月份：2012年8月

London Olympics: outdoor LED display industry had special performance

During the London Olympics, outdoor LED display technology has been widely used, that left a deep impression to people all around the world. Since 2009, large-sized outdoor LED displays have emerged in the market in many countries and gradually became a main force of the display industry. Outdoor LED display industry was always the target of being propped up and have become the important constitutes of large entertainment, sporting events and Square Theme Shows. With the continuous applying of new technologies, the new-formed outdoor advertising continued to emerge, full-colored LED tubes display media resulted from this trend. In this article, we will give a small talk about the market prospect of outdoor LED display industry.

 London Olympics: outdoor LED display industry had special performance

Outdoor LED displays as a type of high-tech products and also the trend of the next generation of LED display applications. They have two obvious merits: longer service life, lower power consumption, higher lighting efficiency, etc.. These properties much more sophisticated than other traditional display products. As an emerging industry, LED has come into an integrity and maturity chain of the industry. The layout of the outdoor LED display industry supply chain mainly performed in five aspects:

1)       Currently, there are no biddings in upstream business (raw LED lights materials like sapphire, MO sources). Industry experts paid more attention on some upcoming enterprises.

2)       Midstream: the fierce competitions in chip industry cause overcapacity of the market. Attention was more focused on high-power, White-Ray LED companies.

3)       Downstream: packaging industry still focused on White-Ray, COB factories.

4)       Too many LED lighting application manufacturers, those who had transporting channel advantages or benefit from the government support policies may have a more smooth development.

5)       LED equipment and instrument industry. Less biddings. Similar to upstream industry, upcoming companies with more advanced production line and product process received more attention.

In the view of global point, most core technology of LED panel display techniques are still controlled in the hands of giant international companies. In the backdrop of the global energy conservation, many counties have issued filament-forbidden plans and started to promote LED technology. Thank you to current support from the government, outdoor LED display industry will enjoy a rapid development in the future.

Japan introduced railway LED lighting and new semiconductor technology

Japan’s railway enterprises have applied themselves to energy-saving area for many years. Compared with other transportations, transportation energy consumption per capita of railways is the lowest one. For instance, transportation energy consumption per capita of the Shinkansen is only 1/25 of that of aircrafts. In order to achieve a more environment friendly effect, the Japan Government decided to replace all traditional railway lighting systems with railway LED lighting technology.

 

Japan introduced railway LED lighting and new semiconductor technology

 

Take Ginza Line “1000” for example. In order to improve the ride comfort, designers increased the output power of air conditions within compartments. Meanwhile installed 17-inch widescreen LCDs to improve the audience effect. After strengthening these functions, the total power consumption of the entire trains grew up numerously. Thus, Ginza Line “1000” adapted a series of technologies with more powerful energy-saving functions. One of them is railway LED lighting technology. Tokyo Metro explained that it is the first time that LED lighting technology was employed in railways in the human history. They also indicated that LED lights would be continued to applied in other public transportations, such like subways, buses, and even some taxies.

 

The new installed LED head lights for trains are only 32W each with two other assisted lamps, which are 16W each. But they provided equivalent brightness to previously used 150W high pressure sodium head lamps. Compartment lights also guaranteed the brightness that equal to or larger than the previously used fluorescent tubes but consumed only 40% of them. The average service life of compartment lamps is around 40000 hours, which is 3.5 times of traditional fluorescent tubes.

 

Beyond that, designers from Tokyo Metro also needed to take railway stations and other ancillary facilities into account. How to effectively reduce the power consumption is as important as that for trains.

 

Presently, in order to cope with the income reduction caused by the low birth rate and the aging problem, Japan’s railway operators engaged in transportation business and meanwhile strived to expand non-transportation business. The ongoing activities included additional shops and other commercial facilities in stations, enlarged the digital signage and improved the high-speed communication network. The power consumption of these facilities occupied an increasing proportion of the total power consuming. Station power consuming accounted for approximately 20% of the commercial power arrangement of rail operators. In order to prevent this trend, rail operators started to apply photovoltaic system and railway LED lighting technology on stations.

