Basic knowledge of red light therapy:
1. 600-1200nm is the first treatment window of light on the skin
2. The absorption peak of hemoglobin is 415nm.540nm.580nm. So the penetration depth of 430nm ---1200nm light to the skin is basically proportional to the wavelength,3. Short wavelength less than 480 has a tanning effect,
4. A peak absorption of vascular diseases at 540 and 580, 530 for superficial and small blood vessels, 560 for thick and large blood vessels.
5. The light absorption spectrum of melanin is that the absorption coefficient decreases monotonously as the wavelength increases. Also in order to avoid the side effects of <480nm, and considering that melanin is only distributed in the epidermis, shallow penetration is required. Therefore, while using the lower limit of 540nm to treat vascular lesions, it can also effectively remove black at the same time. If there is no vascular disease on the face, the lower limit is 590nm. At this time, it can not only remove wrinkles and rejuvenate skin, but also remove melanin, achieving the effect of "rejuvenation and whitening".
6. Wrinkle-removing skin rejuvenation is the target of photon is dermal tissue. On the one hand, a certain depth of penetration is required. The longer the wavelength in the visible to near infrared range, the deeper the penetration depth. On the other hand, the volume of dermal tissue is much larger than hemoglobin, capillaries and melanin, and of course the required calories are much larger. The longer the wavelength, the higher the photothermal conversion efficiency. Therefore, the lower limit of the wave band for wrinkle rejuvenation is selected near the lower limit of the first treatment window. When the photon rejuvenation device is used to improve the dermal tissue structure, the range between 590-755nm is selected, which coincides with the wave band of hair removal. It is not a problem to do skin rejuvenation in areas without hair, and it may cause hair loss while doing skin rejuvenation in areas with hair. This should also be noted when doing other treatments.
7. The root of the hair is 3-5mm below the epidermis, so hair removal requires a deeper wavelength that penetrates the soft tissue. At the same time, due to the large volume of the hair follicles to be destroyed, the diameter is 30-100um, and long wavelengths with high photothermal conversion efficiency are also required. On the other hand, if the wavelength is too short, the melanin in the epidermis will be absorbed first, and heat will be generated in the epidermis before it penetrates into the hair follicles, which may cause epidermal damage. The lower limit of the wavelength of hair removal is generally selected at the lower limit of red light 640nm, and the range of variation is between 640-755nm.
8. At present, all photon skin rejuvenation instruments made in China are fixed at the upper end of the wavelength, and the lower end is replaced with filters with different parameters as needed. That is: the photon skin rejuvenation instrument is a continuous spectrum light source with a limited and variable spectral range. For example: when acne needs to be treated, the wavelength range is 380-1200nm; regardless of acne treatment, the wavelength range is 520-1200nm for vascular lesions or pigmented lesions; when skin rejuvenation and whitening are the main focus, choose 590-1200nm; The focus is on hair removal, and the filter is limited to the range of 640-1200mm.
9. No matter what kind of filter is installed, the photon meter always has a rich band. When the human body is irradiated by photons, different tissue components in the skin selectively absorb different wavelengths, so there are different effects in one irradiation. For example, when 430-1200nm is used for treatment, in addition to acne sterilization and debridement, it will also remove redness. At this time, the highest absorption peak of hemoglobin at 415nm will work, which is not available in the 520-1200nm filter. At the same time, the wavelengths required for blackening, wrinkling, and hair removal are also included. So photon has the effect of spectrum treatment.
