Sunlight is the best light source is an axiological understanding. In addition to meeting the demands of visual lighting, the sun is also satisfied with the needs of physiological non-visual lighting. Human physiology research in physiological lighting has been greatly developed in recent decades, knowing that many reversible or irreversible chronic diseases of modern human are related to long-term unhealthy artificial lighting. The artificial light source so far has a large lack of spectra compared with sunlight, such as lack of spectra conducive to physiological rhythm, which is closely related to wake up, independent nervous system, gangliocytes.