A tan is damage to the skin.  When it is damaged it creates “tan” or colour. This is “melanin” deposits in the skin. The laser is attracted to melanin. The technology in the Lightsheer allows the skin to be cooled effectively to not traumatize the “tan” but the energy of the laser must be reduced to accommodate a tan. Therefore the client may require more treatments than someone without a tan. To have a more effective treatment it would be better to not have a tan.