Study on different ways of promoting LED street lamp in China and America

For the early failure reliability of LED street lamp products, we can only rely on the entry of products strictly. According to statistics released by the United States, in the acceptance of the technical certification of the selected products, about 30% of the candidate indicators can be achieved. In the candidate products, only 1/3 can really be adopted into the actual trial assessment, which is less than 10% of the products can be accepted to participate in the trial use. The final test selected only 2%.

Individual city due to unfamiliarity into products, strict examination and inspection of procurement, 2000 lamp fitting, in bad weather conditions found Jizhan early failure after all demolition, along with 25000 of the product is not installed, all returned to the supplier. Case in the League on the Internet, has attracted the attention of suppliers and the city, to promote the improvement of the future LED road promotion.

China has not yet been able to reflect the quality of the public platform to prevent poor quality products into the market and avoid duplication of errors.

Discussion on color temperature and color rendering

LED street lighting on the road to take what kind of color temperature problem, is still under discussion. From the experience of American urban streets, from the downtown area and the public safety of the street, tend to high color rendering index of white light. Help to identify a variety of objectives to facilitate the activities of the crowd.

However, the color temperature above 5000K can not be accepted. Traditional residential area, the outskirts of the road, in favor of the lower color temperature, feeling more comfortable and warm. On the outskirts of the vehicle speed is higher, advocate the use of warm colors. Initial trial installation of LED street lamps are relatively high color temperature, is currently exploring the possibility of color temperature down. The approximate range is between 3500-5000K.

Due to the one-sided emphasis on the light efficiency of lamps, many of the early installation of LED street lamp with high color temperature, color rendering is also low, the public is difficult to accept. At low color temperature. New York and Shanghai, two cities, called around 3500K night appropriate color temperature.

LED street light

LED road lighting returns one of the largest uncertainties, judging is life reliability of the lighting of the light. Light is a prescription to verify the parameters of lighting the actual use of the long-term tracking test is not realistic. But because of the difficulties and give up or relax on the product light requirements, will make a large number of cheap lamps on project acceptance, with the construction, resulting in project failure.

Method of controlling the light efficiency of the light is only accept street lamps with LM-80 and LED elements selected by LM-79 certification. The actual proof of certification in accordance with components of the product, at least 7 years decline is acceptable. Liaoning Avenue reconstruction in China after the Mianyang earthquake, using high-quality LED lighting, light years measured was 5.5%, and the current level is higher than the national average. Strict LED road lighting, will lead to the domestic LED element to pay more attention to product decay index.

Requirements for uniformity of LED road lighting

Public lighting in the United States is generally emphasized in the square lighting uniformity. Ordinary road lighting is more emphasis on the performance of lighting, emphasizing the importance of lighting, not the pursuit of highly uniform road lighting. The distance ratio of urban street lamp is generally higher than that of our country, which is generally more than 3. In the non residential area, the illuminance of road surface is low, and the distance is not 3. But in the intersection or residents in and out of place, are set to enhance lighting, lighting and warning to play a dual effect.

The latest research shows that light and shade road lighting is more in line with the human nature of the night lighting, but also improve the visual alertness. Uniform lighting environment is easy to produce visual fatigue, reduce the ability to recognize the target, is not conducive to driving safety. Moreover, it is not only difficult to use, but also has high cost, low lighting efficiency, and glare. Absolute is not worth the candle.

LED lighting project, the current situation of our country, because of the road illumination uniformity of easy detection, project acceptance and perception of convenience, obviously, the media publicity, so the uniformity in the LED lighting engineering design in our country is often too much emphasis on. Most of the demonstration projects in terms of uniformity are more than the prescribed standards, and regarded as the most prominent indicator. To this end, the use of ultra low aspect ratio greatly increased the cost of construction and operation. However, this newly built flashy bright project, not enough to become a model for the promotion of LED lighting applications, and eventually become a negative textbook.

New understanding of LED glare

LED road lighting application is the most important indicator of the new light produced by the light. A lot of threshold increment TI standard LED lighting design, still makes people feel obvious discomfort or even close to the glare of disability.

This is due to the use of a large area of the traditional reflector to achieve different, LED lamps are directly projected. Light emitting light in the area of small, every square meter of the surface brightness of tens of thousands of CD, thousands of times more than ordinary lamps. High resolution naked eye LED light source can be directly in the local retinular cells produce strong stimulation and not just the screen cover. The measurement method of set theory based on screen increment threshold standard TI and low space resolution is completely unable to distinguish between the visual difference.

For such a high brightness of the light source, the current recognition can only be resolved by means of light, and