In Part 1 of this series we found out what Lasers are and why they can work in skin photorejuvenation.  In Part 2 we’ll discuss LED’s and why they work so well when used as the light source in photo rejuvenation devices.

We’ll start with exactly what an LED is.  The term LED is derived from the beginning letters of the words Light Emitting Diode.  A diode is basically a computer chip.  So, an LED is a small computer chip that when, a small electrical current is passed through it, will light up or “Emit Light”.  The diode is encased in a clear resin that can be shaped causing the light to cover a wide or narrow area.  Now, the factors that determine the color of the light are the elements that the diode or chip is made of, different combinations of different elements create different colors of light.  As a side note, you will often see the term wavelength used to describe the light coming from LED devices; this term refers to the color coming from the device.