[Closed] Why are LED traffic lights so popular all over the world nowadays?

Every time you stop at an intersection, you may notice the glowing LED traffic lights. Older incandescent bulb-based traffic signals have been replaced with the more energy-efficient LEDs in cities all over the world. These traffic signals have three main advantages over incandescent models—improved visibility, longer shelf life, and lower energy costs.
The development of commercially feasible LED traffic lights was originally hampered by the limitation of [url= http://www.nobleled.com/en/showroom/LED_traffic_light/300mm_traffic_module/ ]traffic signal module[/url]. At first, LEDs could only produce the color red. Further refinements in the technology have now produced the three colors used for traffic signaling: red, amber and green.
One major advantage of these traffic lights is increased visibility. Incandescent bulbs were often covered by color filters, reflectors, and glass lenses, which could affect how much light actually reached drivers' eyes. LED traffic lights use an array of bright LEDs that do not require additional filters or amplification. If a single incandescent bulb burns out, the entire light sequence is disturbed. Several LEDs can fail in these lights without causing a noticeable disruption. A catastrophic failure involving all of the LEDs in a panel would be rare indeed.
Another advantage is lower maintenance costs. Almost all of the cost of LED traffic lights are upfront — LEDs are expensive, and the traffic lights themselves require more labor to produce. These expenses are usually offset by lower maintenance costs. If an incandescent bulb burns out, which happens three times a year on average, a trained city employee must replace the bulb while traffic is diverted. [url= http://www.nobleled.com/ ]LED traffic lights[/url], on the other hand, may only require the cleaning of the protective lenses once a year. The individual light panel often has a longer shelf life of up to ten more years, depending on the conditions.