D65 and D75 standard light source and method for compensating chrominance drift thereof

The invention relates to a D65 and D75 standard light source and a method for compensating the chrominance drift thereof. The D65 and D75 standard light source comprises at least one LED white-light illuminant and at least one blue-light LED light-emitting element. The light of the LED white-light illuminant and the light of the blue-light LED light-emitting element are mixed to form the D65 and D75 standard light source. Each of the LED white-light illuminant and the blue-light LED light-emitting element is driven by a respective independent power supply. The D65 and D75 standard light source is also provided with color temperature sensors, a comparison circuit, and a power control circuit. The LED white-light illuminant and the blue-light LED light-emitting element are connected with respective color temperature sensors. The color temperature sensors are connected with the comparison circuit. The comparison circuit is further connected with the power control circuit of the blue-light LED light-emitting element. The light-emitting stability of the D65 and D75 standard light source is effectively maintained. During a rated effective service life, the method may effectively compensate the chrominance drift of the D65 and D75 standard light source.