We can not only see the visible radiation, but can feel it with color. A single component color with the wavelength of visible radiation. Near the 380 - nm wavelength radiation purple, near 780 nm radiation is dark red. Color along with the change of wavelength, there is no clear dividing line between different color, the color is gradient transition. Visible radiation make people not only have the feeling of light and color, and different colors of visible radiation has a certain psychological effect. Red makes a person feel happy, warm, warm; Purple blue light make a person feel cold and stillness; Light green light to make people feel pure and fresh, lively. Commonly used in lighting engineering, therefore, various color beam construction environment, foil atmosphere. Also use the color of light to treat a variety of psychological and physiological diseases. YanZhiXiang
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