A calibration method for a filter colour measuring device with at least three colour channels that has the following: providing a target light source (Mc) to be measured, a filter colour measuring device, and a computer (C ext), wherein the filter colour measuring device is connected to the computer (C ext), wherein the at least three colour channels each comprise a colour filter with different spectral transmittance, wherein a calibration matrix is formed for transforming output signals (C 1...C n) of the colour channels into tristimulus colour values (X, Y, Z), wherein the calibration is done digitally and spectrally, the spectral sensitivities of the colour channels of the colour measuring device are measured and stored, wherein the spectral sensitivities are the ratios of the measured values measured with the colour measuring device and a reference spectrophotometer (SPMref) for the same wavelength in each case, an emission spectrum of a target light source is measured and stored with the reference spectrophotometer (SPMref), and this emission spectrum is included in the calculation of the calibration matrix, the calibration matrix is calculated from the spectral sensitivities and the spectral evaluation functions of a standard observer, preferably a standard observer according to CIE 1931, and the calibration matrix is calculated by solving the matrix equation P * S * CM = P * CMF according to the elements of the calibration matrix, where P is a matrix the elements of which are the individual spectral values of the emission spectra of the target light source for at least three different colours of same, where S is a matrix the elements of which are the individual spectral values of the spectral sensitivities of the colour channels of the colour measuring device, and where CMF is a matrix the elements of which are the individual spectral values of the spectral evaluation functions of the standard observer, preferably the standard observer according to CIE 1931, and the emission spectra of a plurality of target light sources are measured with the reference spectrophotometer (SPMref) and stored in a database in association with model and/or type information of the target light sources, characterized in that the computer (Cext) itself identifies the target light source (Mc) to be measured, so that an emission spectrum corresponding to the model or type of the specific target light source (Mc) is selected from the database by the computer (Cext) and used for the calculation of the calibration matrix. providing a target light source (Mc) to be measured, a filter colour measuring device, and a computer (C ext), wherein the filter colour measuring device is connected to the computer (C ext), wherein the at least three colour channels each comprise a colour filter with different spectral transmittance, wherein a calibration matrix is formed for transforming output signals (C 1...C n) of the colour channels into tristimulus colour values (X, Y, Z), wherein the calibration is done digitally and spectrally, the spectral sensitivities of the colour channels of the colour measuring device are measured and stored, wherein the spectral sensitivities are the ratios of the measured values measured with the colour measuring device and a reference spectrophotometer (SPMref) for the same wavelength in each case, an emission spectrum of a target light source is measured and stored with the reference spectrophotometer (SPMref), and this emission spectrum is included in the calculation of the calibration matrix, the calibration matrix is calculated from the spectral sensitivities and the spectral evaluation functions of a standard observer, preferably a standard observer according to CIE 1931, and the calibration matrix is calculated by solving the matrix equation P * S * CM = P * CMF according to the elements of the calibration matrix, where P is a matrix the elements of which are the individual spectral values of the emission spectra of the target light source for at least three different colours of same, where S is a matrix the elements of which are the individual spectral values of the spectral sensitivities of the colour channels of the colour measuring device, and where CMF is a matrix the elements of which are the individual spectral values of the spectral evaluation functions of the standard observer, preferably the standard observer according to CIE 1931, and the emission spectra of a plurality of target light sources are measured with the reference spectrophotometer (SPMref) and stored in a database in association with model and/or type information of the target light sources, characterized in that the computer (Cext) itself identifies the target light source (Mc) to be measured, so that an emission spectrum corresponding to the model or type of the specific target light source (Mc) is selected from the database by the computer (Cext) and used for the calculation of the calibration matrix.