HID lamps and ballast circuit diagram The term High Intensity Discharge or 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 is therefore utilized to limit this current to the correct level for proper operation of the lamp.

In general, these systems feature long life, high light output for the size of the lamp and increased efficiency compared to fluorescent and incandescent technologies. lamps are named by the type of gas and metal contained within the arc tube. There are five different families of : Mercury Vapor, High Pressure Sodium, Quartz Metal Halide, Pulse Start Quartz Metal Halide, and Ceramic Metal Halide.

Lamps Types Types
Mercury Vapor High-Reactance Autotransformer
Constant Wattage Autotransformer (CWA)
Metal Halide Linear Reactor (Pulse Start)
High-Reactance Autotransformer (Pulse Start)
Constant Wattage Autotransformer (CWA)
Super Constant Wattage Autotransformer (SCWA) (Pulse Start)
Constant Wattage Isolated (CWI)
Super Constant Wattage Isolated (SCWI) (Pulse Start)
Regulated Lag (RLB) (Pulse Start)
High Pressure Sodium Reactor
High-Reactance Autotransformer
Constant Wattage Autotransformer (CWA)
Constant Wattage Isolated (CWI)
Magnetic Regulator (MRB)

The following file contains detail information about Lamps and , available input voltage, maximum input current, power factor, regulation, input watts loss, crest factor. and test (Short-Circuit Current Test, Continuity Testing and Open-Short Circuit Test Limits).

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