LED street light energy saving

Recently, an article entitled "LED street lamp installation cost is too high, ten cities and thousands of Kunming were rejected" was uploaded on the website. The article quoted Xinhua News Agency as saying that "China has promoted and applied more than 1.6 million baht in 21 pilot cities. All kinds of LED lamps have an annual power saving of more than 164 million kWh." But since then, the article has produced a misleading result with a very unscientific algorithm: the national 1.6 million 盏 led street lamps need to spend 4.8 billion more than ordinary street lamps. Yuan, in this calculation, it takes about 60 years to recover the cost. There are problems in this article from the premise to the conclusion. Not only do you steal the column, but the information is inaccurate, and its conclusions are against the trend, which will mislead people's views on the emerging industry of semiconductor lighting.

The first thing to point out is that the Xinhua News Agency quoted in the article is very clear that it is "1.6 million 各类 or more LED lamps", not 1.6 million 盏 LED street lamps. In April 2009, the “Ten Cities and Ten Thousand Miles” pilot demonstration application project organized by the Ministry of Science and Technology was launched, which also clearly indicated that the pilot demonstration is not only LED street lights for road lighting, but also public places such as tunnels, subway car platforms, underground parking lots, gas stations, etc. Lighting, including indoor lighting, landscape lighting, etc. It is understood that at present, LED street lights installed in 21 pilot cities are about 200,000 baht, tunnel lights are about 20,000 baht, and indoor applications are about 660,000 baht. In addition, the landscape lighting application lighting is about 720,000 baht.

Followed by the energy-saving effect and cost of LED street lights. Take the 150W LED street lamp that is more commonly mentioned at present instead of the 250W high-pressure sodium lamp. If it is open for 10 hours every day, the electricity fee will be 365 degrees per year (0.1kw×10 hours×365 per LED street lamp according to the standard of 0.8 yuan/degree. Day), saving electricity costs 292 yuan (365 degrees × 0.8 yuan). The annual output of 200,000 LED street lights is about 73 million degrees (200,000 × 365 degrees), saving electricity costs of 58.4 million yuan (7300 degrees × 0.8 yuan). According to the high gap, the LED street light is higher than the high-pressure sodium lamp by 3,000 yuan. The 200,000-inch LED street lamp costs 600 million yuan, and the cost is recovered in about 10 years.

200,000 LED street lights, 10 years to recover the cost, looks very long, but this is only a hypothetical calculation, industry experts said that the calculation of energy saving should consider the actual power consumption of the lamps, in addition, the current electricity prices vary from place to place, energy saving effect Different, can not be generalized, for example, the text pointed out that Kunming electricity price is 0.483 yuan / kWh, which belongs to the lower electricity price, the electricity price in Guangzhou, Shanghai and other places is generally around 0.8-1.0 yuan / kWh, the peak electricity price will be higher. In terms of cost, the gap between LED street lamps and traditional street lamps is shrinking, and the payback period is continuously shortening. According to industry insiders, the current 150W LED street lamp replaces the 250W high-pressure sodium lamp, and it is estimated that the cost can be recovered in three years. In addition, with the advancement of technology, the performance of LED street lamps is constantly improving, and energy-saving efficiency is also constantly improving. Moreover, many places in China are actively exploring application modes such as EMC, which may help solve high-cost problems.

In addition to the contribution of power saving, the contribution of LED to environmental protection and emission reduction should not be ignored. According to statistics, saving 1 degree of electricity = reducing 0.997 kilograms of carbon dioxide, saving 1 kilogram of standard coal = reducing 2.493 kilograms of carbon dioxide. According to the "currently more than 1.6 million LED lamps, the annual electricity saving is more than 164 million degrees", the annual emission can be reduced by 164 million kilograms of carbon dioxide, equivalent to saving 65.78 million kilograms of standard coal. Assuming that the solar energy of 200,000 LED street lamps is about 73 million kWh, the annual carbon dioxide emissions can be reduced by 72.78 million kilograms, equivalent to saving 29.19 million kilograms of standard coal. Today, energy conservation and emission reduction is a global trend. China is currently in an important period of energy conservation and emission reduction. The energy conservation of LED lighting is of great significance for China to achieve sustainable energy conservation and emission reduction. scientific.

In fact, whether it is calculating the electricity cost saved by LED street lamps or calculating its cost, the bottom line is how to treat LED street lamps and their applications. For the energy saving of LED street lamps, industry experts said that the LED light source has many advantages such as green environmental protection, and the energy saving measurement of LED street lamps should be considered comprehensively, instead of simply comparing the recent cost of LED street lamps. For example, semiconductor lighting has color temperature controllability, which can make the visual effect of road lighting more scientific and reasonable. LED street light can effectively control the range of light, and has the superiority of effective average illumination. In addition, compared with the life of the LED street lamp, the traditional street lamp has the problem of replacement and maintenance of the light source electrical system, and the calculation cost is also considerable.

It can be seen that LED street lights are indeed higher than traditional street lights from the initial cost, but in combination with various factors, LED street lights have advantages in the long run. Of course, it cannot be denied that LED street lights are still in the technical development stage. There are many problems to be solved, and they are not very mature. At present, they are gradually advanced according to the steps of piloting and demonstrating. For the current pilot demonstration, industry insiders said that the pilot application will help identify problems, improve problems, promote the improvement of LED lighting technology, continuously improve the quality of LED street lamps, and promote the development of the semiconductor lighting industry, which promotes the core of the industry with the Ministry of Science and Technology. The improvement of technology R&D and innovation capabilities and the promotion of the overall competitiveness of China's semiconductor lighting industry are consistent.

At present, semiconductor lighting is the development trend of future lighting. It has become a consensus. The development of the domestic semiconductor lighting industry has made great progress today, and the support at the national level is constantly increasing, such as the “Twelfth Five-Year” National Science and Technology Support Program. The 863 program has related projects for semiconductor lighting, and the public's awareness of LED lighting energy conservation is also increasing. Under such circumstances, this article steals the concept, exaggerates the cost and recovery period of LED street lamps, and leads people to discuss that the LED street lamp value is not worthy of trial. It is inevitable that there is speculation, and the conclusion is actually the pilot project of “Ten Cities and Ten Thousand Miles”. Negative development, written intentions are also questionable.

As an emerging industry, the semiconductor lighting industry will inevitably have various problems in the development process. As a media, it has the responsibility and obligation to objectively and objectively reflect the development of the industry and guide people to correctly view the semiconductor lighting industry. Instead of partiality and even misleading public opinion, this is not only the unfairness of the development of the semi-industry, but also the damage to the people's right to know and irresponsible behavior.

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