Changing high-pressure sodium lamp street lights into LEDs can be a disaster?

First, energy saving issues

The article mentions that it is too arbitrary to question which company's installed LED luminaires meet the requirements of road lighting regulations, and conclude that it is to sacrifice illumination to achieve energy savings. It can be said that the installation of so many LED street lights throughout the country, most of them have met the requirements of road lighting specifications, the only difference is the question of how much energy saving ratio, we can not believe LED lighting manufacturers, but not not I believe that the quality inspection institutions of various projects in various regions, we can think that the supervision of some areas is not enough, but we do not think that the quality inspection institutions in China and the world are savage with LED lighting manufacturers (Note: installed around the world) A large number of LED street lights, and more than 90% are manufactured in China). As for the high-efficiency sodium lamp's luminous efficacy of 100-200 lm / w, I really do not know which country or which planet technology. A common-sense problem is that the current high-pressure sodium lamp has the highest light efficiency of 400 watts, and can only achieve 120-130 lm/w, and emphasizes high-efficiency high-pressure sodium lamps, while products with less than 400w have low luminous efficiency. At 110lm/w. According to the introduction of Mr. Wang Xiaoming, the chief engineer of Shanghai Street Lamp Management Institute, the proportion of high-efficiency high-pressure sodium lamps currently installed in domestic high-pressure sodium lamps is less than 30%. Therefore, the actual high-pressure sodium lighting effects currently used are mostly below 100lm/W. In addition, due to its 360-degree luminous characteristics, the high-pressure sodium lamp has a very low coefficient of effective utilization by the road surface. According to the current utilization coefficient of each design in the country, it is between 0.4 and 0.6, that is, the high-pressure sodium lamp arrives. The actual light effect of the road surface is only between 40lm/w and 80lm/w, and the LED is a single-side light source, and it is the new light source product closest to the point light source, supplemented by a good secondary optical design. The pavement has a relatively high utilization rate. At present, the common products of LED can basically achieve the light efficiency of 120lm/w, and the highest mass production grade can reach 140lm/w or more. According to the most conservative utilization factor of 0.8, the effective light of the road surface The effect is also above 95 lm/w. The light efficiency of LEDs is still improving in the future. Is energy saving still a problem?

Second, the ambient temperature is uncontrollable

It is mentioned in the article that the temperature inside the lamp cavity of the LED lamp reaches 100 degrees under extreme conditions, and I don't know where this data comes from. From the current product data detected by various places, the temperature rise of the luminaire is controlled at a level of about 30 degrees, that is, the temperature of the lamp cavity is increased by 30 degrees on the basis of the ambient temperature, if the lamp is as described in the text. The cavity temperature has reached 100 degrees, that is to say, the ambient temperature has reached 60 degrees or more. In such an environment, people are gone, what else should the lights do? As for whether some manufacturers' products are poorly cooled, although I have visited countless manufacturers in person for nine years, I dare not break the argument, but it is certain that most manufacturers are cooling this technology. Processing has been very mature, and hot processing is not a problem at all.

Third, fogging

It is mentioned in the text that no light source of any kind has a better fog permeability than a high pressure sodium lamp. I want to point out a common-sense mistake. It is that the haze of Huangguang is better than that of white light, but the fogging of green and red light is better than that of yellow light. This point is mainly seen when traffic lights pass and stop. Light and red light, while yellow light is only a reminder and warning effect can be known, of course, the car brake light with red light on the one hand is its good fog permeability, on the other hand because people are more sensitive to red light. Therefore, it is not the best fogging of high-pressure sodium lamps, because the current traffic lights are basically LED light sources.

Of course, the transparency of yellow light is definitely better than that of white light. This is a qualitative problem, but this is only qualitative and not quantitative. That is to say, there is currently no actual quantitative level to indicate how good the fogging of yellow light is better than the fogging of white light, and it is even more impossible to give the influence of this fogging difference on actual traffic conditions. How big is it, from a qualitative issue alone, it is not too rigorous to say that traffic accidents will increase significantly in the future.

In fact, if there is any doubt about this, it can be solved very simply. Guangzhou Avenue and Tianhe North Road have installed LED street lights for more than two years. Looking for the traffic police department to compare the accident ratio before and after, this conclusion is objective!

Fourth, anti-mosquito

Mosquitoes do have phototaxis, and they are indeed special wavelengths of light, that is, ultraviolet light, the wavelength range is divided into three kinds of 280-190nm, 315-280nm, 400-315nm, so we often see the mosquito lamp is purple LED white light is a kind of light, its wavelength range is 390-780nm, its composite ultraviolet light is weakened by wavelength, it is absorbed by air at a short distance, so its attraction to mosquitoes Not high, this point to observe the fluorescent lamp of your own home, the wavelength range is the same as that of the LED, to see if there is a strong attraction to mosquitoes, not to mention the street lamp installed at a height of more than 6 meters. If you don't take this wavelength, I would suggest that the LED lighting manufacturer should spray some anti-mosquito water on the glass cover before the factory leaves the factory. The effect should be good, which will also pull the market of anti-mosquito manufacturers.

V. Must consider the requirements for typhoon and earthquake prevention

I strongly agree with this point. The situation mentioned in the article is also a fact of actual existence. Moreover, most of the LED lamp manufacturers currently have no experience in the design and use of street lamps. The importance attached to this issue is far lower than that. Cooling, light distribution, energy-saving lamps, but the fact is that safety is more important than any performance, I hope that the industry will cause concern.

On the whole, the author disagrees with most of the opinions in the article of Ruisen Nico Lighting System Technology Co., Ltd., and it is too alarmist to conclude that the replacement of LED street lights in Guangdong will be a disaster.

As a new generation of light source, LED itself has the superiority that it is not available in discharge gas lamps. It can be said that as a new generation of mainstream light source, it is the trend to replace the discharge gas lamp, regardless of some people, some Whether these areas like it or not, the trend of technology development cannot be resisted! What we need to do is to adapt to the development of the trend, do a good job of guiding, do a good job in planning, strengthen the self-discipline of the industry, and respond to the development opportunities brought about by the new technological revolution with a positive attitude!