MIT is developing automatic LED lighting system

Researchers from Responsive Environments Group of MIT is developing an automatic LED lighting system which can self-judge the surrounding light intensity and continuously adjust the lumen output (by controlling the voltage input) of indoor lamps.

 

Researchers from Responsive Environments Group of MIT is developing an automatic LED lighting system which can self-judge the surrounding light intensity and continuously adjust the lumen output (by controlling the voltage input) of indoor lamps.

 

In this research, scientists decided to use LED lamps which are more easily controlled than other traditional lamps. This intelligent lighting system can detect the real lighting environment through embedded sensors. And adjust the light intensity and color balance through a small card-sized controller. With the help of the automatic LED lighting system, users can self-adjust the light according to their preferences.

 

In addition, central controllers can automatically calculate the penetration light from windows and nearby working areas. If surrounding light is sufficient for users’ daily life or work, LED lamps will lower the output light intensity to a suitable level or even shut off. Vise visa.

 

Is was proved by some experiments results, compared with traditional filament lamps and fluorescent lamps, this automatic LED lighting system can save approximately 65%-90% energy.

 

It has been proved by a research report (released by the U.S. Department of Energy in2009) that about 22% national electricity was used in lighting system in the past five years. Obviously, this energy-saving intelligent lighting system has great developing potentials. Researches from MIT hope that one day this system can also be applied on filament lamps and fluorescent lamps.

 

However, there are still some defects of this system: when the lamps in a state of motion, the embedded sensors need to be recalibrated, generating a series of scattered and various-brightness light. Mr. Aldrich, one of the researchers is designing a new automatic LED lighting system based on infrared LED lights and built-in infrared sensors, in order to solve this problem. “It is really a big challenges to us. Sensors for infrared light have no need of recalibration, but it is very hard to realize. We need to create more accurate and advanced circuits. ” Said Mr. Aldrich.

 

Meanwhile the research group is measuring the lighting reflecting rays in lighting areas, looking for a control method which can realize a brightness control through gestures. Researchers believed that lighting control without and switches will not be just a dream in the near future.

Structure and circuit design for high-power LED tunnel lights

Using lightweight aluminum casing can keep the weight of the entire lamp body under 10kg. LED lighting chamber and electrical cavity can be designed in the IP level of 65 and IP 23 design for the cooling sections. Lighting chambers and cooling sections should utilize reasonable isolations, preventing the interference between these two parts. Due to the poor ventilation inside the tunnel, air composition is relatively complex, abundant vehicle exhaust, waste gases and other toxic chemical gases mixed up within it. It is necessary for high-power LED tunnel lights to be more reliable and corrosion-resisted. Normally, before leaving factories, anticorrosion treatments should be carried out on these LED tunnel lights.

 

Using lightweight aluminum casing can keep the weight of the entire lamp body under 10kg.

 

Circuit design:

LEDs’ voltage-current characteristics are similar to ordinary diodes. The tiny vibrations of external forwards bias voltage will cause huge changes on input current, increasing the internal working temperature dramatically and consequently reduce the service life of LED lighting products. In order to prevent this from happening, high-power LED lights must be supplied by constant current (including high-power LED tunnel lights). On other hand, in order to increase the efficiency of power suppliers, the input voltage should be under strict controls, limiting the peak value of input voltage to match up with LEDs after a certain potential drop.

 

Generally, LED tunnel lighting fixtures consumed more power than other lamps. In order to reduce the power grid pollution, many countries have strict regulations for the power factor (PF) and harmonic content of high-power LED tunnel lights.

1)       Use high conversion, reliable power suppliers. Normally, only power suppliers with a converting efficiency larger than 87% and a PF lager than 95% (powerful in resisting external fluctuations from the power grid) are competent for these high-power LED lighting appliances. These power suppliers are usually equipped with constant-current circuit design, using constant-current to drive LED lighting sources.

2)       Adopt suitable control circuits for tunnel lighting, arranging different lighting modes for different sections. Experienced designers should choose different LED tunnels lights (different power consumption) for different sections. For example, in order to effectively reduce the glare, tunnel lights that used in entering/leaving sections should have a lower brightness (power consumption). Therefore, lamps in different sections should be powered by different drives, make them as close to the tunnel lighting curve requirements to achieve the best lighting effects. Timing adjustment on the tunnel entrance and outlet is suggested. Adjust output current through PWM or use double power supplies. Use single power supply during the night, reducing the power consumption by 50% compared with daytime.

