1   Absolute expanded uncertainty (k = 2, level of confidence 95 %): (0.0005 + 0.0035Y)   Integrating sphere spectrophotometer   Specific measurement conditions: 0/d, 2 nm bandwidth   Other types of material can also be calibrated Approved on 07 May 2007 
 Colour, surface, L*a*b*. General material, L* = 0 to L* = 100   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.15   Integrating sphere spectrophotometer   Specific measurement conditions: 0/d, 2 nm bandwidth   Type of material: nonfluorescent   Approved on 07 May 2007 
 Colour, surface, L*a*b*. General material, a*, b* = 200 to a*, b* = 200   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.1   Integrating sphere spectrophotometer   Specific measurement conditions: 0/d, 2 nm bandwidth   Type of material: nonfluorescent   Approved on 07 May 2007 
 Colour, surface, L*a*b*. Fluorescent material, L* = 0 to L* = 160   Absolute expanded uncertainty (k = 2, level of confidence 95 %): 0.003   Reference spectrofluorimeter   Irradiation conditions: monochromator   Specific measurement conditions: 0/45   Type of fluorescent material: general   Approved on 07 May 2007 
