With the maturity of the LED-light source of the lighting level in the material technology, manufacturing technology and application technology, some days later, based on the increasingly serious environmental degradation problem, the economic development is disorderly, and the pressure of energy saving and emission reduction in the world is huge. The lighting application has finally been blown up. The reason for the explosion is not because of the excellent light emitted by LEDs, but because of the energy-saving nature of LEDs. Based on this, government policy guidance, media pushes, investment inflows, and The related unrelated manufacturing enterprises have been involved in the timely transition, regardless of whether the technology is feasible, whether the capacity is sufficient, and whether the conditions are available. After a few years, LEDs are directed at the energy conservation of LEDs and supported by the national industrial policy. The strategic emerging industry is the grandeur of the city and the layout of the site.
However, for the sake of energy saving of LEDs, who has seriously cared about the light quality in LED application technology?
Well, the country said that LED energy conservation should be promoted, national policies are being done, and the death time of traditional incandescent lamps is set. The road map is also very clear and clear. According to the plan, it is hoped that the "energy-consuming" incandescent lighting will be allowed. Located in LED lighting, it also takes out the road lighting part of all cities. As an "experimental" shooting range for LED lighting applications, you believe that LEDs are vast and the prospects are optimistic, so they are constantly pouring into "energy saving". LED lamps neglect to do "light"! Look at all the urban roads that have been installed with LED street lights as of 2014, what is the light quality?
Light parameter part
Indicators such as light distribution and glare index control were seriously ignored by many LED manufacturers before 2013, and they pursued brightness and illumination.
The glare index control imposes strict requirements on LED street lamps. It is a difficult contradiction for LED manufacturers to design and illuminate the lighting. For example, the glare generated by the 120-degree illuminating angle and the 140-degree illuminating angle must not be Same day. The owner of the municipal department also believes that LED street lights with wide LED illumination can reduce the number of poles per kilometer. This demand is real, but there are also contradictions in application. Perhaps this problem is still pending.
The choice of lens materials is not a good idea for LED street lamps for road lighting! For a variety of different environments, wear, high temperature, anti-aging, deterioration, anti-pollution, etc., also cause problems in the application process. Problems such as light breakage and light color change.
For the application of LED, there are still many problems. For example, if the blue light of the LED is mixed with the yellow phosphor, white light is obtained, and the red light is absent in the spectrum. Whether the LED light is blue or not is long-term activity in such an environment. Under, is it harmful to people? The color temperature deviation, redness, greenishness, etc. caused by process reasons and material quality reasons also need to be engaged in LED application technology to stop the continuous improvement of technical ideas for low-cost service, return to artisans Mentality, light, and satisfying applications.
For the development of the LED industry, industry industry Cai Ming believes that everything is listed in the national strategic industry is basically very miserable, everyone on the wind, first fight the concept war, mature and then fight the price war, the winner is to get the government Subsidized and mixed LEDs. At that time, when Qinshang Optoelectronics reached the lighting level, he instantly subverted his knowledge of semiconductor light-emitting diodes. At that time, he had the desire and impulse to kneel down to the LEDs, and fell in love with LEDs, falling in love with LEDs. All applications, of course, did not know the LEDs that entered the state of strategic emerging industries, and what subversive effects (or consequences) would it produce?
From the original application state, or from the basic business start-up phase, the perception of LED application changes. At that time, in order to promote LED, local policies and national policies have introduced “special subsidies for science and technology” projects.
There are two reasons for this:
The first is to use the means of policy and subsidy support to promote LED applications;
The second is to dilute the price of LED lamps at that time.
Its representative policies include: high-tech special subsidies, ten cities, ten thousand stores, and other technology applications.
At that time, all subsidies and support policies introduced at the national and local levels were centered around the so-called national policy of “energy saving and emission reduction”. Thus, the madness of LEDs makes people crazy from the above favorable factors. This kind of madness is not necessarily directed at energy conservation and emission reduction. It is directed at the support of national policies. It is because of this madness and the energy saving effect of LEDs. Is it really like propaganda?
In fact, it is not the case! LED energy-saving ratio of traditional lamps, there is absolutely no more than 65% of the most publicity. At this time, the country’s favorable policy for LEDs is crazy. The first thing is to let LED manufacturers cover up and ignore the authenticity of LED energy-saving technology. This is what I want to say. Under the “call” of the policy, LED people Let the LED appear "misunderstanding" for the first time in the application direction, or "misguided"
In the business model, LEDs are used in contract energy management projects (EMC). As for the success of the project performance, does the contract energy management project engaged in lighting energy conservation achieve corresponding economic benefits?
As mentioned above, when everyone thinks that the LED world is vast and the prospects are optimistic, they are constantly pouring into the "energy-saving" LED lamps and neglecting to do "light"! No attention is paid to the quality of light, how many unprofessional people in the LED manufacturing industry Doing unprofessional products!
I remember, Zhang Haiwei Zhang asked the light source of the package: After each round of application, has the LED lamp been successful?
