Do LED headlights require a ballast?

[OGriffin]

Most LED headlights do not require a ballast, but in practice, it is necessary to analyze based on the specific vehicle model. For example, the LED bulbs of the Teana come with a built-in ballast, so replacing the LED bulbs also requires replacing the ballast. The principle of the ballast: it instantly converts 12V current into high voltage and maintains stable high voltage. This high-intensity voltage is used to activate the HID bulb to produce strong light between the two electrodes, achieving high-brightness illumination. The functions of the ballast: 1. It has a cold-start current of less than 6.5A, ensuring fast startup; 2. It features a wide-voltage design, ensuring normal startup under both low and high voltage conditions.