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In recent years, some merchants have claimed that LED red and blue light has improved the skin, and developed an LED beauty instrument. Users can calm their emotions and focus when using blue light to illuminate facial skin. Red light can be used for collagen proliferation and improvement. Small lines, pores, swelling after surgery.
the truth:
Different wavelengths of LED light can have different effects on the skin. However, because each person's skin condition is different, it is necessary to use the LED light of the appropriate wavelength to improve the skin, and the LED light does not have some functions such as stable mood and concentration.
“This product uses LED phototherapy to provide light energy in a similar way that plants absorb light energy from the sun. It emits beneficial light, activates cells, stimulates the body's natural processes, and promotes the regeneration of new proteins and cells.†This is a network. The discussion on the official website of the beauty equipment from the United States, although its appearance is similar to the supermarket scanner is very inconspicuous, but the price of up to thousands of dollars can still withstand the customer's consulting purchase. The reporter has a rough statistics in Taobao. This instrument has an average transaction every day, and the monthly sales of similar products in Taobao are in thousands. 
But at the same time, the reporter also saw in some skin care forums that there are countless posts asking about the effects of the instruments. Many “hands-on people†still have some doubts before buying, buying and buying, using red and blue light to illuminate the skin. Can it make the skin younger? Is it like some product propaganda written, blue light source can be used to calm emotions, focus attention; red light source can be used for collagen proliferation, improve small lines, pores, swelling after surgery and other functions?
The reporter contacted Wang Xiuli, deputy dean of the Department of Photomedicine, Shanghai Dermatology Hospital. She has used three different wavelengths of light-emitting diodes to study the effects of photoaging skin. Dean Wang told reporters that they chose 14 skin photoaging testers, and selected three areas on the side of each of their arms, which were given 530, 630 and 850 nm LED light, three times a week, for a total of 12 Times. After the end of the test, the irradiated parts were observed, and the water content of the stratum corneum of the skin before and after the irradiation, the change of the brightness of the skin color, and the shape, color and the influence of the collagen fibers and the elastic fibers in the dermal tissue were compared to judge the light aging of the LED light. The role of the skin.
The results show that different wavelengths of LED illumination have different effects on the skin. After 14 cases of 630 and 850 nm, the skin texture of the test was lightened and the pigmentation was reduced in 10 cases and 7 cases. After the test with 530 nm wavelength LED light, there were 7 cases. The skin texture of the subject was deepened and the pigmentation increased. In addition, after 630 and 850 nm illumination, the water content of the stratum corneum of all subjects was significantly increased. This shows that medical LEDs do have an effect on the skin.
However, it is worth noting that in the treatment of photoaging, it is necessary to select the LED light of the appropriate wavelength to achieve the best effect. As for the illumination wavelength of the online red and blue illumination instrument, it may not meet the requirements of everyone. "Our trial is only a small scope, and it is not representative. People who want to improve their skin condition still need to go to the hospital for a formal examination to get the right medicine." President Wang said.
Why does medical LED have an effect on the skin? Fan Wei, the chief physician of the Laser Beauty Center of the Beijing Military Region General Hospital, explained the principle behind it to the reporter. The biggest difference between medical LED light and ordinary LED is that its power and energy are larger. "In terms of red light, its wavelength is about 600 nanometers, and the power is about five or six hundred milliwatts. The average may only be dozens. Milliwatts.†There are many light sources on the light panel of medical LEDs, which combine the energy to achieve therapeutic effects.
The different wavelengths of light lead to different colors. Medically, more than 400 nanometers to more than 600 nanometers of light, and more than 400 nanometers of blue light have the effect of bactericidal and anti-inflammatory. This is because the bacteria on the skin absorb light of this wavelength. Decomposes to kill fungi and normalize sebum secretion. The main effect of red light of more than 600 nanometers is to promote blood circulation and phlegm. This is because red light can accelerate microcirculation, increase capillary permeability, accelerate metabolism, and repair damaged capillaries. However, there are no scientific evidence for the claims that the blue light that can be used by the manufacturers of beauty equipment can stabilize the mood. "The most scientific method is to go to the dermatology specialist in a regular hospital to check, the right medicine."
A skin care person who used red and blue beauty told reporters that she started a beauty instrument because of the problem of acne. "The skin did improve after a few days of irradiation." The anti-inflammatory phenomenon has eased, but she insisted. It didn't take long for it to be used up - "Like many skin care products on the market, it worked very well at first, but it was not obvious later." At the same time, she did not forget to explain to reporters, "Skin care products are all It varies from person to person, and some products that are well-used on the Internet may not be suitable for you." 
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