Application requirements of LED area lighting

The main function of LED drives is current-restriction in many conditions to keep LED lights chips from current surges and other operation faults. Most LED drives can guarantee a certain level of safety to effectively prevent electrical fires and mechanical friction fires. In the field of LED area lighting, outdoor temperature will bright greatest challenges to LED drives. Some drives even have to work under high voltages, such like 277VAC, 347VAC, 480VAC.

 

The main function of LED drives is current-restriction in many conditions to keep LED chips from current surges and other operation faults.

 

LED drives used in area lighting should satisfy a certain level of power factor (PF) or standards of harmonic contents. Such like IEC61000-3-2 standard issued by IEC has clearly restricted the harmonic contents of lighting equipments (C type) that have power consumptions larger than 25W. In fact, based on general IEC standard, many countries have their own certifications. A LED lamp with a PF of 0.9 can completely meet the requirements of IEC61000 standard but still incompetent in America’s lighting market. In order to protect domestic LED industry, the American standard for high-power LED lighting products (larger than 25W) has an additional requirement: THD must be lower than 20%.

 

Most LED are lighting applications were used outdoors, which will suffer all kinds of serious environments. It requires LED products with longer working life. It is said that the entire system design has significant influence on service life of LED components. Using LED drives that generate less heat, consume less power and have higher efficiency is rather important. Besides, the improvement of cooling sections and protection circuits is also a key point to increase the reliability of the entire system.

 

LED lighting applications can be intellectualized. Generally, traditional LED street lighting realized intelligent control through timing devices or other light intensity sensors. While LED area lighting have more accurate intelligent control based on power line communication (PLC) or wireless control technology, such like the concentrated control based on time output and light output; brightness level control based on vehicle density sensors; Through intelligent controls, LED lamps can be turned on and turned off or self-adjust brightness level depending on the nearby conditions. Provide full lumen output when activities or objects are detected, while only provide only 20%-40% lumen output in the dormancy state.

Problems for LED area lighting

With the enhancement of people’s awareness of environmental protection, the lighting industry paid more and more attention on energy consuming problems. In accordance with related statistics, in the process of energy consuming, more than 20% electricity is used for lighting. Improving the lighting efficiency to furthermore reduce the energy consumption became an impending issue. Therefore, high-efficiency LED area lighting has been put forward as a hot topic.

 

With the enhancement of people’s awareness of environmental protection, the lighting industry paid more and more attention on energy consuming problems.

 

In the view of application areas, lighting include residential lighting, industrial lighting, street lighting, restaurant and hotel lighting, retails and service lighting. In the view of power consuming, lighting also can be divided as low-power lighting high-power lighting. Typical high-power LED area lighting applications include LED bollard lamps, LED wall washer lamps, LED tunnel lights, LED street lights, LED public security lamps, LED high bay lights and so on. All these are outdoor area lighting applications. Indoor LED area lighting applications include low ceiling lights, high ceiling lights, LED garage lighting, etc.

 

High-power LED area lighting products have many challenges: continuous working in high temperatures aggravates the light attenuation; Safety problems caused by the failure of lighting sources; design challenges in hostile environments, etc. The exiting lighting sources for high-power area lighting applications are metal halide lamps, high pressure sodium lamps, linear fluorescent lamps and compact fluorescent lamps. It is noticed that all of these lighting sources have their defects. High pressure sodium lamps have very poor CRI (only 22). Metal halide lamps have much lower lighting efficiency (only 40%). Linear fluorescent lamps have poor cold temperature performance and compact fluorescent lamps have long staring time.

 

On the other hand, with the continuous improvement of performance and production costs of high-brightness White Ray LED technology, it started to be widely used in the LED area lighting industry. Compared with traditional lighting sources, White Ray LED lights have higher light efficiency (can emit more light per Watt), have higher CRI, have better direction control capability, more environmental friendly and can be easily handled in the starting/shutting process. Intelligent technique also can be utilized in LED area lighting area. Brightness can be controlled automatically by central computers embedded within LED lamps through external mounted sensors.

