On the evening of March 27, from 20:30 to 21:30, "Earth hour", many landmark buildings around the world will extinguish the external landscape lighting. From the Sydney Opera House to the Forbidden City in Beijing, from Victoria Harbour in Hong Kong to the Seven Stars Hotel in Dubai, from Westminster Abbey in London to the Empire State Building in New York, people in 24 time zones around the world are passing on the darkness, allowing ordinary people to Stop in the dark, spend 60 minutes to pay attention to and understand the environment, and promote environmental protection to become the way of thinking and lifestyle of every ordinary person.
â€œEarth Hourâ€ is just a stylish and relaxing eco show. We can't turn off the lights forever, we can't have no lighting, we need to look for a greener light source, LED (Lighting Emitting Diode), which can make our lighting greener.
More environmentally friendly: 90% energy saving and 10 times longer life
The LED is a solid state semiconductor light emitting element. It uses solid-state semiconductor chips as luminescent materials, which are recombined by carriers in the semiconductor, releasing excess energy, stimulating photon emission, and directly emitting light of various colors. The color of the light depends on the semiconductor material used in the chip. Like computer chips, LEDs can be small, even with a fingernail size.
In 1955, Rubin of the American radio company first discovered the infrared radiation of gallium arsenide (GaAs) and other semiconductor alloys. In 1962, General Electric's Nick developed the first practical application of visible light-emitting diodes. LEDs have been used only as power indicators for radios or stereos for many years, and their range of application has expanded in recent years.
Now known as the fourth-generation illumination source or green light source, LED is energy-saving, environmentally friendly, small in size, long in life, etc. It can be widely used in various fields such as indication, display, decoration, backlight, general illumination and urban night illumination. .
Ke Cilei, CEO of Philips, said: "Under the solid-state conduction technology, the radio vacuum tube was replaced by a transistor, and the TV picture tube was replaced by a liquid crystal display. Eventually, such changes entered the field of illumination."
LED is DC drive, with ultra-low power consumption, single tube can reach 0.03~0.06 watts, electro-optical energy conversion efficiency is close to 100%, the same lighting effect, more than 90% energy saving than traditional light source, energy saving than ordinary energy-saving lamps 50 Above 100%, the life is 10 times longer than conventional light sources.
LED light sources are more environmentally friendly. There is no ultraviolet light or infrared light in the LED illumination source, no heat, no radiation, and no glare effect. In the process of manufacturing, the LED light source does not involve heavy metal elements such as mercury, and is harmless to humans during use, and can be recycled after being discarded. LED is a solid-state cold light source, no heat is generated, can be safely touched, and is a typical green light source.
Wide application: 2010 production value of 10 billion
There are many changes in color. The LED light source utilizes the three primary colors of red, green and blue. Under the control of computer technology, the three colors have 256 levels of gray, and can be mixed arbitrarily, that is, more than 16 million colors can be produced.
LEDs can be combined with a variety of new technologies to achieve a richer set of features. The traditional light source has only a single luminous effect, and the LED light source belongs to the low-voltage microelectronic product, and can be combined with computer, network communication, image processing, and embedded information technology to become a digital and multimedia information product.
Advances in the materials and processes of the manufacturers have led to a continuous reduction in the cost of the light-emitting chips and an increase in performance. Robert Steele, an analyst with unlimited strategy in the US LED industry market research organization, said: LED will open and revolutionize our new ideas for lighting.
At present, the most widely used field of LED is to provide backlight for LCD monitors and mobile phone buttons, followed by building lighting, new traffic lights, and car dashboards. It is expected that global sales of LED lighting products will reach 10 billion US dollars in 2010.
In June 2007, Apple introduced a Macbook Pro notebook computer with a mercury-free LED backlit screen. The adoption of LED technology not only cut off the dangers of heavy metal elements on the manufacturing and use of people, but also made the screen backlight more uniform and reduced. Display power consumption.
Ford's Mustang has adopted LED dashboards with more than 100 colors to choose from. LEDs are also used in the interiors of Boeing's new 787 Dreamliner, which creates a favorable lighting atmosphere that helps passengers travelling across long distances to adjust the time difference better.
In China: LED is at your fingertips
The opening ceremony of the Beijing Olympic Games is not only a grand event for sports, but also the biggest LED light show in history. In Beijing, many traffic lights no longer follow the traditional three red, green and blue light bulbs in sequence, but an LED device changes the color according to the situation. In Shanghai, at the beginning of the Hua Deng, many huge LED advertising screens on both sides of the Pujiang River sloganed the slogan of â€œBetter City, Better Lifeâ€ at the Expo.
LED has penetrated into our lives. On March 28, 2010, the reporter learned at Beijing Yijia Home, where LED chandeliers and table lamps can be purchased. The reporter consulted the salesperson about a LED desk lamp with a price of 199 yuan. The staff said: This desk lamp is a solar work light and does not need to be connected to a power source. In the sunny day, the solar panels are directly exposed to the solar panels for 4 to 5 hours, which can guarantee the lighting demand for 3 to 4 hours at night. If it is cloudy, it takes 8 to 9 hours.
On March 29, 2010, the first solar photovoltaic curtain wall LED lighting system in Hubei Province began operation in Wuhan Torch Building. This is a high-tech, low-energy office building. The exterior wall is made of transparent solar glass curtain wall, which converts solar energy into electric energy. It not only plays the role of ordinary curtain wall decoration, lighting, sound insulation and heat insulation, but also the public corridor and underground parking of the building. Power is provided for the field, outdoor roads, and landscape lighting. LED lighting consumes 1/8 of the incandescent bulbs and has an average life of 100,000 hours. This system can reduce the emissions of harmful substances such as carbon dioxide and sulfur dioxide by 9936 kg per year.
In China, the electricity consumption of lighting accounts for about 12% of the total electricity consumption of the whole society. If all the existing ordinary incandescent lamps are replaced with energy-saving lamps, it can save more than 60 billion kWh per year, equivalent to the year of the Three Gorges Power Station. Power generation. During the â€œEleventh Five-Year Planâ€ period, China will promote 150 million energy-saving lamps, save 29 billion kWh of electricity, and reduce carbon dioxide emissions by 29 million tons.
Nowadays, with the growing concern about global energy shortages, energy conservation and environmental protection has become the primary problem we need to face. The application of LED lighting products has attracted the attention of the world. As a new type of green light source, LED will lead the development trend of the future lighting industry. When LED led the lighting revolution, it also made great contributions to environmental protection, energy conservation and emission reduction.
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