Undoubtedly, the Beijing Olympics is a model for the successful application of high-brightness and high-power LEDs. The fabulous opening ceremony is almost the stage for LED display. The Olympic rings, countdowns, and bird's nest scrolls show the LED technology. This large-scale use of LED and semiconductor lighting technology and products is not only an important breakthrough in the history of the Olympics, but also deeply meets the needs of the era of energy conservation, emission reduction and environmental protection. Not only that, the vast majority of ordinary people have a deep understanding of LED through the Olympic Games. Many provinces and cities have also launched corresponding projects to promote the use of LED. At present, the landscape lighting of some large and medium-sized cities such as Shanghai, Xiamen, Beijing, Dalian and Nanchang has already been quite Scale, completed a considerable part of the LED lighting demonstration project. The successful completion of these demonstration projects in large and medium-sized cities, coupled with the success of the opening ceremony of the Olympic Games, led to the further development of LED lighting products in county-level cities. It can be said that the overall development direction of LED landscape lighting industry is relatively good.
But there is no denying that there are some problems with the overall design:
First, the quantity is not quality: the general pursuit is more and brighter, look at it, the city lighting is LED shining, the light pollution phenomenon is more serious, how to give the people a beautiful, comfortable and truly environmentally friendly and energy-saving lighting effect, also Industry designers need to think more.
Second, the price is not quality: Many designers often do not know enough about the performance of the LED device itself. In the choice of LED, only the brightness and price are pursued. The reliability of the LED is often not paid enough attention. The dead light and the attenuation are more serious, leading to completion. Some of the post-illumination projects are just "a short-lived" and can't stand the test of time. It is a departure from the original intention of energy saving and emission reduction.
At present, in terms of LED efficiency, compared with traditional light sources, teaching is not much different, and even better than traditional light sources. However, because LED lighting is still a new industry in China, the corresponding supporting industries are still not perfect. Lack of talent with the overall design capabilities of LED luminaires. Among them, the color drift and light decay of LED lighting fixtures are still the main problems to be solved. Many users blame the decay of the brightness of many LED luminaires on the excessive aging of LED devices, but this is not true. It is true that the attenuation of LED luminaires does have a lot to do with the choice of LEDs, but the optical design and thermal design of the luminaires also play an important role in the light fading of the entire LED luminaire. In addition, as a semiconductor device, the driving mode of the LED is very different from that of the conventional lamp, and the selection of the driving chip, the arrangement of the LED, the wiring mode of the PCB, etc. all need to be researched and changed accordingly. It is also worth mentioning that at present, the high-end manufacturers of lenses, driver ICs, and heat-dissipating substrates are mainly foreign or Taiwanese manufacturers. This has brought some obstacles to the technical exchange between domestic lighting manufacturers and their supporting manufacturers, and it is also one of the reasons hindering their rapid development.
At present, the technological innovation of LED landscape lighting industry can be summarized as follows.
The sense of art is strengthened: through the mediation of LEDs, dynamic regulation can be realized. The peripheral lights of the Olympic Bird Nest are taken as an example. Through the regulation of LED colors, the technical effect of “China Red†is realized.
Intelligent development: Take the water cube lighting as an example. It uses a unique transparent light transmission technology in the cavity. It uses three basic color LEDs of red, green and blue to control 100,000 control points and millions of devices through computers. It presents 16 million colors to imitate a variety of beautiful scenes, creating a space with "water" as its life and theme, showing the overall image of blister crystal clear and transparent.
Strengthening economic and economic development: Taking Chongqing as an example, in July this year, the LED demonstration project for night landscape lighting has been basically completed. The central business district of the main city and the lighting of the landmark buildings have basically used intelligent LED lighting systems. Among them, LED power consumption is only 1/10 of that of ordinary lamps. If it is calculated according to Chongqing's 200,000-inch traditional night lighting, the annual electricity cost of Chongqing's lighting will exceed 100 million yuan.
In landscape lighting, LEDs can play a leading role mainly depending on the following points:
1. It can be seen that the overall efficiency of LED lamps has exceeded many traditional light sources, and is still rising at a rate of 20% per quarter, and the efficiency upside of many conventional light sources is approaching the limit.
2, small size: the current thickness of the LED chip can be made up to a few millimeters, can be highlighted in some applications that have specific requirements for size.
3, long life, high reliability: landscape lighting is mainly outdoor, often subject to harsh environments such as wind and rain, and LED mechanical performance is high, its life theory can reach more than 50,000 hours, can reduce a lot of maintenance costs in cost .
4, dynamic dimming: one to achieve color changes, and second, you can adjust the brightness according to the specific application environment, and further energy saving.
5, the traditional light source tends to have a narrow color temperature range, the electrodeless lamp is mainly cold white light, the metal halide lamp is mainly warm white light, and the LED can provide a white range of cool white, neutral, warm white full series, according to different applications. The scene application range selects LEDs of different chromaticities.
6, environmental protection: no harmful metals such as mercury.
Based on the above advantages, LEDs will surely get more and more applications in landscape lighting.
As the country attaches importance to energy conservation and emission reduction, the development of each city is bound to be a development of conservation-oriented environmental protection. The development direction of landscape lighting engineering will inevitably lead to this development direction. The advantages of LEDs determine its dominant position in future landscape lighting. Especially in some smart lighting, LEDs can play a larger space.