The E-light laser or IPL technologies apply short shots of about 2-300 millimeters per second, releasing a huge amount of energy (12-120 J/cm). This energy is transferred to the hair root by means of melanin, where a temperature of 65-72 C is produced.
The skin as well as the red blood cells have a similar constant absorption to melanin and as a result they absorb the high levels of energy that are produced by laser and IPL methods.
On the other hand, SHR technology uses the method of melanin only partially (50%), and combines the in-motion technology, by heating the skin smoothly and enabling the penetration into the follicles that produce hair.
Research has shown that a slower but longer heating process is significantly more effective for permanent hair removal than a short and high heating process. So, when you use the SHR, the laser goes through the tissue many times (in motion) with low energy and a larger number of repetition(up to 10hz/s) in contrast to the traditional method of individual pulses of high energy. So, the melanin of hair as well as the tissue of stem cells, are heated by low levels of energy in slow pace providing painless application and better results.