♔♔♔ HID lamps and ballast circuit diagram The term High Intensity Discharge or HID describes lighting systems that produce light through an electrical discharge which typically occurs inside a pressurized arc tube between two electrodes. Light is produced by an arc discharge between two electrodes located at opposite ends of an arc tube within the lamp. Electric discharge lamps have a negative resistance characteristic, which would cause them to draw excessive current leading to instant lamp destruction if operated directly from this voltage. The ballast is therefore utilized to limit this current to the correct level for proper operation of the lamp.

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