LEDs are cold light sources that act through non-thermal effects known as «photobiomodulation» at the level of cells. They deliver narrow bands of light from the «visible» and infrared spectrum of the sun: blue, purple, green, yellow, orange, red or infrared depending on the wavelength. Each color has effects on certain types of cells, the dose used is also important. the main indications available are: - Progressive inflammatory acne (endogenous dynamic phototherapy) - Photo-protection: prevention of sunburn, pathologies with photosensitivity (lucites) - Prevention and treatment of mucositis and radiodermatitis - Healing: delayed healing, colonized wounds, perforating plantar ailments - Reactive skin prone to redness and rosacea (rosacea) resistant - Skin attacked in particular to reduce the consequences of aggressive treatments (laser, peeling, etc.) - Improvement of skin texture: aging, scars and stretch marks - Skin diseases: vitiligo, psoriasis, atopic dermatitis - Hair loss - Cellulitis - And maybe melasma (pregnancy mask)