A gas discharge lamp is a glass bulb filled with xenon, in which two electrodes are installed at a certain distance (see fig. 14.54). When voltage is applied to the electrodes of the lamp, an arc discharge occurs. To ensure the normal operation of the gas discharge lamp, an electronic control device and a high-voltage unit are used. In order to form an arc discharge, it is necessary to apply a voltage of about 28,000 V to the lamp. A gas discharge lamp in relation to a 55 V halogen lamp provides twice the light intensity, while the lamp power is 35 V. Discharge lamps have a very long service life.
Vehicles with gas-discharge headlights have dynamic headlight adjustment in a vertical plane, which quickly responds to the inclination of the vehicle body.
Sensors located at the front and rear of the vehicle respond to changes in vehicle height. Based on the information from the sensors, the control unit sends signals to the actuator motors, which change the position of the headlight reflectors. This ensures constant and uniform illumination of the road when the car is moving. Manual headlight adjustment is not provided. If a defect occurs in the headlight range adjustment system, the headlights are set to the lowest position.
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