日期：2013年6月13日

LED lights design elements

LED lighting products for its energy saving, environmental protection and other characteristics, known as the real “human beings of light”, one time, LED road lighting has become the focus of a substantial number of large-scale corporate markets and capital in droves, LED application products in LED road lights product is the most difficult to do, most of the designers have emphasized that it is in a “systems engineering” comprehensive industry technology combination. There are requirements for road lighting designs of Arts and Sciences; has the particularity of the LED light source for a reasonable cooling technology; optics are suitable for road lighting with light of knowledge; has LED power of the “long-life” bottleneck, products truly energy requirements ….. Many manufacturers do not have the sufficient condition on the basis of blind imitation, they follow the established methods and procedures, no other reason, because “we all do” and “Everyone thinks should not have done.”

LED Street Lights
LED Street Lights

Let us work together to explore the current appearance of LED road lighting design
One.wind resistance requirements
Traditional street has taken great pains in shape, almost all streamlined design, in my opinion this design is not only just to look good, there is another important reason is that the impact of wind differentiation, that is, to reduce wind resistance. And today’s LED lights its own weight heavier than conventional lights and more, and almost all flat boxy shape, worse is commonly used in LED lights on the renovation project, that was originally installed conventional street light poles , and not through the direct replacement LED lights reinforcement. Taken together these three issues, security issues are worrisome. It is recommended that designers should consider in the design of wind resistance problems, so you can really stand the rain street.
Two.air convertion cooling channel
The importance of cooling of the LED lamps we all understand, but in the heat, but some manufacturers on the way into the errors. I have seen some manufacturers put LED mounted to the heat sink, and then loaded into the entire radiator shell conventional street lights, and some made directly after the LED light bulb in the form of integration, and then directly onto conventional street lights shell, lamp shell without any processing. Both methods are wrong. LED lamps scattered heat dissipation is ultimately put into the air, and the above two approaches just put heat into the lamp housing, lamp shell of the heat which in turn heats the luminous efficiency of the LED so reduce heat more so a vicious circle.

To solve the above problem is to a good air convection fixture passage, which is in the appropriate location on the luminaire vent the hot air to go out, the cold air can be advanced to such
This can greatly improve the cooling effect of the lamp. Figure 2 is developed by a team of my street. Lamp shell heated air through the vent cover in the outflow from the pressure difference causing cold air from the bottom vent and the gap between the modules to supplement it, thus forming convection channel
Three. Below 10 degree angle intuitive phenomenon
I had previously talked about a true story, it is because the wrong section of the road because of the light guide often caused by a certain road traffic accidents example that tells us that people with the street lighting functions should have good guidance, while This is precisely the issue ignored by many designers.
According to my investigation and research, found that LED lights installation angle is less than 10 °, its guiding role is not very good, I suggest that to meet the lighting requirements of the premise try to control more than 10 °, but not too large, because it is too large easily lead to excessive glare and there is not a reasonable portion of the light used.
Four. Combining local culture design
The many advantages of the LED, its compact “posture” the most suitable design, which is the conventional gas-discharge incomparable, we combine the surrounding environment and local cultures do, play lanterns during the day and night dual viewing fold effect, greatly increasing the added value of the lamp.

led street light introduction
led street light introduction

Five.Superior modular maintenance issues
LED often encounter a problem which has its own advantages – long life, maintenance brings, it is precisely this advantage take away the jobs of many people, but in fact in accordance with the current technology can not do to the maintenance-free, but because of the instability of the power, the light fades serious problems to the manufacturers so bring a heavy maintenance costs. Referred to safeguard it shows modular superiority. Modular is a plurality of LED integrated, made a standard module itself can solve heat, light, and IP protection and other issues, a lamp consists of several modules. Modular power not only to avoid the risk of high power, IP protection is easy to maintain it as easy to conventional street lights, greatly reducing the maintenance burden of enterprises, but also easy for the owners accepted, happy, why not. Figure 3 in the upper row of three lights and a lower row of lights are the first examples of modular design.
Six.Adjustable mounting angle
The adjustable mounting angle is the elevation angle of the installation of lighting within a certain range is adjusted as needed. Due to the current LED lights are basically used in the transformation process, are not-for-lamp replacement rod. The original poles are not tailored according to LED lights, jumping arm angle is not identical. Can not adjust the mounting angle of the lamp may be applied in this way, in another a road do not apply, so as to make lamps with better versatility, adjustable connector is a necessary condition, is a measure of the importance of light weight grade.

Rapid development of LED lighting products

Related businesses in recent years, and lighting and LED related basically, and we can see that LED lighting has become the trend of the future to achieve a consensus.
LED Outdoor Lighting also has LED lights and LED tunnel lights and LED landscape lights, LED lights which went mostly LED lights this year compared with previous years is much more mature.

