Use of lighting performance characteristics of the object itself, it can be natural objects or scenic spots, it can be ancient buildings or modern buildings.
LED lights how to show characteristics of the building
Monumental architecture: monumental architecture are some of the artistic, aesthetic features of the building, such as Buckingham Palace in London, France Arc de Triomphe and the Eiffel Tower, the Statue of Liberty in New York and Beijing bronze statue of Chairman Mao Memorial Hall, People’s Heroes Monument, Great Hall, etc., night lighting so that they, too majestic.
Neighborhood: main plaza surrounding the pavement lighting, showcase lighting, advertisement sign lighting and street lighting integrated static and dynamic combination of shapes, three-dimensional staggered, colorful, have shown a bustling scene, thereby increasing vitality .
Art View: Landscape Art based on a variety of raw materials or materials created objects, there are purely decorative role, such as statues, reliefs, gatehouse and some of the landscape, such as listening to music, to these landscapes to decorate or embellishment space, night lighting more students Hui.
Water View: eg fountain, fountains, wells and artificial lakes, etc., they and lighting combine to create a more attractive scenery. Square has marked sexual landscape, trees, drain fill plants, lawns, flower stalls, etc., so that it formed a certain scale, a create a magnificent night.
Building is the city’s landscape, lighting and build a second city skyline. Modern city due to the unique geographical landscape and cultural environment, and their respective aesthetic ideas and shapes, different styles of architecture in the light next to do now decorate its grand and imposing, and strengthen the city’s unique image, and thus play the iconic landscape value.
Beautiful urban landscape lighting not only for the people to create a good nocturnal lighting environment, enrich people’s nightlife, but also for economic prosperity, the development of the tourism industry, especially for propaganda achievements of China’s reform and opening up and thriving excellent situation, establish and the performance of a region or city at night image so has important significance and impact.
Has great potential for development as a light source, LED’s long life, rugged construction, low power consumption and flexible dimensions, etc. by the people more and more attention in recent years, LED especially monochrome LED is widely used in large-screen, lights and landscape lighting. As LED technology continues to evolve, the white LED luminous efficiency, color rendering, color temperature and a single LED power and luminous flux LED module parameters such indicators continue to achieve new breakthroughs, people are looking forward to LED for lighting.
White LED lights for indoor lighting application
However, the white LED used in ordinary indoor lighting is also facing a number of challenges, such as single LED luminous flux is also difficult to meet the demand for general lighting, the unit cost is too high, the low light efficiency than energy-saving lamps, great color, stability is inadequate. Although research is gratifying, but to truly meet the lighting requirements to produce market-oriented products will take some time, which is LED R & D personnel, manufacturers and users inescapable fact. In this paper, lighting ergonomics, analyzes the current situation and development of white LED light environment and health indicators required for the normal difference between the promotion of LED interior lighting application process made some suggestions.
1, lighting ergonomics
Ergonomics Ergonomics is also called ergonomics or to “man – machine – environment” system as the research object, using measurement, statistics, analysis and other methods to study the “man – machine – environment” between the three elements of the system relationships to solve the system of human performance, health problems. In other words, ergonomics research dedicated to the design and * price of human needs, human capacity, human limits, and how various tasks, jobs, products, environments and systems coordination. Lighting ergonomics, is the study of how the design of light environment to meet human needs, to make people better and faster completion of the visual task or try to meet the needs of a comfortable and healthy.
Illumination environment should take full account of the needs of visual function to meet people, so that people can fit in a visual environment to work properly, which can be clearly seen; psychological needs but also to meet people that want to see comfortable. A recent study showed that light can affect the human body through the secretion of melatonin affect the body’s circadian rhythms and health. Therefore, considering the ergonomics of the environment should be good light from human vision, psychological and physiological needs, a number of factors into account, otherwise it will on people’s working efficiency, psychological or physiological cause adverse health effects.
2, white LED current development
2.1 light efficiency
LED since its inception in the 1960s, in order to improve the brightness of every 10 years, 30 times, 10 times lower prices “Hydes Law”-like pace. According to reports, the current white LED luminous efficiency of laboratory data has more than 100lm / W, and into the commercial area of ??high-power white LED has reached 40lm / W. With breakthroughs in key technologies, the future high-power LED light effect still has much room for growth, the highest may reach 150 ~ 200lm / W.
2.2 Flux
With the advent of high-power LED and packaging, cooling and other key technology breakthroughs, 5WLED commercialization process has taken shape, which makes the flux LED module has been greatly improved. From Nichia’s latest research data shows that power was 5.5W and 11W, respectively 250lm and 400lm luminous flux of high-power LED integrated module has been developed. This makes LED for general illumination process forward in a major step forward.