Yes, it seems to be successful! Look at the overwhelming LED, look at the number of application growth, accompanied by the policy means, succeeded...
However, the successful LED I am half a LED powder, the person installed the LED lights again, and removed again.
The reason is the feeling, the feeling of light, the professional point is light sense!
I have been fed up with LED light in the office during the day. I feel very nervous when I return home. Maybe LED is involved in the blue, and when I communicate with Raymond Zhang, I have found the answer to the sensitivity of LED: LED light Part of it is the lack of red light, which seriously affects the saturation of light, so my long-term opposition to LED light, my tension will start.
So, is this light quality in the first round of applications, have engineers paid attention to it?
In fact, everyone knows very well that the LED industry is a “freak” industry. From the perspective of the industry, there is a situation of cooperation and competition. Because the packaging is ready to extend downstream to the lamps, the kits may become powerful in the industry at any time. a member.
Another industry fact is that you have the subversive technology on hand, it is useless, the application point has not yet reached this point, and there is no scale application that affects the LED plate.
For example, if the long-distance lighting used the power supply scheme of “resistance-resistance and step-down” a few years ago, it became a laughing stock in the industry after the quality accident, so now, is there anyone who dares to laugh at this application?
Years ago, Dongguan Shilong and Shi Pai took the lead in using the subsidy policy to implement LED street lights. At that time, they drove from time to time to the two towns to see the LED lights. The feeling of walking like the moon was very satisfying, but after half a year later. I feel that the lights on some sections of the two towns are green at the edge and green as time goes by.
At that time, I was joking that the LED that emits green light is green lighting, but the joke is a joke. From the perspective of application technology, is it doubtful that the white LED technology that emits the yellow phosphor of the blue LED chip is reliable?
With the termination of the “Guangdong Province Promotional Use of LED Application Program” in 2013, the project implemented under the contract energy management model has gradually ended. On a late night night in 14 years, I drove on the streets of Shenzhen. I remember that I wandered for more than two hours. When I returned to the hotel, I found that the lighting in the lobby or the lighting in the room was dim. That was because the first stage of the application of the LED street light, the glare control of one of the products defect technology was not satisfactory.
So I have "a large angle of light based on the pressure of the owner and exaggerating the LED can save the number of street light poles per kilometer", we have done a large angle of light, but there is no way to control the glare
At that time, the model section of the so-called "the brighter and better" COB street lamp in a section of the Zhongshan Torch Development Zone was evaluated. It was found that in the bright white lighting environment, the people coming from the second light floated like paper. It is also a catastrophe, and the light-emitting characteristics of LEDs do not have a good light distribution, which makes me live. That is to say, one of the problems that the first round of application problems did not solve was glare control.
Optical material
About PMMA, an optical grade light-transmitting material used in all our LED lamps, is definitely not a good idea for outdoor lighting products. No matter how advanced your technology is, how strong it is, it is resistant to UV, heat, ageing and sand. Acid-resistant pollution has been useless for a period of time. Many years ago, an application test was conducted near the Flame Mountain in Xinjiang. The wind and sand were blown for a long time. Congratulations, this kind of use environment would definitely create a sandblasting effect on the lens. It does not cost, but in the application of LED lamps, this effect makes the LED produce a kind of "light loss" like light decay.
After the hot summer sun exposure, the LED street light body is aluminum alloy. When the ambient temperature is 50 degrees, the temperature of the aluminum alloy lamp body is more than 70 degrees. The lens starts to soften under this temperature condition, and then the wind A blow, a long cycle of reciprocation, a period of time to see the street light, where can still see the original look of the lens? It is like a tears hanging with the wind, has a strong directivity, then looked blue.
So every time I encounter an optical tutor, I ask this question: Can an optical lens use glass?
The answer is not satisfactory, either that the light transmittance of the glass is low, or that the light distribution is difficult... Is that true?
Chen Bingquan thinks that since the upper, middle, lower and surrounding parts of LED can form an industry, the lens material can also be made of glass. However, the rapid success of the application technology has made PMMA a material that cannot be separated from LED lamps. Now vacuum forming and purification Technology can make glass the king of optical materials.
When it comes to optical lenses, industry industry Tong Yuzhen believes that the use of glass for optical lenses is certainly the best choice. It has hardness, good light transmission, no water absorption and strong corrosion resistance. However, in the preparation of the connected lens, there are indeed processing difficulties. However, PMMA is much easier to process than glass.
In addition, industry industry person Chen Yuming also said that there is already an optical glass technology for the headlights of the car, and the lens can think in this direction. In this regard, Cai Ming believes that the asymmetric light distribution of street lamps is more difficult to do, the yield is low, and the latter is polished, and the cost limit is too low. Before looking for the manufacturer of the auto glass, but did not come up, and later found a professional LED glass lens manufacturer with 10 years of experience.
Let the application return, it is inseparable from the efforts of LED technology to research the ground gas, so that the LED products in the "big lighting" family return to the ultimate lighting.
