Similar to high-pressure mercury lamps or high-pressure sodium lamps, metal halide lamps also belong to the group of discharge lamps. Low pressure discharge lamps include fluorescent lamps and compact fluorescent lamps. In discharge lamps, light is generated by a gas discharge of particles created between two hermetically sealed electrodes in an arc tube. After ignition, the particles in the arc are partially ionized, making them electrically conductive, and a “plasma” is created. In high intensity discharge lamps, the arc tube is usually enclosed in an evacuated outer bulb which isolates the hot arc tube thermally from the surroundings, similar to the principle of a thermos flask. But there are also some discharge lamps without outer bulbs, as well as lamps with gas-filled outer bulbs. In contrast to low pressure discharge, there is high pressure and a high temperature in a discharge tube. In an arc tube, gas discharge works through excitation of the luminous additives (metal halide salts) and the mercury is excited by the current flow. Visible radiation characteristic for the respective elements is emitted. The mixture of the visible radiation of the different elements results in the designed color temperature.
Similar to high-pressure mercury lamps or high-pressure sodium lamps, metal halide lamps also belong to the group of discharge lamps. Low pressure discharge lamps include fluorescent lamps and compact fluorescent lamps. In discharge lamps, light is generated by a gas discharge of particles created between two hermetically sealed electrodes in an arc tube. After ignition, the particles in the arc are partially ionized, making them electrically conductive, and a “plasma” is created. In high intensity discharge lamps, the arc tube is usually enclosed in an evacuated outer bulb which isolates the hot arc tube thermally from the surroundings, similar to the principle of a thermos flask. But there are also some discharge lamps without outer bulbs, as well as lamps with gas-filled outer bulbs. In contrast to low pressure discharge, there is high pressure and a high temperature in a discharge tube. In an arc tube, gas discharge works through excitation of the luminous additives (metal halide salts) and the mercury is excited by the current flow. Visible radiation characteristic for the respective elements is emitted. The mixture of the visible radiation of the different elements results in the designed color temperature.
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