2.3 color temperature and color rendering
White LED color temperature and color rendering with white LED is closely related to the preparation of solutions. 1996 first used Nichia InGaN blue chip plus YAG (yttrium aluminum garnet) $ phosphor method for producing white LED. Since then, people using R, G, B three color chips mixed excitation light and near ultraviolet chip R, G, B three-color phosphor powder mixed light into the white LED.
Blue LED using YAG phosphor way plus its process is simple, low cost technique, preparation of white LED is the most common way, but its color rendering index is relatively low. Add some red and green phosphor phosphor can improve the color rendering index, though, but because of the red phosphor relatively low conversion rate, usually caused by the overall flux attenuation, namely light efficiency decline. Near-ultraviolet LED plus RGB trichromatic phosphor can theoretically get any color temperature and high color rendering index white LED, but for UV LED phosphor technology is not yet mature. Single-chip phosphor coating method of the phosphor coating techniques, it is generally 80 ~ 800K with a color temperature difference. Multi-chip LED is theoretically possible to get any color temperature and high color rendering white LED, but due to multi-chip LED forward voltage and light output are different, in addition they maintain the temperature characteristics and properties of light is not the same, and thus the circuit design requirements is higher, the current technology is not mature, large differences between modules color temperature.
3, considering the ergonomics requirements for white LED lighting
As previously described, considering illumination ergonomics people consider the lighting environment. Indoor environment for people living and working environment stays most of the time, so people on the indoor lighting needs of the environment is getting high. Can meet these requirements, the LED light source instead of traditional interior lighting of the key.
3.1 visual function needs
In order to meet people’s visual needs, namely to make people able to see clearly, which requires illumination environment with a certain level of illumination, illumination uniformity and color rendering.
To meet certain level of illumination, the LED requires a sufficient flux. Reading room with a small example, assume reading area 6m × 8m, then about 20000 ~ 30000lm flux in order to meet people’s normal reading. Without considering other factors, the application of high-power currently on the market 200lm particles 100 to 150 particles also need to be able to reach such an LED illumination requirements. Due to the current market products better light efficiency at 30 ~ 40lm / W or so, whether energy or cost, LED and energy-saving lamps can not compete or fluorescent. In addition, LED lighting optical design technology immaturity make the current LED lamps light distribution is not stable enough to reach a certain uniformity of illumination also requires a very high cost. However, a small area of focus for the lighting of the LED with a small power consumption to meet the visual needs, uniformity also relatively easy to meet. In terms of color, white LED current can basically meet the general needs of indoor activities.
3.2 psychological needs
In normal indoor work or activity, it requires not only get the satisfaction of visual function, but also requires a certain visual comfort, this is the people’s psychological needs illumination light environment, it requires the field of view can not have direct glare light environment or indirect glare, color temperature to the right, lighting layout should be comfortable. In the field of view requirements glare of white LED are both advantages and challenges. As the LED light point and a small beam angle, the light emission direction is easy to control, but on the other hand, the LED light intensity generally more concentrated at the maximum light intensity distribution is easily if mishandled to cause glare to the observer. Studies have shown that not only cause discomfort glare efficiency decline, but also cause visual fatigue and headaches and other adverse reactions. In addition, if the choice of RGB three-chip LED, although able to form any color temperature of white light, but the larger the field of view of the color difference will affect the overall comfort and aesthetics. If the selection of YAG powder blue LED plus the way, the basic color temperature is high. In order to have a good effect of the illumination, the color temperature of the light source must be selected and adapted to the requirements of illumination, Figure 1 shows the illuminance and color temperature corresponding to the comfort zone. Therefore, the higher the color temperature can also affect white LED interior lighting applications, because it requires a high illuminance appropriate to make people feel comfortable. On the other hand, LED flexible dimensions that LED lighting has been designed with a lot of space, we can fully meet the decorative requirements.
3.3 physiological needs
Indoor lighting people on physiological needs mainly for health needs. In addition to long-term UV radiation can cause skin adverse effects other than light affect the health of the other two ways are often overlooked by people, is a light through the visual impact on health, and the other is light through the circadian system affect health. With white LED for indoor lighting has two effects is closely associated retinal blue light through the hazardous effects and suppress the body’s secretion of melatonin circadian rhythms affect the body systems and health. UV damage usually occurs before the eye portion of the human eye, which can cause damage to the cornea. The Blu-ray because of its longer wavelength than UV light can reach the retina through a fundus; while the unit of energy in the visible range of the strongest, easy to burn the retina and the early formation of cataracts. On the other hand, the body’s secretion of melatonin by light effects, when melatonin secretion disorders is likely to cause confusion in the human circadian rhythm, cause cancer or other serious diseases.
In the region of 400 ~ 500nm, the energy distribution of this white LED has a distinct peak. Added after a certain amount of red phosphor can be reduced to some extent this peak, but the current widespread use of white LED and blue peaks of the blue region of the spectral sensitivity curves of retinal damage and affect the circadian rhythm system ganglion cells sensitivity to light curves have more overlap area, which can not but arouse our attention. And if using a UV LED and RGB trichromatic phosphor plus multi-chip white LED, these two effects can be ignored.
