a1-02 dual lamps cold light source, one is xenon light bulbs, and the other is halogen light bulbs. on the basis of the single machine, is a new generation products of improved cold light source. the high intensity light source consists of a power supply, cooling fan, brightness controls, and a spare lamp to enable procedures to be finished if the primary lamp fails. it is important that the light is as near in colour to natural light so doctors are able to detect very confortable. it is also important that the light does not heat the tissue.