What is an auto regulator ballast for the street light?

When I am checking the information about street lights, I find they have different ballasts. I want to know how the auto regulator ballast works.

The auto regulator ballast is also called a constant-wattage autotransformer (CWA). It can limit the current and transform the voltage. They can handle a +10% line voltage variation. Over the range, they can maintain the wattage within +5%, which is better than reactor and lag auto ballasts. They can also keep the light on when there is a sudden voltage drop. They are widely used in HID street lights.

More reading: 7 Types of Street Lights Classified by Light Sources

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