4, to promote white LED interior lighting applications
High-power white LED light effect though, the color and the single power has made great breakthroughs in the LED manufacturers are also constantly updated rapid momentum has been achieved. However, taking into account the ergonomic aspects, for the need to create a line with the Habitat lighting environment, LED is clearly still a long way to go. In order to promote LED more and more reasonably applied to indoor lighting, the following aspects are LED designers, producers and the users should be of common concern.
4.1 the importance of appropriate lighting design
Needs in terms of visual function, LED luminous flux and luminous efficiency is also difficult to meet the needs of a large area of ??general lighting. Thus, reasonable lighting design is applied to the LED interior lighting of the key. For example, the partial use of LED accent lighting, or the use of easy to control the characteristics of LED auxiliary lighting and dimming design. Design should be combined with visual function, psychological and physiological needs, weaknesses, creating a healthy and comfortable light environment.
4.2 emphasis on the LED, midstream and downstream of the close contact
Undoubtedly, LED on the upper and middle reaches of the development and application of LED technology has played a key role, but the downstream applications and demand for the LED also play a leading role on the middle reaches. Scientists, engineers, and designers should strengthen ties, the LED industry development more rational and humane.
4.3 Strengthening LED secondary optics design technology
LED lighting applications, a key technology is the LED secondary optics design technology, through the secondary optical design, to optimize the LED light distribution, while avoiding glare emitted from the LED light is more reasonable to achieve the lighting requirements.
With the city’s economic construction and the rapid development of transportation, urban construction as the increasing number of large scale and lighting, urban lighting electricity consumption is also rising rapidly. How to meet the city residents and visitors from all live and work requirements, to meet the traffic safety, traffic smoothly under the premise of promoting low-carbon economy, promote green lighting. In urban road lighting, scientific and rational energy saving has become an important topic. This article on this subject to talk about their experiences.
City lights energy-saving technology
First, the appropriate illumination
In our city road lighting energy-saving work, proper illumination is the first to attention. We want to follow, “city road lighting design standards” CJJ45-2006 standards, according to the nature and scale of urban roads, for urban road lighting design. Meet the requirements of a variety of lighting standards proposed design, undertake a comprehensive technical and economic analysis and comparison, to choose the technology advanced, economical and optimum road illumination energy conservation values ??and lighting power density values. Not be divorced from “urban road lighting design standards”, one-sided pursuit of brightness, the pursuit of beauty, the pursuit of luxury.
Second, the capacitance compensation
The main city road lighting source is a gas discharge lamp, the starting current, the power factor is low, generally 0.45 or less, this will result in large current loops on the line to generate more losses. “Urban road lighting design standards” requirement should be added to the gas discharge lamp capacitor compensation, power factor compensation shall not be less than 0.8. However, the standard does not explicitly single lamp is concentrated dispersion compensation or compensation. Currently two kinds of compensation capacitors are in use. I think, as street lighting facilities are evenly distributed on both sides of the road, by the power to low voltage wiring long street lamps, road lighting system produces losses mainly occurred in this period, the use of lights at centralized power compensation, does not reduce the pressure power wiring. The use of a single light dispersion compensation, will undoubtedly reduce the lamp power to the lamps which generate a loss on the line, will play a good energy-saving effect.
Third, the implementation of control at midnight
Turn off the light source at night half way direct and significant energy-saving effect, saving operation time saving up to 50%, overall about 30% or so. Currently, the city control method commonly used in the night, to take “every one bright one” or “bright one every two” measures, the closure of some light, energy-saving effect is very obvious. However, the use of “bright one every one” or “one every two bright” mode, it will cause bad road illumination uniformity. Unilateral cloth lamps, light sources should not promote close half way. If you choose this approach, the disparity between light and dark lanes late at night, illumination uniformity is far below the design standards. In practice, I believe that the program can be double light fixtures, two light sources such as power or unequal power available. With this cloth lamp options, ShangBanYe two full bright light, late at night close one source. In this way, the control uniformity had no effect, unilateral arrangement, staggered, symmetrical arrangement, can use this program.
Fourth, intelligent light buck – Regulators – dimming technology,
Intelligent Light buck – Regulators – dimming technology, the device is installed in the power distribution circuit Qiduan street in before midnight for the whole loop pressure control the lights, close to midnight, the car came from a lower voltage thin people. Its saving principle there are two, one is to maintain high pressure sodium lights voltage below 198V, the light will not be extinguished; second is due midnight grid users less load is low, the grid voltage higher than 220V, and overvoltage an additional portion of energy consumption, the use of this device is to avoid this part of the waste. According to engineering practice, and its energy-saving effect in about 15%. With this device, not only saves energy, does not affect the uniformity of illumination, but also to avoid light overpressure run, extending the life of electrical light source. It should be noted that this method is a step-down power distribution circuit, within the circuit all fixtures in the low-voltage operation. As street distribution circuit supply radius up to 800 meters, with the lamp and power supply terminal distance increases, the voltage gradually decreased, if the lines are poorly designed, there may be a remote voltage source can not meet the normal maintenance of the required voltage.
