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Photobiomodulation : le pouvoir de la lumière LED sur la peau

Photobiomodulation: The Power of LED Light on Skin

Photobiomodulation is a practice adopted in both dermatology and aesthetic medicine. It is based on LED light. It is highly praised for its powers of regeneration,anti-acne, and antibacterial effects on the skin. Here's an overview of this practice, which can be performed in a professional setting or at home.

Photobiomodulation: What is it?

Having been in existence for over three decades, photobiomodulation is a method derived from phototherapy and inspired by laser technology. This technique utilizes LEDs.It can also be referred to by the term photomodulation.

The principle of photobiomodulation involves exposing the skin to non-ionizing artificial cold light of the LED type. Photobiomodulation utilizes different wavelengths of the visible spectrum and near infrared. This technique is painless and without side effects; it generates a deep stimulation of the skin cells.

Sharing similarities with plant photosynthesis, photobiomodulation is a biochemical reaction that light triggers at the level of skin cells. When these cells perceive light, the mitochondria they contain are stimulated and produce Adenosine Tri Phosphate or ATP. This substance is necessary for optimizing cellular renewal.

The various wavelengths used in photobiomodulation allow for targeting specific layers of the epidermis, dermis, and subcutaneous tissues. This method thus enables action on general cellular regeneration or more targeted skin issues such as acne.

Focus on the benefits of photobiomodulation.

Generally, photobiomodulation is a practice whose benefits are primarily focused on cell regeneration. When cellular renewal is optimal, the skin is oxygenated and hydrated. You may notice a restructuring and improvement of the skin surface. By increasing the sessions of exposure to different wavelengths, cell regeneration operates up to the deep skin layers.

Furthermore, photobiomodulation promotes the healing of skin lesions by stimulating collagen production. It also reduces the production of molecules responsible for inflammation. Photobiomodulation can be used to decrease oxidative stress, inflammation, and associated pain.

Various colors of light, corresponding to different wavelengths, can be used in photobiomodulation.

  • The blue light (wavelengths of about 470 nm) focuses on the epidermis. It is known for its benefits against acne and its bactericidal action. It also helps to calm inflammations.

  • The green light (wavelength of 527 nm) diminishes pigmented spots and evens out the skin tone.

  • The yellow light (wavelength of 590 nm) reduces redness and boosts healing. It penetrates to the dermis and can also be effective against alopecia due to its ability to stimulate microcirculation.

  • The orange light (wavelength of about 615 nm) is used to promote collagen production, enhance the action of fibroblasts, and treat stretch marks as well as alopecia.

  • The red light (wavelengths of about 640 nm) penetrates deeply into the dermis. It increases its ability to produce elastin and collagen fibers, which are essential for skin firmness. It plays a crucial role in skin tightening.

  • Invisible to the naked eye, the infrared light (wavelengths greater than 880 nm) affects the hydration level, inhibits lipogenesis, and activates the production of collagen and elastin. It can also be used to treat alopecia and certain stretch marks.

Are there any contraindications?

They are very rare. Only individuals with epilepsy and/or a history of skin cancer should refrain from using this practice if LEDs are used in pulsed light mode. Pregnant women can practice photobiomodulation, but with certain caution. As a precautionary measure, the eyes should be covered during a session.

Furthermore, all skin types are suitable and this procedure can be performed in any season. Exposure to the sun's UV rays is not prohibited during treatment.

It should be noted, a slight and fleeting sensation of warmth may be felt after a session. There is no cause for concern, simply use a good moisturizer a few hours later.


  • LEAH PRINZIVALLI AND REBECCA DANCER, What Is LED Light Therapy and How Can It Benefit Skin? Dermatologists break down everything you need to know about this high-tech treatment, (2022)


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