Environmental protection and energy conservation have become the topic of concern worldwide. 149 countries signed the "Kyoto Protocol": By 2012, greenhouse gas emissions will be reduced by an average of 5.2% on the basis of 1990, and many regulations and promotion of energy-saving products have been formulated since the date of signing to achieve this goal. . In China, with the economic growth and the increasingly tight resources, the pace of energy conservation projects and the use of energy-saving products is also accelerating. For example, from April 1 this year, public building projects with a building area of ​​over 20,000 square meters in Beijing must be reviewed for energy conservation, otherwise they will not be approved or approved.
In China, public facilities have always been the main battle tide of energy-saving campaigns because of their large electricity consumption. Taking urban public lighting as an example, it accounts for 30% of China's lighting power consumption, about 43.9 billion kWh. But energy conservation and reducing greenhouse gas emissions do not mean to reduce the quality of urban lighting. How to save energy and reduce greenhouse gas emissions without “small gas†or even better urban lighting effects? It is vital.
Warm white light: the all-around champion of economic environmental protection and color expression
In the development of road lighting, there has always been competition between “Huangguang School†and “White Light Schoolâ€. The representative of "Huangguang School" is the mainstream high-pressure sodium lamp. Because it is economical and energy-saving, it also has excellent fog-passing performance, so it has become the mainstream street lamp choice in China. Even so, Huang Guang has its drawbacks that cannot be overcome naturally: that is, the color reproduction ability is poor. Everyone will have the impression that under the sodium light, the color of any object is yellowish and distorted, which makes the colorful city nights "stainless".
The goal of the "White Light School" is natural sunlight. Because it has the best color performance, and the sun is a warm white light. Therefore, if you can achieve white light similar to daylight, and at the same time take into account the advantages of Huangguang's economical energy saving, it will be an ideal night lighting option. The "player" of the "White Light" is a quartz metal halide lamp. Although it has more than 3 times higher color performance than yellow light, it is also not widely used due to some insurmountable technical problems. Therefore, in this round, the "White Light School" did not achieve the full victory of the "Yellow Light School."
"New Army" of "White Light School"
The emergence of warm white light urban road lighting system has found the answer to this problem "fish and bear's paw". Because the warm white light is close to the performance of the sun, it can give passers-by a warm feeling, and at the same time have better visibility, people can easily distinguish the characteristics of the road and the surrounding environment under warm white light. Compared with yellow light, it can better ensure the safety and comfort of road driving. Moreover, because of the bright light and the "horsepower", warm white light will give people a psychologically sufficient sense of security. This kind of security is also a powerful help for preventing urban crime.
Compared with yellow light, the core advantage of warm white light is that it is more efficient and consumes less power. The same street lamp uses at least 10% less electricity than yellow light, reducing carbon dioxide emissions by 40%. Therefore, it meets the requirements of environmentally friendly lighting and green lighting. Now, with the energy crisis and the increasing greenhouse effect, there is great potential for popularization.
The advanced concept of warm white light was first proposed by the world famous lighting company Philips, and has been widely used in the United States, Britain, Belgium, Norway and other countries.
Warm white lighting in Shanghai
At present, China is also facing the problem of how to choose a newer and more energy-efficient street lamp. In order to adapt the system to China's national conditions and to accumulate the necessary data for large-scale applications, Philips Lighting and Fudan University began scientific research and analysis of the system's introduction of China's projects in early 2006.
With the support and cooperation of Shanghai Electric Power Company, at present, this warm white light road lighting system has been installed in the main trafficway of Shanghai, Qixi North Road and the bustling commercial street, Qipu Road, and entered the testing stage.
The test results at the end of 2006 showed that the streetlights of the Tunxi North Road, which is the main thoroughfare of the traffic, were reduced by half compared with the previous ones without reducing the lighting effect. On the pedestrian-oriented Qipu Road, most of the respondents It is believed that the warm white light is more comfortable and more willing to stay here, which also adds more nighttime business opportunities to this commercial district. It is reported that Fudan University and Philips Lighting are planning to expand the scope and depth of the test based on the previous research and accumulate more data and experience. A more complete and comprehensive study will be available later this year.
A harmonious road lighting environment is also one of the requirements for building a harmonious society. Harmony for road lighting means making people feel more comfortable and safer underneath, while minimizing electricity consumption and environmental protection. The night is more exciting, this is a wonderful life experience brought by the ever-developing lighting technology. The new generation of warm white light urban road lighting system makes people's happy laughter in the daytime can continue to extend to the depths of the night.
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