Five, using variable power ballast
Variable power ballast, use gas discharge lamp in proper operating current is reduced, the principle still running through the rest of the night to increase ballast reactance, thereby reducing the source current to achieve the purpose of energy saving street lighting system as a whole. In this way because it is installed at the lamp, can be applied to a variety of lamps and lamp combination arrangement. The original road lighting engineering, may also have additional type variable power ballast transformation, supporting the original lamp ballasts shall not replace, convenient transformation of the construction, and reduce system cost.
All LED street lights currently in the design of the processor heat sink can be roughly summarized as aluminum extrusion heat processors, fin-type heat pipe cooling the processor and the processor of combined heat, cooling aluminum extrusion which processors are mostly Processor exterior parts exposed to light, the advantage of this approach is the cost of the processor in the heat can be more inexpensive, especially in mold development costs are more competitive, but during the high-wattage product development, the weight is a need to pay attention factor, because the public regulation of poles to withstand the stress, there will be certain restrictions, and therefore at high wattage products, are generally treated using fin-type radiators, or using heat pipe approach to application design heat treatment plant.
LED street lights have a high level of design standards
In addition to the development of the processor heat outside, LED street lights structure is another important role in the power supply, because the prevailing LED products for the DC-driven approach lights, and therefore the power supply must be customized on the vendor LED street lights for each style of product development dedicated power supply, but also have national product safety standards based on the differences in circuit adjustments to meet product sales around the world again when safety regulations. In recent years, we have three places LED streetlight project case experience, LED street light phenomenon accounted for most of the dead were the proportion of the power supply caused by the instability, so the stability of power supply products, will also affect LED street lights for outdoor use, is it within three years to maintain good control of the light fades.
Second, LED street lights in product development is an important technical threshold optical design capabilities, because good light distribution characteristics, allowing efficient LED street light evenly illuminated the road surface in the current Taiwan NS15233 standards, only For lights in a vertical 80 degree angle and 90 degree angle must be less than 30 and 10 glare quality requirements. In addition, the level of 65 to 95 degree angle, but also need to have more than a certain luminance limit requirements, the rest of the lighting technology, to see each product’s optical design capabilities, because the case will require some engineering road surface illuminance level limit , then a good optical design, the light extraction efficiency can make a little difference of LED street lights, the actual level of illumination of the road surface was good.
So no problem in quality and reliability of the situation, LED street lights of the competition to see the rest of the soft lighting performance show that the existing LED lamp products, most of all by the German giant OSRAM products used in street batwing wide two isotropic optical design, but in the light distribution design, each manufacturer has its own know-how or do not necessarily accept all of the lights can continue to strive to make the product more to improve the efficiency of road lighting.
Europe, the United States and other places of the LED standard, the same angle of light is required, the quality and the light fades and other requirements, with the LED street lights products, technical progress, we believe that the advent of more and better LED street lights to attract more public sector mining Share tenders to improve the visibility of the overall market LED street lights.
LED High Bay Light, generally large power, widely used in premises, warehouses, storerooms, garages and other environments and some industrial applications due to long life, low energy consumption, no radiation and no mercury, received consumers.
How to chose LED High Bay Light
There are several notes to choose LED High Bay Light.
1, The color should be coordinated to avoid back glare LED high bay light, soft light, brightness uniformity are much better to avoid prolonged exposure to the construction workers of eye fatigue.
2, Some special occasions, such as the coal industry and other flammable region, it’s better to use highest level of proof.
3, It’s better to use high-strength alloy casing as the lamp body, such lamps can fight strong collision or impact, to ensure the safety of life.
LED high bay light construction should be noted the followings:
1,It’s better to have a reasonable distribution of the lamp position to achieve a reasonable distribution of the light source, which are not high brightness, but can make people feel larger space, on the contrary it is easy to feel depressed piranha.
2, In order to enrich the atmosphere of the illumination area, we should reduce the lighting level called waste of energy, where the construction area should be carried out on the LED mining lamp power distribution and rational choice.
3, The construction is completed investigations on the premises, there is no lighting dead to ensure the normal operation of the construction.
4, During the installation for the LED High Bay light with the battery, we should be shortly and carefully, don’t cause any circuit and chaos phenomena
5, Do not touch the battery positive and negative at the same time, to prevent the risk of electric shock.
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
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
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.
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 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 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.
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 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.
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 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.
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
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.
