Interpretation of China's LED road lighting market

Since 2008, the number of urban road lighting fixtures in mainland China has developed rapidly. According to data released by the National Bureau of Statistics, the average annual increase in 2008-2011 was 1.39 million baht. As of the end of 2011, the number of urban road lighting fixtures in mainland China reached 19.49 million, with a compound annual growth rate of 8.9%. In 2014, China's LED outdoor functional lighting market reached 14.7 billion yuan, a year-on-year increase of 22%.

2010-2014 China LED outdoor lighting industry output value scale and growth rate (unit: 100 million yuan,%)

In 2014, LED outdoor lighting showed the following three characteristics: the rapid decline in prices, the slowdown in domestic installations, and the rapid growth of the export market. Of course, there must be a cause for this, and the emergence of this phenomenon has a certain relationship with all aspects. First of all, LED technology is further improved, and the problems of heat dissipation, light decay, and power supply that plague LED outdoor functional lighting are further solved. At the same time, the rapid decline in the price of upstream chips has improved the cost performance of LED outdoor functional lighting products. Second, the government has promoted the accelerated promotion of LED outdoor functional lighting products. Local governments hope to achieve energy conservation and emission reduction by installing LED street lights and LED garden lights, and at the same time achieve good social benefits. In addition, the price of LED outdoor functional lighting products continued to decline, but as the price of raw materials also fell simultaneously, the gross profit margin of LED outdoor functional lighting did not significantly decrease.

Road lighting culture customization can express urban personality

A design manager at the Tsinghua Conley Urban Lighting Research and Design Institute in Shandong Province shared the views of Professor Li Daixiong from Sichuan on the Customization of Road Lighting Culture. The so-called road lighting culture customization, as the name suggests, refers to the collection of lighting facilities for urban specific roads, consciously collecting the core content and typical expressions of local culture, using professional art design and processing techniques, through the overall appearance of road lamps. , color matching and material selection give accurate expression and expression. Customized road lighting fixtures (including lamp holders, lamp arms and light poles), or a unique embodiment of a new local unique culture, unique and exclusive, so the cultural customization of road lighting can express the unique personality, value and Image.

It is reported that the customization of road lighting culture is also very important to the city. First of all, it expresses the value and image of the city by the difference of regional culture, and shapes and enhances the image of the city from the cultural level. Secondly, it can effectively improve the satisfaction of the public's psychological and emotional needs. When excavating and applying these cultures, the public can obtain and enhance cultural pride from the municipal facilities, and form and improve the sense of belonging to the city. Third, it also symbolizes the degree of development of urban civilization.

Yuhua further elaborates on the five principles of road culture customization: 1. The practicality of road lighting facilities (as a basic municipal facility, it must have real, complete and obvious value, but also in line with “green lighting” and “sustainable 2. The concept of development; 2. Aesthetics (harmonious shape and beautiful form are essential); 3. Spirituality (a successful road lighting culture product for artistic processing based on full understanding of local cultural elements); 4. Sociality (should help the public to form cultural self-confidence, group identity and status awareness, and form a sense of pride and belonging to the city in which they live); 5. Coordination (ie, taking into account the lighting facilities themselves) Functionality and aesthetics should also use the concept of the system to grasp the overall coordination of the styling, color and volume of the luminaire with the environment, that is, the custom luminaire should be related to the nature of the environment, the road structure and the state of the street tree, the surrounding building volume and lighting. The integration of factors such as the status quo).

In recent years, LED has developed rapidly as an efficient and low-cost emerging light source. Many people in the industry have conducted research and exploration on LED replacement of high-pressure sodium lamps. The design director of Wuyun Lighting Design (Shanghai) Co., Ltd. said that the purpose of road lighting is to provide good visual conditions for motor vehicle drivers at night. This includes timely detection of the presence of obstacles on the road, understanding the extreme movements or trends of the contours of the obstacles, keeping abreast of the roads and their facilities, and maintaining a certain level of comfort during driving.

At the same time, the requirements for the quality of road lighting in "Standards for Urban Road Lighting Design" mainly include: evaluation indicators of visual function, including road surface average brightness Lav (or road surface average illumination Eav), road surface brightness uniformity U0 (or road surface illumination total) Uniformity E0), threshold increment TI, and the like.

1. The average brightness of the road surface is calculated by the following formula: Lav=1/n∑Li

Where, Lav - the average brightness of the road surface (cd / m2);

N—measures the number of points; Li—the brightness value measured at the ith measurement point.

The average road surface brightness Lav can also be measured directly using a dedicated imaging luminance meter.

2. Measurement and calculation formula of longitudinal uniformity of road surface brightness: UL=L'min/L'max

After finding the UL of each lane, compare them to find the smallest one, which is the longitudinal uniformity of the brightness of the entire road surface.

3. The calculation formula of the average illuminance of the central method: Eav=1/MN∑Ei

Where Eav—average illuminance (lx); M—the number of grids divided in the longitudinal direction of the road segment;

N—the number of grids divided in the horizontal direction of the road section; Ei—the illuminance value (lx) measured at the i-th measuring point.

In addition, there are evaluation indicators for comfort, including road surface brightness uniformity UL, glare value, and so on. Other indicators include environmental ratio SR, visual inducibility, and lighting power density.