Why do some Audi A6 models have different headlights?

I noticed that some Audi A6 models have LED headlights while others have HID. What is the difference and why do they have different options?

LED headlights use light-emitting diodes to produce light, which are more energy-efficient and longer-lasting compared to HID headlights. The difference in options is often based on the trim level and price point of the car.

While both LED and HID headlights provide better visibility and are more durable than traditional halogen headlights, LED headlights offer a more focused and brighter beam. Different models may have different headlights as a way to offer customization options.

LED headlights also have a faster response time and can be programmed to have different lighting patterns, such as adaptive high beams. This allows for enhanced safety and convenience while driving at night. Some models may offer different headlight options as part of a higher trim or package offering.