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Light at night lights commonly used light source, light like the sun brought the light to the people.

On the nature of light, Maxwell proposed the theory of electromagnetic waves in the history. In the electromagnetic wave, the electromagnetic wave with wavelength of 380 ~ 780nm can be generated by people's eyes, and this part of the electromagnetic wave is visible light. Wavelength from 380nm to 780nm increased, the color of the light purple, blue, green, yellow, red sequence. Light color and color table including two color display. Color table is the color of light source, that is, from the appearance of the color of light; color rendering is refers to the light source lighting, a variety of color in the visual distortion level, usually with color rendering index. When the light source is the same as the reference light source, the color value is 100, the color difference is smaller.

When the city lights use high-pressure mercury lamp illumination, if viewed from afar, people will feel its light is bright white. But it is to see the irradiation face, like a face with a layer of graphite, and feel not satisfied. Because the line is missing in the blue and green lamp. Especially red. So it looks uncomfortable. This shows that the high pressure mercury lamp color table is good, light white and bright, but the color is not good. The incandescent lamp light source and the mercury light source opposite. It looks like the lamp is not good, but the color of the object is very little distortion. Good color for incandescent lamp. Sodium lamp light color is yellow, when put in a blue cloth in sodium light blue cloth into the cloth. Description of the sodium lamp color and color are not good. From these examples, we can see that the color table of the light source is different from that of color.