Early LEDs were often used as indicator lamps, replacing small incandescent bulbs, and in seven-segment displays. Recent developments have
produced high-output white light LEDs suitable for room and outdoor area lighting. LEDs have led to new displays and sensors, while their high
switching rates are useful in advanced communications technology.
LEDs have many advantages over incandescent light sources, including lower energy consumption, longer lifetime, improved physical robustness,
smaller size, and faster switching. LEDs are used in applications as diverse as aviation lighting, fairy lights, automotive headlamps, advertising,
general lighting, traffic signals, camera flashes, lighted wallpaper, horticultural grow lights, and medical devices.