Light-emitting diodes (LED) have been used for taillights, turn signals, and cabin lights for some time now. With the technology advancing to the point where an LED setup can produce more light than a traditional incandescent headlight while using less energy and producing less heat, carmakers like Audi are starting to use LED bulbs as their main source of illumination. What this means is greater, cleaner visibility, with a design way iller than anything we've seen so far.