Refute the high-pressure sodium lamp street into LED will become a disaster point of view

The day before, I read an article micro-blog Verizon Nico Technology Co. Ltd., lighting lighting system (Guangdong will all the lights changed to LED will be a disaster). As mentioned in this view, individuals feel biased, since willing to express their views, for your reference!

Energy saving problem

It is said that it is too arbitrary to challenge the company's installation of LED lamps to meet the requirements of road lighting standards, so that the conclusion is that it is necessary to save energy at the expense of illumination. It can be said that the installation of the LED lamp so much, most of them reached the road lighting requirements, the only difference is just such than how much, we can not believe that the LED lamp manufacturers, but not to believe that the area of the project quality inspection institutions, we can think of supervision in some areas is not enough, but not that all Chinese quality inspection agencies and all over the world are LED lamp manufacturers hand (Note: all over the world are equipped with LED lights, and a large number of more than 90% of all Chinese manufacturing). As for the high pressure sodium lamp light effect of 100-200lm/w, I really do not know which country or which planet technology. A common problem is that the optical efficiency of high pressure sodium lamp to 400 watts are the highest, only can do about 120-130lm/w, and the emphasis is efficient and lower than the high pressure sodium lamp, 400W products, light efficiency is lower than 110lm/w. According to the Shanghai street management chief engineer Mr. Wang Xiaoming introduced, at present the actual installation of high pressure sodium lamp, high pressure sodium lamp is less than 30%, so the actual use of high pressure sodium lamp. Most less than 100lm/W. Again, because of the high pressure sodium lamp 360 degree light characteristic coefficient is the effective use of pavement is very low, according to the current domestic design utilization coefficient, are between 0.4-0.6, that is to say, high pressure sodium lamp light effect the actual use of the road reached only in the 40lm/w- to 80lm between /w and LED, is due to unilateral light it is a new light source products, most close to the point light, two auxiliary in the secondary optical design is good, can be obtained by the relatively high rate of on the road, at present common product LED basic can achieve the optical efficiency of 120lm/w, the highest level of production can reach more than 140lm/w, according to 0.8 of the most conservative utilization coefficient. The road also effective light effect in more than 95lm/w. The future of LED light efficiency is still in progress, energy saving is still a problem?

Two, the ambient temperature is not controllable

In this article, the temperature of the cavity of the LED lamp is 100 degrees in the extreme case. From the current product data throughout the detection section, temperature rise of lamps are controlled at 30 degrees around the level, that is to say the lamp cavity temperature based on the ambient temperature plus 30 degrees, if the lamp cavity temperature as mentioned in this paper reached 100 degrees, that is to say to the environmental temperature the above 60 degrees, so that the environment, people are missing, but also light to do what? That is not some manufacturers of the products is cooling very poorly, although the nine years personally visited numerous manufacturers, but I can't jump off, but certainly, the vast majority of manufacturers in the heat treatment technology has been very mature, the heat treatment is not a the problem.

Three, through the fog

In this paper, it is pointed out that there is no one kind of light source which is better than the high pressure sodium lamp. I want to point out a common mistake, is the yellow light through the fog than white light, but green and red through the fog than the yellow light, which we look at the traffic lights and stop traffic mainly using green and red and yellow light, just a reminder and warning can know when. However, automobile brake light using the red one is it through the fog is good, but also because people are more sensitive to red. Therefore, the high-pressure sodium lamp is not the best permeability, because the current traffic lights are basically LED light source.

Of course, the yellow light fog is better than white light, this is a qualitative problem, but this is only qualitative, and not quantitative. That is to say, there is not given an actual number of levels to explain through the fog than white light through the fog is good to what extent the yellow light, more cannot give this fogpentrating difference much impact on the actual traffic situation, only by a qualitative break on the future traffic accident significantly upgrade, it is not too strict.

In fact, if in doubt, it is simple to solve, Guangzhou Avenue and Tianhe North Road installed LED lamps have been more than two years, looking for the traffic police department to compare before and after the accident, the conclusion is more objective!

Four, anti mosquito

There are mosquito phototaxis, is indeed a special wavelength, that is ultraviolet light in the wavelength range is divided into three kinds of 280-190nm, 315-280nm, 400-315nm, so we often see the lights are purple, and white LED is a kind of light, the wavelength in the range of 390-780nm, the composite light due to wavelength radiation weak, in a very short distance air is absorbed, so the mosquito attraction is not high, so we look at the fluorescent lamp of their own home, and the wavelength range of LED, to see whether there is a strong attraction to mosquitoes, and not to mention the street lamps installed in 6 meters the height above. If I get this wavelength move, LED lamp manufacturers in the lamps before the glass sprayed mosquito water, the effect should be good, this way also pulled mosquito water manufacturers market.

Five, will