This article does not discuss the roads that LED street lamps have passed in the past few years, nor does it discuss the problems that arise in the process. I mainly want to introduce some foreign countries and see what foreign colleagues are doing and how to do them. And the decisions of the people involved.
I. Overview (1) Standards for domestic road lighting The latest version of the road lighting standard in China is the 2006 version of the CJJ45 urban road design standard. It is combined with the contents of the relevant documents of CIE and IESNA. In view of the fact that the technology of LED is still not mature at that time, the noun of LED in the file is normal, of course, it is impossible to use the characteristics of LED dimming in text. Make relevant explanations in the middle. Therefore, measures for energy conservation can only be limited to the light efficiency of the light source and improve the utilization of light.
(2) Problems in the application of LED street lamps LED lighting is an emerging industry. Looking at it, it is a light source of 2, which has the advantage that the traditional light source can't match in the utilization of luminous flux. Therefore, when the energy efficiency is comparable to that of high-quality sodium lamps, it is still very good. However, there is a difference between theory and practice. Many places have been doing it without trial. Under some imperfect or irrational driving, many domestic enterprises have invested, after a few years, not Less companies are entering a dilemma, with only a few successes.
Due to the distance and practical deficiencies in the understanding of road lights and road lighting, and for various reasons, it has encountered many difficulties and it is very difficult to promote. At present, it seems that there are mainly the following problems: energy efficiency, light decay, interchangeability, reliability, etc., which leads to the current state of progress in many places in China is not ideal; it seems that it is not easy to get this piece of cake.
(3) A small amount of other light source street lights enter the LED street light is not smooth, some companies that manufacture other light sources enter the industry, there are ceramic metal halide lamps, electrodeless fluorescent lamps and other new light sources to do street lamps, trying to replace HPS (high pressure sodium lamps) ), there are also implementation cases. However, it seems that in addition to ceramic metal halide lamps (similar to the low color temperature white light of Philips cosmopolies), promotion is difficult and there is an increasing trend. In the Haining City of Zhejiang Province, thousands of ceramic metal halide lamps were used and installed on motor vehicles and small roads.
Figure 1 The situation of CDM light source used in Haining City, Zhejiang Province is more than 6,000. (4) The international government and organizations are involved in the effort. There are currently about 2.2 billion street lamps in the world, and the number is very large. If there is improvement and improvement in this area, it is undoubtedly a good topic for environmental protection and green emission reduction. Today, the 40 cities of the world's 40 cities are encouraged by New York City Mayor Glenn Bock. activity.
Different cities have different ways to reduce greenhouse gas emissions. The change of road lighting source is an important means and content. For example, Los Angeles, California, USA and Anchorage, Alaska, need to replace 160,000 HIDs. The streetlight is an LED streetlight. This is the message sent by the mayor Antonio Villaraigosa from Los Angeles Machine News on February 16, 2009, and the multi-city climate reduction meeting of former President Clinton at the Clinton Foundation. At present, Los Angeles has replaced more than 60,000 street lights as LED street lights.
Second, the recent promotion of new light sources for street lamps abroad (1) The government supports the example of interventional LEDs. On February 12, 2007, the government promoted the use of LEDs as a streetlight source for government support projects, starting in the Raleigh City Department of North Carolina. It is a LED city white light project that promotes urban lighting in the streetlights led by the US Department of Energy (DOE). On September 29, 2010, DOE and CREE jointly announced that members of the LEDCity program in the world will cooperate with DOE. Solid State Lighting Federation cooperates. At present, there are 24 cities participating in the world. The cities participating in the program include New York, San Francisco, and Los Angeles. China also has Huizhou and Tianjin in Guangdong, Bremen in Germany, and Apecio in Italy. The Municipal Solid State Lighting Association will conduct technical assessments of the cases involved in the experiment and provide ongoing organizational support, as detailed on the DOE website.
DOE promotes the LED lighting practice practice is not limited to outdoor lighting, but also the case of indoor lighting, but the report form is titled gateway, meaning the road to entry. In the past two years, the summary of the outdoor lighting test of the gateway is shown in Table 1. As can be seen from the table, there are different types of places such as residential areas, 32 lanes, overhead lights (sidewalks), and squares. It can be seen that these tests are not used on roads with high-speed cars. US DOE-guided LED test site (2) Example of white-light ceramic metal halide lamp At present, the mainstream light source for foreign road lighting is HPS. In Europe, CPO (a low color temperature white light ceramic metal halide lamp, color temperature is about 2750K, Ra70 or so, PHILIPS calls Cosmopolies) a popular source of light for road lighting in auxiliary roads, non-motor vehicle lanes and residential areas. In the United States, it is called ceramic metal halide lamp CMH.
In May 2010, LD A magazine reported that after comparing CMH, LED and electrodeless fluorescent lamps in Chicago, the second largest city in the United States, it decided to use CMH as the preferred light source for Chicago street lamps in the future, and in the first 400-kilometer west forest shade. 15,000 are used on the avenue and are currently installed.
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