In recent years, the latest research results in the international road lighting industry show that in the intermediate visual state (0.001-3cd/m2), the effective light effect value of the warm white light source containing more short-wavelength spectra exceeds the effective luminous efficacy value of the high-pressure sodium lamp. The accuracy and speed of the human eye will increase as the color temperature and color rendering increase. In addition, under the situation of China's energy shortage, the use of products with high color temperature, good color rendering and good energy-saving effect has become a new trend in the development of the road lighting industry.
In 2005, Philips launched a warm white light road lighting system in Europe, which greatly improved the light efficiency and color rendering of the high-pressure sodium lamp system; it can save more than 44% energy than the high-pressure sodium lamp under the condition of meeting the illumination level.
In order to further promote the use of safer and more energy-efficient road lighting systems in China, since July 2006, the domestic authoritative research institute Fudan University Electric Light Source Research Institute has two roads for installing Philips warm white light system in Shanghai (漕溪北路And Qipu Road) conducted a one-year follow-up investigation and analysis. The results show that warm white light has significantly improved user safety and comfort. The actual measurement of the use unit also shows that in terms of energy saving, the warm white light has fully achieved the expected effect.
Comprehensive advantages of performance data
This study mainly tested facial recognition and color perception. Sample 1 uses a warm white light system of 140 watts on Tunxi North Road to compare the previously replaced 250 watt high pressure sodium lamp system. Sample 2 uses a warm white light system installed on Qipu Road and Zhengsu Road installed with a high-pressure sodium lamp system.
The results show that because of the higher color temperature and better color rendering of warm white light, people have better recognition ability under the same vertical illumination level; at the three distances of identifying gender, guessing identity and confirming identity, warm Under the white light, the absolute distance difference of 5m/3.5m/2.7m is achieved respectively, and the relative distance difference advantage of 0.7%/36.3%/47.6% is achieved.
In the color recognition of another test indicator: Warm white light is more abundant in the green spectrum and the blue part of the spectrum. In the red, yellow, and blue identification tests, warm white light is superior to high pressure sodium lamps. In most cases, warm white light increases color as the distance increases, such as yellow-green, yellow, etc.
In the first warm white road in western China - Chongqing Zhongshan Road, the results of the installation staff also showed that: in the illumination uniformity of important indicators affecting traffic safety, Zhongshan Road is under warm white light than under high pressure sodium lamp. Increased by 23%, and the average illumination is basically the same.
These data show that the warm white light system has excellent performance, stable and excellent performance in various detailed indicators, providing a solid foundation for meeting China's continuous improvement of road lighting quality.
90% user preference and over 40% energy savings
Road lighting is for pedestrians and drivers who are in it. Therefore, truly excellent products must withstand the user's personal inspection.
The results of the user survey conducted in the same period of the report are: people feel that warm white light is brighter and easier to identify objects, and nearly 90% think that it is better to recognize colors under warm white light; more than 90% prefer color temperature A lighting environment created by a warm white light system with a higher color rendering.
On the specific road section, the report selected Henan North Road using high-pressure sodium lamps and Qipu Road using warm white light as a comparison sample. The purpose of the questionnaire design was to understand their feelings and satisfaction with the two lighting systems. The results are close to the above data, and in terms of overall comfort, the warm white light of Qipu Road is far more than that of Henan North Road with a ratio of 92.3%.
According to theoretical calculations, if the road lighting is replaced by a warm white light system within 1000 km, the 30,000 sets of lamps can save 200 million yuan in electricity and save 300 million kWh per year. The measured energy saving ratio of Zhongshan 4th Road in Chongqing has reached more than 40%. After several months of investigation and analysis, under the premise of not reducing the lighting effect, as the main road of the traffic flow (ten lanes), the power consumption after the replacement has decreased by nearly 40%.
Philips warm white light road lighting system has been applied in Shanghai, Chongqing, Shenzhen, Nanjing, Chengdu, Guiyang, Tonghua and other places, and the report of Fudan University Electric Light Source Research Institute is timely, which will undoubtedly open up the vast road lighting market in China. The foreground adds a heavyweight weight.
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