The deuterium light source launched by Changchun New Industry, model D-Light, has a continuous spectral output range from 185nm to 700nm. Therefore, the D-Light deuterium light source can be used as a reference light source for absorbance, transmittance and reflectance measurements, and can also be applied to high-precision analytical measurement instruments such as liquid chromatographs. When using a deuterium light source, it is advisable to use anti-ultraviolet quartz optical fibers in combination. Since quartz also has absorption at wavelengths below 300nm, anti-ultraviolet optical fibers are required to achieve the best effect when using wavelengths below 300nm.