An LED (light-emitting diode) is a light-emitting semi-conductor with has a much longer service life and a lower power consumption than conventional bulbs. The advantages of LED technology over conventional bulbs are their lower energy consumption, shorter response time, more compact design and a longer service life (lasts the entire life of the vehicle). Volkswagen installs LEDs, for example, in the rear lights as well as in the turn indicators in the exterior mirror housings. Thanks to their brief response time, light-emitting diodes are perceived more quickly by other road users. If a driver sees the brake lights of the car ahead sooner, this can help to reduce his stopping distance by around 5.5 metres at a speed of 100 km/h (in the appropriate conditions). The high functional reliability and service life of LEDs increase safety thanks to the fact that rear lights and brake lights are less likely to fail.