 

In addition, LEDs are more reliable, which will help reduce operation and maintenance costs.

Commonly used LED lighting sources for grow lights

Currently used artificial lighting technologies in greenhouses are fluorescent lamps, high pressure sodium lamps, low pressure sodium lamps and metal halide lamps. In recent years, with the emergence and development of LED lighting technology, LED lights drives, this new energy-saving lighting source drew a lot of attention.

 

Currently used artificial lighting technologies in greenhouses are fluorescent lamps, high pressure sodium lamps, low pressure sodium lamps and metal halide lamps.

 

Traditional fluorescent lamps provide more green rays (about 50%), the rest are mainly composed of red rays and blue rays (about 25%). The proportion of infrared rays is negligible. It is known that green rays are the “main engine” for pants growing. Grow lights using fluorescent-powder-involved LED lighting sources have much higher lighting efficiency, longer service life (about 12000 hours), lower power consumption (commonly used are 28W and 36W). All these LED grow lights can completely take place of sunlight to provide sufficient lights for fruits and vegetables.

 

Sodium lamps are a type of lighting sources that use mercury and sodium vapor to generate high brightness light, which can be divided into low pressure sodium lamps and high pressure sodium. Sodium lights (LP) appeared earlier than sodium lights (HP), equipped with LED street lighting suppliers, with a sodium vapor pressure less than several Pa. Their wavelength is concentrated around 589nm (yellow rays). Thus in most cases, they can only be used under the coordination of other lamps. Sodium lamps (LP) have very high lighting efficiency (200lm/W). The standard gas pressure of sodium lamps (HP) is 10kPa, much higher than sodium lamps (LP). They send out more red-yellow rays but very few green-blue rays, equipped with LED PWM dimming suppliers, high lighting efficiency, high power consumption, long service life (12000 hours). Sodium lamps (HP) is the most commonly used lighting source in plant lighting area, and also the closest competitors of LED lighting sources. Since sodium lamps (HP) used thermal lighting sources, which will generate a large amount of heat during operation, they cannot be used in short-distance plant lighting applications.

 

The rare metal halide vapor and mercury mixture within metal halide lamps can generate electric in given conditions. They are a type of lamps that emit light through discharge, equipped with electrical switches, spectrum of which can be adjusted by changing the mixture constitution of metal halide, high power consumption, long service life (5000 – 20000 hours). Because of the abundant internal mercury, the recycling of these lamps will bring about a lot of pollution our environment. Similar to sodium lamps, metal halide lamps used thermal lighting sources and cannot be used in short-distance lighting applications.

Nine advantages of soft LED bars

1)       Pure light: soft LED bars used high-brightness SMD LED chips as light-emitting components, which have all the advantages of LED lamps: pure and soft light, no flares, no infrared rays and ultraviolent rays and no flickers. This kind of LED lighting products can be used for decoration purpose (normally in gardens and on cars).

 

1) Pure light: soft LED bars used high-brightness SMD LED chips as light-emitting components, which have all the advantages of LED lamps: pure and soft light, no flares, no infrared rays and ultraviolent rays and no flickers.

 

2)       Softness. Soft LED bars used FPC as substrates, which have a high level of flexibility, can be bent in to any angles without breaking, easy to mode, suitable for modeling various advertising and decoration applications.

3)       Less heat radiation. The lighting source of soft LED bars is single LED chip, which generate negligible thermal energy. Normally, the power consumption of single LED chip is around 0.04-0.08W. Thus all LED bar applications have two common properties: low power and low heat radiation. Some low-power LED bars without any cooling sections can be used in fish tanks as aquarium lamps.

4)       Energy saving. 1210 is a model of LED bars, the power consumption of which is only 4.8W per meter. 5050 LED bars have an average power consumption of 7.2W per meter. Compared with traditional decorated LED lighting products, LED bars are much more powerful in energy saving.

5)       Environmental friendly. Neither lamp bodies nor FPCs are health-hazard. Non-toxic recycling available materials were applied. Extensive use will not cause environmental pollution and destruction.

6)       More safe. LED bars work under 12VDC, which can be directly used in houses without any protect circuits or electricity-proof shells.

