Calibration Services

A colorimeter is to measure the correlated color temperature (CCT) of a light source. Calibration is performed by comparing the colorimeter under test against the laboratory's reference colorimeters with calibration and measurement capability (CMC) is 20 K in the CCT range from 2750 K to 3200 K.

 

According to CIE 15:2018, correlated color temperature (CCT) is defined as the temperature of a Planckian radiator having the chromaticity nearest the chromaticity associated with the given spectral distribution on a diagram where the u', 2/3v' coordinates of the Planckian locus and the test stimulus are depicted. In other words, it is the temperature of the point on the blackbody locus on a CIE 1960 (u, v) chromaticity diagram nearest to the chromaticity coordinates of the light source under test.

The CCT of a light source under test is calibrated by comparing against the laboratory's reference standard lamps inside a 1.65-m diameter integrating sphere using a precision double monochromator. Measurement range is from 2700 K to 3100 K with CMC of 26 K.