Nilight HID Bulbs, HID stands for High-Intensity Discharge. These headlight bulbs, also known as Xenon Gas Lights, are very efficient and provide bright illumination in even the darkest of surroundings, coming in a variety of different applications. For vehicles that came equipped with HID lights from the factory, they use specific HID Bulb applications. Those applications are D2S, D1S, D4S, and D3S HID Bulbs. Shop Online! 24hr Dispatch. Local Distribution Centre.