1. The concept of the ideal realm of LED and green lighting
Years ago, the United Nations emphasized in a report that the environmental and energy problems caused by the rapid growth of human needs have caused a new crisis of survival for human beings and proposed a sustainable development strategy to the world. The facts are indeed very serious. Due to the rapid development of human industry, agriculture, shipping and living needs, coal and oil resources are insufficient, and they will be exhausted in decades. Moreover, the growth of industry has led to a sharp increase in emissions, and the ozone layer that protects humans from ultraviolet rays is becoming increasingly thin. The terrible hollows, the greenhouse effect and the warming caused by the global warming have become very serious; humans have deforested plants, resulting in a shrinking green coverage of the earth, large-scale desertification of the land, depletion of many rivers and lakes, plants and animals. The rare species are constantly disappearing. There are dozens of countries on the planet that have emerged water crisis (including China). Industrial and industrial production and the abuse of organic chemicals, air and water quality problems have caused serious pollution in the human food chain, and even some harmful substances have been detected in dairy products and breast milk for feeding infants; such as antibiotics, pesticides Wait, human beings are unclear, and there is no way to verify, and the disease that cannot be resisted is strangely coming. Malformations, dementias, cancers, and freaks have become commonplace. On the one hand, human beings produce a wide variety of products that are extremely rich in order to meet their growing demands for life; on the other hand, the uncontrolled consumption of energy and the pollution caused by the environment have created new disasters for human beings. .
Green lighting is also proposed in this situation. What is true green lighting? Our company puts forward the view from the perspective of discussion, and believes that the ideal realm of green lighting should be examined from the following aspects:
(1) Mercury-free: Mercury is toxic, and it is endless after polluting the environment;
(2) Energy saving: not only the lighting should be saved, but also the production process of light sources and lamps from raw materials to finished products should be conducive to energy saving;
(3) Material: The light source and its accessories should save the consumption of ferrous metals, non-ferrous metals, rare metals and non-metallic materials;
(4) Environmentally friendly manufacturing process: discharge non-polluting and green production processes, including the use of non-toxic, solvent-free resins and sealing materials, and promote the use of water-soluble resins;
(9) Green waste: After the failure, the waste can be recycled, and there is no environmental pollution.
According to the above 9 items, we analyze most of the gas discharge sources (except mercury-free fluorescent lamps), including the third-generation HID or more advanced HID. If scored, the score is much lower than the LED. Even LEDs can't get full marks. It can be seen that the concept of green lighting cannot only stay on energy saving and high light efficiency, and there should be a comprehensive and comprehensive assessment point of view. Therefore, the real realization of green lighting, research and development is still a long journey, which is a challenge.
(5) The color is pure: the color is produced by the semiconductor PN junction itself, pure and thick;
(9) Good flexibility: The compactness of the LED light source enables the LED to adapt to the decorative lighting requirements of geometric size and different space, such as: point, line, face, ball, shaped body and even any artistic sculpture.
Because LED has a series of advantages, the author believes that LED has the following main directions in the research and development of landscape lamps:
In landscape lighting, the installation of lamps should protect the landscape, protect the environment, prevent the lights from being unsightly, beautify during the day, and brighten the art under the night. This requires the structure and installation of the luminaires to suit the circumstances. Due to the architectural characteristics, many standard luminaires cannot meet the above requirements. The flexible design of LED luminaires is especially suitable for the design of non-standard luminaires suitable for the scene, so that the landscape lighting and landscape can be coordinated to achieve a new level of landscaping.
Another example: three primary color LEDs, such as the use of 8 for digital gray control, the color category has reached a surprising level, reaching 16.77 million, even the name of each color you have no time to name. Of course, there are too many colors, and sometimes it doesn't make sense to beautify the landscape.
4.4 Electronic Control Features
At present, the electronic control structure of LED lamps mainly has five categories or more: single lamp control, group lamp control, long or super long span lamp control, sound control, and induction control.
The focus of LED microelectronic control circuit optimization design is: reliable, excellent price, using universal components. For the control of long or super long span lamps, there are the following requirements: light strips of tens of meters, hundreds of meters or even more than kilometers or point sources of linear layout. The goal of optimized design is: in motion control, it needs to be rich in color, varied and varied, including both jumps and gradations, and also requires minimizing the number of wires. Of course, there are many specifications that can be adopted, such as C-BUS system, IEEE Standard 802, etc., but many occasions are not necessarily used, and the price is high, and the market competitiveness is poor. To this end, our company has successfully developed a new system with superior cost performance.
5. The main problem to be overcome in LED development
LED enters the field of lighting is a new thing, with epoch-making significance. However, like any new technology, LEDs still have some areas that need improvement.
5.1 Development of LED high power point source
Internationally, large companies such as Philips, GE, and OSRAM have double-ended spherical HID products, which are the most advanced high-power HID light sources in the world, especially the stadium lighting fixtures based on Philips. The curve is very good. Although LEDs have many unique advantages, they are currently blank. A high power density point source may be a major technical difficulty for LEDs based on the principle of semiconductor illumination.
Of course, one can say that a sprint world champion cannot be a world swim champion at the same time. Therefore, this issue is temporarily an expectation.
5.2 Develop a compact modular LED power supply with high efficiency, high power factor and excellent price
LED power supply is simple, both DC power supply and pulse power supply. There is no trouble with HID and high pressure neon lights. At present, the inefficient power supply system drags the hind legs of the LEDs, and the energy saving level is greatly reduced.
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