Here's the basic science behind how xenon lights work: The electrical current hits the electrodes, creating a powerful electrical force. The electricity causes the xenon gas atoms to split into smaller parts (ionization) ... The electrodes heat up, and the heat causes additional light.

What is the point of xenon lights?

The xenon gas amplifies the brightness of the light, which helps it quickly reach the temperature required to emit a high-intensity beam.

Is xenon light legal?

Xenon HIDs are only road legal if the headlight unit is correctly E marked. If you're unsure, you're looking for an ECE R99 certification. There are only two ways for a HID kit to qualify as road legal: If the whole headlight unit is replaced with one specifically designed for HID.