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28 maj 2021 · Like all other gas discharge lamps, metal halide lamps have negative resistance, and with the rare exception of self-ballasted lamps with filaments, a ballast is required to provide proper starting and operating voltage and to regulate the current flow of the lamp.
Most ballasts (except electronic ballasts) used for metal halide lighting are the CWA (constant wattage autotransformer) type. This is a lead circuit ballast and consists of a high reactance autotransformer (core-coil) with a capacitor in series with the lamp.
19 cze 2023 · A metal halide lamp works by creating an electric arc between two electrodes inside an arc tube that contains a gaseous mixture of vaporized mercury and metal halides. The arc tube is connected to an electrical ballast that regulates the voltage and current supplied to the lamp.
Electronic ballast for 35 W metal halide light bulbs. The electric arc in metal-halide lamps, as in all gas discharge lamps has a negative resistance property; meaning that as the current through the bulb increases, the voltage across it decreases.
The reduced ceramic mass of the round tube enables the tube to heat up faster, reaching the photometric values more quickly. Similarly, when the lamp goes off, warm re-ignition is possible more quickly because the required cooler starting tempera-ture for normal ignition devices is achieved faster.
In HPMV lamps this involves the evaporation of a fixed amount of mercury. In traditional metal halide and Uni-Form pulse start lamps, a fixed amount of mercury evaporates and the metal halide salts partially evaporate.
halide salts. Metal halide is added to the . increase lumens and improve the light color. tage pulse across the tube to ionize the argon gas. Once the gas is fully ionized, a sustained arc extends from one electrode to another and cu.
