1. The visible light color principle Visible spectrum of the wavelength range for 380 nm to 760 nm, is the human eye can feel QiSeGuang-red, orange, yellow, green, green, blue, violet, but the seven color of light all respectively is a monochromatic radiations. In visible spectrum is not the spectrum, because white light is not monochromatic components, but by a variety of monochromatic components of the synthesis composite light, just as the light from the sun is by seven monochromatic light spectrum of synthesis, and the color TV spectrum also by the three colors red, green, and blue synthesis. 2. LED light color principle Can't be directly LED a white light, to make a LED the white light, the spectral characteristics it should include the whole of the visible spectrum. According to the research of visible light people, people can see the white light of the eyes, at least two kinds of light to mix, namely two wavelength light (blue light + yellow light) or three wavelength light (blue light + green light + red light) mode. The above two modes are need to blue light, so the blue light has become intake of the key technology manufacturing white light