Talking about the design and key elements of LED street lamps

In recent years, the development of various types of LED street light products has flourished in the three places of the two sides. Especially in 2008, Taiwan and the mainland have planned many engineering projects for LED demonstration roads, which injected the driving force for technology to continue to grow in the LED industry.

From the luminous efficiency of LED street lamps 45Lm/W in 2008, the manufacturers have publicly announced the lighting level with 80Lm/W luminous efficiency at the end of 2009. Regardless of the quality of this 80lm/W luminous efficiency product, can it be announced at the end of 2008? The standard requirements of CNS15233, but also because the governments of the government to expand the timely support of domestic demand, let the LED lighting products' luminous efficiency in all walks of life advanced, enter the LED street lamp industry, which makes the research and development energy greatly improved, I believe in In the near future, the luminous efficiency of LED street lamps can be improved to replace traditional street lamps in the form of current high-pressure sodium lamps.

LED street light heat treatment

At present, all LED street lamp products can be roughly classified into an aluminum extrusion heat dissipating processor, a fin type heat dissipating processor and a heat pipe combined heat dissipating processor in the design of the heat dissipating processor, and among them, the aluminum extruded heat dissipating processor is mostly The processor is exposed to the appearance of the luminaire. The advantage of this method is that the cost of the heat dissipating processor can be relatively low, especially the development cost of the mold is more competitive, but in the development of high wattage products, the weight is a must pay attention to The factor, because the public light pole has a certain limit on the stress, so in the high wattage products, it is generally used finned heat sink treatment, or the application of heat pipe design Heat treatment device.

Technical threshold for LED street light quality

In addition to the development of thermal processors, another important role in the structure of LED street lights is the power supply, because the current LED products are lit by DC drive, so manufacturers must customize on the power supply. The company develops exclusive power supply for all types of LED street light products, and also adjusts the circuit according to different parts of national product safety regulations to meet the safety regulations of products sold around the world. We have seen from the experience of LED streetlight engineering projects in the three places on the two sides of the strait in recent years that the proportion of dead lights in LED street lamps is mostly caused by the instability of the power supply, so the stability of the power supply will also affect the product. When the LED street lamp is used outdoors, it can maintain good light decay control within three years.

The optical design of the LED street light is also the cover door

Secondly, the important technical threshold for the development of LED street lamps in product development is the ability of optical design. Because of the good light distribution characteristics of LED lamps, the LED road light lines can be effectively distributed on the surface of the road to be illuminated. Currently, the NS15233 standard specification in Taiwan only Glare quality requirements of less than 30 and 10 are required for street lights at vertical and 90 degree angles. In addition, the horizontal 65 ~ 95 degree angle, also need to have greater than the specific brightness limit requirements, the remaining lighting technology, depending on the optical design capabilities of each product, because some engineering projects will require the road surface illuminance level limit At this time, the good optical design can make the LED street light products with slightly poor light output efficiency, and the actual illumination level on the road surface is better.

Therefore, in the condition that the quality and reliability are no problem, the LED street lamp competition looks at the remaining soft lighting performance. Most of the current LED street lamp products use the German battalion OSRAM for the batwing wide-angle dichroism of the street lamp products. Light distribution design, but in the design of light distribution, each manufacturer still has its own flaws, and it is not necessarily all-inclusive. It is still possible to continue to make efforts to improve the road lighting efficiency of street lamps.

Countries continue to introduce LED street light standards

At present, the national standards for LED street lamps in Taiwan, the three countries have been announced in December 2008, and the domestic street lamp standards are currently published in all provinces and regions, and the relevant product performance tests vary from place to place. The national standard for LED street lights should be announced in the near future, and this national standard should be in line with the CNS national standards established by the mainland and Taiwanese countries, so that the LED street light products in the three places will be stable in quality. Level.

As for the LED standards in Europe and the United States, there are also requirements for specifying the angle of light, quality and light decay. With the technological progress of LED streetlight products, we believe that more and better LED street lamps will come out and attract more public departments. Purchasing the standard to improve the visibility of the overall market of LED street lamps.

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