Shenzhen lamp Bureau Wu Chunhai: LED street lamp color temperature is critical

From Shenzhen City Light Environmental Management Center Mr. Wu Chunhai in September 6 - 7 days in 2009LED lighting technology and Development Forum "thinking and choosing LED lamp color temperature" wonderful speech, photoelectric news network for the whole tracking reports. Look at the LED street lighting from the point of view, the main light effect, light distribution, light, color (color) and other four major problems. In recent years, with the rapid development of LED street lamp technology, the optical performance is improved rapidly. From the test results we recently organized LED street view, there are 27 LED street lamp 6 light effect is more than 70Lm/W, up to 81.5Lm/W; the light distribution level is greatly improved, compared with the uniformity of high pressure sodium lamp has the advantage; attenuation problem is obviously improved, compared to other light sources and inferior. In this context, the issue of color temperature began to rise, rising as one of the main contradictions LED street lamps, the industry has become the focus of recent attention. Indeed, the street lights are the city's night light dimming division, its color temperature determines the night background, and the people's daily lives are closely related. Therefore, the LED street lamp color temperature problem in the scale of the application before the urgent need to solve, or it may become a huge obstacle to the promotion. At present, this situation has emerged in some cities, will also be achieved in more cities. By analyzing the physiological and psychological attributes of color temperature, Wu Chunhai discusses the relationship between the color temperature and the brightness (photo) and comfort, and puts forward the appropriate color temperature range according to the current technical level with LED street lamp test. Consider a: LED street lamp color temperature should be the side of the rebirth of rational or psychological? As a new light source, the LED street lamp is inevitably compared with the existing mainstream lighting, especially the high pressure sodium lamp. LED Street supporters believe that the high color temperature white light for road lighting with visual effect, good visibility, feeling more bright yellow light than low color temperature; high pressure sodium lamp supporters that yellow light through the fog is good, warm feeling, more popular than white. The above argument, has its own logic and reason, but also a certain degree of rationality. However, only the comparison of the advantages and disadvantages of different color temperature comparison, and can not find out the main contradiction in the face color temperature of LED street lamps, to solve the problem does not help, the promotion and application of helpless LED street lamp. Therefore, Mr. Wu Chunhai put forward to study the color temperature from the angle of property. There is no doubt that the color temperature has two properties of physiology and psychology, some indicators are inseparable. For example, through the fog effect identification of the driver's ability and reaction speed of light, which belongs to the physiological; at the same time, fogpentrating capacity errand driver feel hazy, the spirit of high tension, which belongs to the psychological. However, from the research point of view, we need to be treated separately, the indicators, methods, content, etc., to find out the LED street lamp color temperature in the scale of the most urgent need to solve the problem. See from the table, including the research of physiological visibility, identification and other indicators, scientists need to get through the careful design of the experiment; research mainly includes the psychological comfort and satisfaction, the need for a sufficient number of public scene investigation and questionnaire. Physiological research based on professional judgment, the right to speak in the hands of scientists, because LED street lamp can be used for road lighting is the industry consensus, it will not become a barrier to scale promotion. The psychological research is different, the result depends on the general public's subjective feelings, because the LED street lights will change the city night both "background", the public acceptance is very important. Therefore, before the scale promotion, psychological research is more urgent than physiological research. At present, there are many people on the city to accept the low degree white refused to high temperature LED lamp, so that the industry is in a dilemma in the light effect and color temperature selection of LED lamp, light color temperature should be priority or priority.

Thinking two: LED street lamp is not suitable for road lighting? Now a number of street lamp units expressed preference for yellow light, there are some experts and research institutions that the Chinese people like the warm white light 3000-4000K, more LED street lamp companies think that white light is very good. Opinions vary. Here, it is necessary to review a repeated case: in 1999, an international brand promotion in the domestic metal halide lamp, including many Shenzhen main road, Shennan Road, have replaced the white metal halide lamp (6000-6500K). At the beginning of the effect is quite good, but after 2000 began to have good times don't last long, public complaints, 2001 complaints in 2002, reached the peak, reflecting white light dim, not feeling well. Since then, Shenzhen's main road gradually switched back to the Yellow high-pressure sodium lamp. At the same time this scene, also staged in other cities. As a witness, I agree with the fact, but do not agree with the case was interpreted as Shenzhen people do not like white light and even Chinese people do not like white light. Because there is no public complaints when installed, the complaint appeared in a year later, in two to three years up to. According to the road surface survey data after the complaint, the serious decline of the metal halide light, bright (photo) significantly decreased, the asphalt pavement illumination is only about 10Lx. Therefore, the white light in the road lighting is not acceptable, may not only be high color temperature, but in the high color temperature and low light (shine) degree of common role. According to the interpretation of the figure, just installed light (shine) is higher, still in the comfort zone, will not feel dim. Unfortunately, the metal halide light decay, a year after the bright (photo) decreased, fell to the dark zone, complaints. Based on the complexity of psychological experience, no scientific investigation and adequate sample, can not be simplified