The light-emitting principle of the commonly used LED is to use blue light chip, coated with yellow phosphor. There is a large energy of blue light (wavelength 460-465nm), excited phosphor emitted yellow light (main wavelength 530-555nm), these two colors in accordance with the principle of light mixing color to produce white light. I explain this to say that, yes, white leds contain blue wavelengths, but white light is not pure light, the sun's white light can reflect seven colors, the rainbow is this principle. In fact, most of the white light sources we use are a mixture of multiple wavelengths, and among them, the larger energy is blue light and violet light with a shorter wavelength than blue light.
Blue light is prevalent in white light sources, and it is unreasonable to have blue light pollution in transition rendering leds. Articles accusing LED blue light pollution often give examples if the eyes stare at the blue chip will damage the retina, but we use CFL energy-saving lamps, including sunlight, and even thermal incandescent lamps contain blue light, if the continuous staring, it will also cause damage to vision. So I want to say that LED white light does contain blue wavelength light, but as a lighting source he will not cause special damage to the human eye.
On the contrary, when consumers buy, it is necessary to buy LED lights from regular manufacturers to avoid quality problems caused by poor design and process that affect your normal use experience of LED lamps.
The principle of LED multicolor scintillation chip is to achieve the effect of multicolor scintillation by controlling the flashing frequency and brightness of different colors of LED lights. The chip is integrated with a control circuit and a number of LED lights. Through the adjustment of the control circuit, the LED lights of different colors flash alternately, resulting in a rich and colorful flashing effect. At the same time, LED chips have the advantages of low power consumption and long life, and are widely used in indoor and outdoor decoration, billboards, festival celebrations and other occasions.