7)       Easy installation: the installation is relatively easy for soft LED bars. Equipped with fixing clips, iron wires, iron nets, can be installed in multiple supporting faces. Besides, LED bars are light and thin, which made the simpler double-sided tapes are also available for fixing them. The installation and operation of LED bars need no veterans. Customers could really enjoy the fun of DIY.

8)       Long life: the normal service life of soft LED bars is around 80000 – 100000 hours. That means they can maintain a normal constant work for 10 years. However, it is just a theoretical value.

9)       Wide range of applications. Soft LED bars can be used in many places: building outline lighting, booth lighting, bridge lighting, restaurant and hotel lighting, KTV decorating lighting and billboards lighting.

LED lighting project – the fourth revolution in the history of mankind lighting(Second)

On design and installation process of LED landscape lighting design, engineers and designers should pay attention to the following:

1，     The aim of the Landscape lighting is to make the landscape lighting and landscape coordination through the landscape and the architectural features to reach a new level of landscaping. At the same time, it should pay much attention to the humane and intelligent. The art of the landscape lighting can be life-giving vitality through light and lighting.

LED lighting project

2,   Used in landscape led lighting project, the design should be flexible in order to do during the day and beautify the night art lighting. Landscape lighting in the future, must jump out of the simple crochet and will combine the advantages of LED lights in order to improve the high quality, high level lighting engineering and product.

3,   By building the night landscape through the light brightness and patterns, you should pay much attention to controlling the surface of the light intensity and lighting direction and the viewers attention. Because the building night landscape belongs to the city streets, people will look from many locations and direction. In other words, there will be a lot of viewing distance and viewing line of sight. Therefore, it will take the light design and light installation into comprehensive consideration. Thus, in engineering, implementation of the money for the lighting effects test is necessary for landscape lighting project.

4, Landscape lighting should also carried out on the economic argument by using LED products. The landscape lighting should consider the advanced technology and reliability, capital costs, maintenance management and other related problems in order to improve the reliability of the lamp. Although led lighting project technology is gradually to be mature, the heat and water is still the key issue and should be paid much care on it. If possible, the relative experimental results and demonstration and other materials should be formed to a report, as a part of the design. Relevant experts and scholars should follow put forward the practical advice and suggestions on the use of the led lighting project source in light engineering standards and evaluation of the lighting effects in order to let the project carried out successfully.

113 companies are participated in the subsidy tender of semiconductor led light kits

August, 14, 2012, organized by the Ministry of Finance, National Development and Reform Commission, Ministry of Science and Technology ministries, popular concern to the industry” 2012/2013 annual financial subsidy of the semiconductor lighting products promotion and opening” officially opened at the International Hall of Schönbrunn Palace Hotel in Beijing to a close. On the opening scene, over 300 seats occupied and 113 business representatives from all over the country can not wait for the bid moment.

led light kits

July 18, the three ministries issued a notice regarding to ” 2012  financial subsidy of the semiconductor led lights kits products promotion project” ( here referred to as “Notice”)  “NOTICE” pointed out that the procurement goals set by original tender document cannot meet the new demand because of the significant changes of the national policy, and therefore the tender people will organize the bids soon” Tender restart caused widespread concern and discussion in this field. Organizers issued a new tender document with fast speed and held the bid.

Although the second tender brought much inconvenience to the bidding enterprises, however it did not affect the enthusiasm of the bidding enterprises. Compared with last 110 bidding companies, this time increases to 113 companies. The reporters found that the enterprises which participated in this bidding nearly cover almost the vast majority of domestic well-known LED lighting enterprises and most of them are the transition from traditional lighting.

In the opening scene, Apart from the representatives of the bidding companies, as well as non-tender business people, they and other tender representatives are busy in the companies offer. A business representative coming from Tianjin talked to the reporter about the opening feelings. Some enterprises which the offer is too or too low may want to catch this opportunity to exert some influences. In the offer, they care more about the offer which has great influences in the industry, not all the offers will be taken much concern.

After the bid opening, many business representatives are discussing the ranking during their own companies in the offer in order to estimate the possibility of winning. A company representative told reporters that they took part in the tender and lucky won the bid in 2010. He hoped that this time will also fortunately be the successful tenderer.