Aftermarket HID Ballast
This helps establish an arc between two electrodes on the lamp, which is what causes HID bulbs to light up. The other key function of a ballast is to keep your lamp running and make sure the output is steady. After the electrode arc is established, the ballast reduces the voltage and regulates the electric current.
(NOTE: Actual product may look different from the photo, for non-canbus models only)
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