LASERS provide a special form of light that, in addition to a powerful parallel beam, consists of only one wavelength (one colour). This makes them ideally suitable for a specific skin treatment, such as hair removal or rosacea. Hair removal lasers use a specific wavelength that is only absorbed by pigment (in the hair), without heating the surrounding tissue. These laser systems have been specially developed for hair removal. Flash lamps (IPL, VPL, LHE) emit a wide range of wavelengths, just like a regular lamp. As a result, they do not only work on the pigment, but also on the moisture in the skin and the red blood cells in the blood vessels. The VPL and LHE systems are variations on IPL and are therefore not LASER. Flash lamps can damage all tissue components in and directly under the skin. But by using a filter for the lamp, certain wavelengths are removed and rendered harmless. The bundle of light now released can be used for hair removal without damaging other tissue. However, a large part of the light is lost as a result. So less heat is released to the hair. The flash lamps also work with large heads. As a result, the energy power decreases even more and therefore the destruction of the hair follicle is less effective. This is one of the reasons why more treatments are needed with flash lamps than with LASER.