The lighting system having a plurality of winker lamps disposed on front and rear portions of a vehicle body, a winker switch, and a lighting control circuit which performs changeover function allowing the winker lamps at a front portion of the vehicle body to lit as position lamps. A device and a method for illumination of specimens in a scanning microscope is proposed, a laser being used to generate a laser beam, and an optical system being used to image the laser beam onto the specimen. The circuit utilises a single amplifier whose output is coupled to a current control block which is then used to drive a dual feedback loop of the amplifier. Imaging behavior of the image intensifier, and thus the sharpness of the image displayed on the output screen, vary depending on the resolution set for the camera. Conversely, an increase in thoracic impedance in combination with a decrease in max is indicative of the thorax being \u201ctoo dry\u201d.