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Constant-Wattage Autotransformer (CWA) HID Ballast Circuit Diagram
Also known as lead style ballasts, Constant-Wattage Autotransformer (CWA) ballasts are the most common ballasts used on 175 W or higher MH lamps. It offers the best compromise between cost and performance, means of providing stabilized light output (lamp regulation) as opposed to the Magnetically Regulated circuit. It is a high power factor devise, utilizing a capacitor in series with the lamp. A ±10% line voltage variation will result in a ±5% change in lamp wattage for Mercury, or ±10%
change in wattage for Metal Halide. Below picture shows a typical Constant-Wattage Autotransformer (CWA) HID Ballast Circuit Diagram.
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