The XYL-VI Luminance Photoelectric Colorimeter changes the traditional structure thoroughly, employs thesensors to replace the traditional analogue sensors, employs the digital signal measurement system to replace the traditional analogue measurement system. The instrument has no analogue unit, thus it is very simple to overcome the zero drift that is impossible to be avoided in traditional colorimeter. The digital sensor has a large dynamic range. Moreover, it possesses strong anti-interference ability and it has high accuracy.