Precise micro-spectrometer technology is used to detect LED light source and is able to show light composition and intensity, and correlation detection values of the LED light source (CCT, CRI, CIE1931 color coordinates diagram, spectrogram and purity etc.). Comparing with a regular LED measurement device, the instrument has a higher cost-performance ratio and serviceability, light source measurement can be taken in various environments, not only the spectrum deviation is kept within the range of ± 0.8nm, the detection stability also falls within the standard of four ten thousandths.