A lecture on application of light modulation in skin beauty by LEI HONG XIANG


Hongxiang Lei, chief physician, doctor of medicine, professor, doctoral supervisor. The current deputy director of the Department of Dermatology of Huashan Hospital, the executive deputy director of the Institute of Dermatology of Fudan University, the National Committee of the Chinese Society of Dermatology and Venereology, etc.

Today we invite director Xiang Leihong to explain to us application of light modulation in skin beauty,The following is the main content of her lecture:

Light modulation is the use of lasers, light-emitting semiconductors or other light sources to adjust cell activity through non-photothermal effects, called light modulation.

LED biological light modulating effect as a new non-thermal light therapy applied to skin disease treatment early research in this field was mainly carried out by the National Aeronautics and Space Administration (NASA). NASA studies have found that specific wavelengths of light can promote plant growth. Due to the low wound healing ability of astronauts in zero-gravity space conditions and seals in submarine high pressure, NASA researched the use of LED phototherapy to promote wound healing and achieved positive results. This research is constantly being continued and innovated, and now powerful LEDs are used for various purposes from beauty to skin cancer treatment (as a light source for photodynamic therapy).

The difference between LED and laserhair growth

The mechanism of LED light modulation


The light modulation effect must have a minimum irradiation time for each course of treatment. It takes about a few minutes instead of a few seconds to activate the cell tissue. Otherwise, the tissue response will be too short to achieve the desired effect. The ideal treatment time must be adjusted according to the skin condition or the degree of inflammation during treatment. Continuous pulse mode can better promote collagen synthesis than continuous luminescence mode.

Application of LED light modulation in dermatology:

  • LED585nm treatment of chloasma

Skin rejuvenation

  • Skin rejuvenation

    In a randomized double-blind prospective placebo-controlled clinical study, 76 cases of skin aging patients were divided into 4 groups, and the hemifacial part received 83onm and/or 633nm LED treatment, and the treatment cycle was twice a week for a total of four weeks. The results showed that clinically, wrinkles were significantly reduced and skin elasticity increased. Histologically, collagen and elastic fibers increased significantly.

    hair growth

  • Anti-inflammatory effect

    Erythema reactions often occur after exfoliative or non-exfoliative laser surgery, and the application of light modulation can reduce this inflammatory reaction.

    Studies have found that the combination of non-thermal LED and non-exfoliative laser treatment of photoaging can not only produce synergistic effects, but also reduce the erythema reaction after laser surgery through the anti-inflammatory effect of LED


  • Promote wound healing

    In a clinical trial conducted by Trelles and Allone, 10 patients undergoing eyelid surgery and exfoliative laser surgery were given 633nm red light treatment (20 minutes, 96J/cm2). The results showed that the wound healing time on the red light treatment side was shortened, and erythema and edema Lighter than the non-red light side.

  • Promote hair growth

    In a clinical trial, 28 males and 7 females androgen-induced alopecia were treated with low-intensity laser irradiation for 6 months. The results showed that both the number of hairs and the tensile strength of male and female patients increased, with the male top area having the most significant effect

Skin rejuvenation

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