LED Street Lights
LED Street Lights

LED lights with conventional monolithic majority, only emphasized its functional lighting, LED lights this year are basically modular design, but also reflects its maintainability. Many companies are still two years ago to promote its LED products, “long-life, maintenance-free”, perhaps after two years of testing and lessons discovered that did not imagine so “long-life, maintenance-free,” some of the industry should be grateful insight guide, chose modular, which is a big step forward, but a long way behind, because now modular still just stay in the “fragmented” stage, each one of the modules varies between different manufacturers do not have interchangeable modules, so now the “maintainable” is only limited in-house, and can not be extended to the entire industry. Industry needs some leading enterprises and industry standards to make standardized modules can talk about the real “maintainable”, LED lights also have a large area to promote universal condition.

LED Outdoor Lighting
LED Outdoor Lighting

LED outdoor lighting products have begun to focus on its exterior design, not just only emphasized illumination. Early one radiator plus a glass, no cover, power lighting products have been exposed to be eliminated, this year’s show a lot of LED lights have a cover, with a beautiful shape and good craftsmanship, attention to the taste. Really very pleased to see that my years as called for by the advantages of LED lights product concept, get some corporate identity and the realization of the product.
Progress in the past year can be described as a huge indoor lighting, remember last year when she was just LED tube lights and various cups main products are rich in a lot this year, office lighting and commercial lighting products is plentiful and innovative ideas, craft delicate, more There are big companies provide total lighting solutions rather than a simple product. Also noticed a few large international companies basically do not show LED outdoor lighting products, office and commercial lighting only, but the concept is novel, quite creative.
In our opinion, whether it is outdoor or indoor LED products, R & D personnel to make it clear to be selected to do the LED lighting products, not in school, you can imagine it, you need to understand the core technology of conventional lighting principles, cost and mass production, perception the truth in order to make a good LED lights.

How to control LED brightness

There are two ways to control LED brightness. One is to change the current flowing through the LED, the general LED tube permits continuous current at 20 mA or so, in addition to a saturation of the red LED, the other LED brightness is substantially proportional to the current flowing; Another way is to use the human visual inertia with a pulse width modulation method to achieve gray scale control, that is, periodically changing a light pulse width (i.e. duty cycle), as long as the repetition cycle of light is short enough (ie, refresh frequency is high enough), human eye do not feel luminescent pixel in jitter. Since the pulse width modulation is more suitable for digital control, the microcomputer to provide the universal LED display content Today, almost all of the LED display are controlled using pulse width modulation gradation.

led tube set

led tube set

LED control system usually consists of the main control box, scanning panels and display and control device has three major components. Main control box from the computer’s graphics card to get a screen pixel color luminance data, and then re-allocated to several blocks scan board, each board is responsible for controlling scanning LED screen on several rows (columns), and each row (column) on the LED display and control signals are transmitted with a serial manner. There are two serial transmission of display control signals: one is the central control panel scanning gray of each pixel, the scan board from the control box for each line of pixels brightness value decomposition (i.e. pulse width modulation), Then each row of LED turn signals in pulses (lit one, does not shine as 0) by line using serial transmission to the corresponding LED on the control whether the light. The use of fewer components, but the serial transmission data volume, because in a repeating cycle of light, each pixel in the 16 gray levels requires 16 pulses, the 256 gray levels required under 256 pulses, due to device operating frequency limit, generally only the LED screen to do 16 shades of gray.
Another method is to scan the contents of a serial transfer sheet is not a switch signal for each LED but an 8-bit binary brightness value. Each LED lighting has its own pulse width modulator to control the lighting time. Thus, in a repeating cycle of light, each pixel in the 16 gray scale requires only four pulses, 256 gray scale only eight pulses, greatly reducing the serial transmission frequency.

LED lighting products development direction

Currently, LED lighting technology matures, high-power LED lighting Products effect has reached 100lm / W or more, while the last two years many of the city street lighting energy saving, indoor and commercial lighting the rapid development of the situation, have proved semiconductor lighting to replace conventional lighting gradually become possible. LED lighting as a sunrise industry gave birth to the great business opportunities, many lighting companies in order to seize the valuable opportunity to seize more market, create more efficiency, are trying to develop a variety of LED lamps to meet the needs of users, and even some of the original does not produce lighting products have also launched LED lighting, lack of professional knowledge as lighting, lighting market research is not thorough, lighting business development there is no scientific and rational planning and lack of foresight on the future development of the industry, resulting in a current semiconductor lighting Product chaos. The Guangzhou Guangya Lighting Exhibition blowout phenomenon can be fully proved that the majority of enterprise products identical, and the lack of new ideas, and the cost price of the issue has exacerbated the limited market competition. The development of industrial chaos phenomenon, a lot of my colleagues are worried.

