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UVC 290 nm
UVB 320 nm
UVAII/UVAI 340 nm
Visible 400–765 nm
Infrared 2,000 nm
In general, the longer the wavelength, the deeper it penetrates into tissues.
Redness and rejuvenation: 560–1,200 nm
Pigment and rejuvenation: 590–1,200 nm
Darker skin types: 640–1,200 nm
Hair removal for light skin types: 695–1,200 nm
Hair removal for darker skin types: 755–1,200 nm
Although light therapy has been used worldwide for more than 40 years, its popularity for cosmetic enhancement only recently has increased exponentially. In fact, it has become so popular so quickly that most skin care professionals aren’t educated on the variety of light-based technologies available, as well as informed about who can use them legally. Lasers, intense pulsed light (IPL) and light-emitting diode (LED) treatments are three current light-based technologies that are used commonly for skin rejuvenation.
The visible light spectrum is the most familiar—the wavelengths are from 400 nanometers (nm) to 765 nm, which are seen combined as white light and diffracted as a rainbow. White light is composed of colored light. Daylight and standard light bulbs give off light in this range.
Estheticians already should be familiar with the ultraviolet (UV) portion of the spectrum: 0–400 nm. These are the invisible wavelengths that cause UV damage, such as sunburns and photoaging. UV light also is used by estheticians to kill bacteria on their instruments.
Wavelengths that are less likely to be familiar are in the infrared range: approximately 765–2,000 nm. These also are not visible to the naked eye.
Wavelengths that are used most commonly in skin care range from 400–10,600 nm. That range of the electromagnetic spectrum includes visible, infrared and far infrared. Lasers, IPLs and LEDs all fall within this range. (See The Electromagnetic Spectrum.)