Scandium metal can be used to make scandium sodium lamps, which can bring light to thousands of households. This is a metal halide light source: sodium iodide and scandium iodide are filled into a light bulb, and scandium and sodium foil are added at the same time. During high-voltage discharge, scandium ions and sodium ions emit light of their characteristic emission wavelengths, respectively. The spectral lines of sodium are two famous yellow rays, 589.0 nm and 589.6 nm, while the spectral lines of scandium are a series of near ultraviolet and blue light emitted at 361.3~424.7 nm. As they complement each other, the overall color produced is white light. It is precisely because scandium sodium lamps have the characteristics of high luminous efficiency, good light color, energy-saving, long service life, and strong ability to break fog that they can be widely used in television cameras, squares, sports venues, and road lighting, and are known as the third-generation light source.