LED lighting
LED lighting products development direction

Today’s science and technology scientific contradictions restricting the normal development of industry, business investment be profitable, customer demand-oriented dislocation, Relationship Marketing, Government Executive consciousness does not correct guidance direction of industrial development, such as the market LED bean pot lamp , a combination of multiple LED light source lamp, nowadays some LED lamps, incandescent glow from some distance some of the LED bulbs, some non-standard LED lights, tunnel lights. They failed to correctly understand the conventional way of lighting and lighting requirements are unique, just Yihuhuhuapiao, according to the conventional lighting looks like making that same look is light, light is light, energy-saving lighting is the light. Indoor lighting are really asking is: According to the environmental requirements and standards of different places illumination, no strings light, no flash quite, soft and comfortable with a certain degree of illumination, (we should be concerned of conventional lighting light source emitting principle), We are also commonly referred to as mood lighting, scene lighting, (should be upgraded to mood lighting), today as a fourth-generation light sources revolutionary semiconductor lighting products LED, lighting can not only meet these requirements but also the best choice.
LED outdoor lighting products for more demanding outdoor environment, there are many uncertainties that affect the application of lighting products, so outdoor lighting is also the most difficult lighting products. Lighting is a complex system, which is composed by a whole lot of components, electronic components for demanding work environment, must be considered when making the work environment in a variety of factors in order to ensure lighting is not affected. Meanwhile, heat the necessity of structural design, reliability of power supply, lighting wind resistance requirements, scientific and reasonable light, to have artistic designs, etc. must all possess ornamental eventually produce to meet the requirements of different lighting fixtures.

The chinese LED tunnel lights potential market

As of the end of 2009 China’s existing rail tunnel of 6876, with a total length of 3,670 kilometers, is the world’s first; Chinese total number of 1782 highway tunnel, with a total length of 704 km, is the world’s largest country road tunnel. The past two years is still an annual growth rate of about 200 km. According to “Road Tunnel Ventilation Lighting Design Specification (JTJ026.1-1999)” estimates, tunnel lights installation spacing of 1.5 m, symmetrical installation, this methodology domestic traditional tunnel lights mounted lights about 6 million, the market capacity is about 12 billion yuan. According to an annual growth of 200 kilometers in length, tunnel lights for an annual increase of about 300,000, the new LED tunnel lights potential market size of 600 million. As of the end of 2009 Shanghai, Guizhou, Shaanxi, Jiangxi, Zhejiang, Yunnan, Chongqing, Anhui, Guangdong, Fujian, more than 10 provinces and cities have begun to apply or promote LED tunnel lights.

 

2009 of the LED tunnel lights market is concentrated nature of the market share, the top 10 companies account for about 70% market share. Light side, imported light LED Tunnel Light accounted for 90% of the market, including CREE, Philips, Osram and Taiwan Epistar accounted for almost half of the country. Next few years, LED tunnel lamp market dominated by a few companies the situation will continue, imported light will continue to occupy a major share of the market. But with the domestic high-power LED chips gradually expand the scale, the future, this situation is expected to improve, thereby reducing production costs.
2009 domestic LED tunnel lights market overall improvement in the technology, the price gradually declined, city of ten thousand and relevant government subsidy policy under the influence of other factors, sales and sales are reaching record highs. According GLII survey data show that the market scale reached 180 million yuan, compared to 4,000 million in 2008, an increase of over 300%; domestic LED tunnel lights sales of about 80,000 units, estimated 2010 shipments will exceed 12 million units, the market size is expected to exceed 300 million yuan.

LED Tunnel Lights
LED Tunnel Lights

According GLII statistics, as of the end of 2009 China’s existing rail tunnel of 6876, with a total length of 3,670 kilometers, is the world’s first; Chinese total number of 1782 highway tunnel, with a total length of 704 km, is the world’s largest country road tunnel . The past two years is still an annual growth rate of about 200 km. According to “Road Tunnel Ventilation Lighting Design Specification (JTJ026.1-1999)” estimates, tunnel lights installation spacing of 1.5 m, symmetrical installation, this methodology domestic traditional tunnel lights mounted lights about 6 million, the market capacity is about 12 billion yuan. According to an annual growth of 200 kilometers in length, tunnel lights for an annual increase of about 300,000, the new LED tunnel lights potential market size of 600 million. As of the end of 2009 Shanghai, Guizhou, Shaanxi, Jiangxi, Zhejiang, Yunnan, Chongqing, Anhui, Guangdong, Fujian, more than 10 provinces and cities have begun to apply or promote LED tunnel lights.
2009 of the LED tunnel lights market is concentrated nature of the market share, the top 10 companies account for about 70% market share. Light side, imported light LED Tunnel Light accounted for 90% of the market, including CREE, Philips, Osram and Taiwan Epistar accounted for almost half of the country. Next few years, LED tunnel lamp market dominated by a few companies the situation will continue, imported light will continue to occupy a major share of the market. But with the domestic high-power LED chips gradually expand the scale, the future, this situation is expected to improve, thereby reducing production costs.
2009 domestic LED tunnel lights market overall improvement in the technology, the price gradually declined, city of ten thousand and relevant government subsidy policy under the influence of other factors, sales and sales are reaching record highs. According GLII survey data show that the market scale reached 180 million yuan, compared to 4,000 million in 2008, an increase of over 300%; domestic LED tunnel lights sales of about 80,000 units, estimated 2010 shipments will exceed 12 million units, the market size is expected to exceed 300 million yuan.