Another important factor about HID lights is that they emit colored lights. The colored lights are represented with numeric coding. The coloring function of these bulbs depends on the heat generation. You can get blue, yellow or violet colored lights from HID to name a few. This illumination technology is widely used by many automobile manufacturer brands. HID kits ensure greater and clear visibility for the automobile drivers. The installation process requires no drilling or other modifications. In fact, this HID lighting systems are proven to reduce significantly the occurrence of eye fatigue and enhance concentration on the road. The life duration of such bulbs is higher than normal incandescent lamps. They emit bright and clear light. HID kits increase the visibility up to 70% more than halogen bulbs and provide 3 times more illuminated coverage than ordinary lamps. The service life period is up to 10 times longer than any other lighting systems. Vehicles that have HID kits are required to be equipped with headlamp lens cleaning systems and automatic beam leveling control. They reduce the tendency for high-output bulbs to cause high levels of glare to other road users.Differentiate D1S, D1R, D2S, D2R, D3S, D3R, D4S, and D4R production burner categories . The D stands for discharge, the number is the designator type. The final letter describes the outer shield. The arc within a HID bulb causes considerable short-wave ultraviolet (UV) light, but none of it escapes the bulb, for a UV-absorbing hard glass shield is incorporated around the bulb's arc tube. "S" burners ( D1S, D2S, D3S, and D4S) mean that bulbs have a plain glass shield. They are primarily used in projector-type optics. "R" burners ( D1R, D2R, D3R, and D4R) are designed for use in reflector-type headlamp optics.