LED is an acronym for light emitting diode. These are very small semiconductors that emit light when a current is passed through it. In the past few years, specialised therapeutic LEDs that have extra luminescence emitted through a very specific wavelength band, have been used for the purpose of skin rejuvenation. Unlike laser or IPL, LED phototherapy is non-invasive and non-thermal, and hence requires no recovery time after treatments. Also LED phototherapy involves the use of continuous light rather than pulses of light.
Different wavelengths of LED can be used to target various skin conditions from acne to ageing skin. Each wavelength will penetrate a different depth and have a different effect on the skin.