Light during the night lights commonly employed light source, light just like the sun brought the light to the people.

On the nature of light, Maxwell proposed the concept of electromagnetic waves during the background. During the electromagnetic wave, the electromagnetic wave with wavelength of 380 ~ 780nm may be generated by people’s eyes, and this a part of the electromagnetic wave is noticeable light. Wavelength from 380nm to 780nm increased, the color with the light purple, blue, green, yellow, red sequence. Light shade and colour table which includes two shade show. Color table will be the color of light source, that may be, from the physical appearance in the colour of light; colour rendering is refers towards the light supply lighting, a variety of color inside the visual distortion degree, usually with color rendering index. Once the light supply could be the exact same as the reference light supply, the color worth is 100, the shade difference is smaller sized.

Once the city lights use high-pressure mercury lamp illumination, if viewed from afar, folks will feel its light is brilliant white. But it is always to see the irradiation face, like a encounter having a layer of graphite, and really feel not happy. Because the line is missing inside the blue and green lamp. In particular red. So it looks unpleasant. This displays that the large strain mercury lamp colour table is excellent, light white and vivid, but the color will not be good. The incandescent lamp light source and also the mercury light source opposite. It looks such as the lamp isn’t superior, however the shade with the object is extremely very little distortion. Good shade for incandescent lamp. Sodium lamp light colour is yellow, when put in a blue cloth in sodium light blue cloth into the cloth. Description on the sodium lamp shade and color are certainly not great. From these examples, we can see that the color table from the light source is diverse from that of colour.