作者：Blade

LED lighting product in Central Africa Cooperation Working Conference Held in Beijing

In response to the national “China-After science and LED Lights technology partnership” appeal, in 2010 October the State Ministry of science and technology implementation of China and the Republic of Kenya higher education and the Ministry of science and technology on the construction of apropos signed ” “semiconductor lighting demonstration project” and the “memorandum of understanding on the establishment of high efficient in Vito network to illumination center memorandum of understanding”, effectively promote a semiconductor lighting cooperation, China-Africa Cooperation semiconductor lighting in February 24, 2011 working conference held in the Institute of semiconductors. The meeting about led lighting product was convened by the National Semiconductor Lighting Project R&D and Industry Alliance. The people who from the semiconductor lighting related companies attend the LED PROJECTS meeting.

At first, the government China Solid State Lighting R&D and Industry Alliance, non-semiconductor lighting cooperation projects on the development of cooperation in a report. Described in detail the background of the non-semiconductor lighting on the basis of the implementation of relevant national call, can improve the lighting situation in African countries and improve people’s quality of life, but also conducive to China’s semiconductor lighting companies to develop the African market.

The existing African LED TUBES market development experience in the business representatives and participants to share experiences and views on the lighting market in Africa. Fieldwork in the African market, a vivid introduction to Africa semiconductor led lighting product market conditions, market demand and product characteristics and market competition situation. Lighting market in Africa can be in divided into high low points, but overall, the African market for the product performance requirements are not high, simple, easy to maintain the universal demand of the product. On the project in Africa has a heated discussion about the difficulty encountered. It was agreed that Africa semiconductor lighting has a huge market demand, but the image and reputation of Chinese enterprises in African’s mind is not high and should take effective measures to quickly change and improve the image of Chinese enterprises in Africa. Delegates deeply appreciated the power of an enterprise alone. In the vast African market alone can not play the advantages of the enterprise and also can not meet market demand.

LED lighting industrial, the additional biggest problem is “hot”

Fourth, it is because the heat generated by the LED lights, so it needs for cooling. Compared with the light weight plastic, the thermal conductivity of the metal is much better, but also bulky enough.

Five, Light perception. In fact, it is not a fatal flaw of LED lighting. LED lighting industrial products under the case of the less electricity, and the reason for the issues of the heat for long time, it is because the LED lighting stimulate the visual sense.  But such light is too strong, and if with the quality of the shade or baffles, or in large part to address this glaring problems.

Six, with regard to prices, after read the first five principles, it is self-evident.

LED Flood lighting is not that energy-saving on the matter, the key is to make consumers feel affordable and reliable.

The word “hot” in LED lighting field is sensitive. A word “hot” make a number of enterprises exhausting and make many consumers are neurotic. In the area of LED lighting. LED lighting industrial brand in the Chinese market could get almost none. The reason is simple, it can not solve the “hot” issues.

China professional LED lighting companies seem to have a lot. In fact, except ChangFang light, Really bright, Qingshang lighting etc, most of the little-known small business in the name of walking a fine line. In fact, look at the entire China market, LED lighting products capacity is not large enough to hold up more than one billion people in China’s consumption. So LED lighting industrial gets hot. How long does it sustained? How to continue the fire? This is the number of LED lighting enterprises and the people involved in the LED products, we can easily see that put in the LED lighting industry, the most urgent and the biggest problem is the “hot” instead of “heat”!

We use the foreign machinery and equipment to produce chips, or chips imported from abroad with foreign machine package, and then the foreign machine package, and then the foreign machine processed into finished lamp, however, it is still hot, so then we sold superior products abroad and let the foreigners pick and choose. Why is the Chinese high-tech is always dependent on foreign? More certain businesses even “imported” as the back of the brand’s quality.

LED lighting industrial, the biggest problem is “hot”

Look at this summer, it is so hot, and take a look at this summer’s flooding floods. Not saving and environmental protection, it will be more severe.

After suffering a lot of natural disasters, people is just deep introspection. Energy conservation protection has moved. Government strongly support, a lot of enterprise have answered the calling. People are expecting one energy conservation environmental  protection revolution.

LED lighting is indeed the new energy-saving king, just a few years time, it made known to every family, and took up a hot LED Lights market. The market is hot, but it is helpless and pale. On the led lighting industrial, many of the good news once again full of each big website headlines and impact on people’s ear. Just now and then whoever dedicated people will be got down to as “the wolf came”.

We try to look at the LED energy conservation principle:

One, convert the electrical energy the maximum into light; two, make the most suitable for human visual senses light.

When we put the LED lamp compared with the traditional energy-saving lamps, we can clear judgment, LED lamps are energy-saving. Here, everyone will think that energy saving will be OK?

Let’s look at how the led lighting industrial affect the market. the heat issues, life issues, weight issues, efficiency issues, lighting issues, the price. In fact, more than six come from the energy-saving LED lighting principle link.

First, since there are heat issues, it means that the LED lighting and light don’t convert the lighting energy as maximize, even worse than the common fluorescent lamp.

Second, since the high heat production of the LED to the point of view can affect the cooling temperature, to the point of view, the temperature can be seen in general. led lighting industrial source, what kind of material can withstand up to tens of thousands of hours of hot baking? Of course, there will be such a high-quality materials, but the price would be prohibitive.

Third, about life issue. In fact, it is very simple. The heat of the LED chip will affect the life of the LED lighting source itself, resulting in bad light, but also affect the life of the LED lamps, PCB driver board.

Technology trends of led lighting product chips

Austria microelectronic sensor driving lighting department director Sajol Ghoshal points out, to promote the continuous development of led lighting product technology is the main factor of LED Lights regulations. At present, the construction of the new power plant has become very expensive, so in the future ten years, governments around the world are looking to significantly reduce energy consumption. In a building, a high percentage of energy consumption come from lighting. Therefore, the new forced regulations will affect lighting system design and installation of applications. The European Union is planning to phase out the inefficient light bulbs and has formulated regulations for commercial lighting.

From the historical perspective, led lighting product is a rough control of the electrical load, with a simple switch manual control can be further refined control. For example, the lighting is a rough control of the electrical load, with a simple switch manual control that can be further refined. For example, the California Assembly Bill 32 regulations require the building to 2018 to reduce energy consumption by half. Other building codes, such as California, the Title 24 proposed more specific requirement. Such as requiring the implementation for daylight through windows and skylights capture to reduce energy consumption, and requiring the building equipped with an automatic lighting control system. Currently, low-cost passive infrared detectors has been rarely used in the room. Through building system to control lighting can greatly reduce energy consumption, and provide users with a highly optimized lighting. In this regard, it is clear that there is still a long way to go LED Panel.

Therefore, to use the advantage of  LED power and  flexible lighting control will be the main trend in the next generation of lighting systems. The program allows the lighting system to adjust the brightness and color of the led lighting product of environmental changes in order to meet the environmental requirements, such as when there is sufficient daylight in the room or no one in it, the method can automatically reduce energy consumption.

Meanwhile, with the development of LED Tunnel residential and commercial lighting applications, the demand for dimming increases, but the incandescent lamps which used in SCR dimming is still here, so the dimming driver IC architecture design need to face a wider range of dimming compatibility issues.

Technology trends of the led lights chip

Tony Armstrong, Linear Technology Power Products Division director of product marketing, with the further development of the LED, its effectiveness or the ability continue to improve. Secondly, LED lighting have environmental protection characteristics, which no need to deal with exposure and disposed of in a common toxic mercury vapor in the cold cathode fluorescent lamp. Finally, incandescent bulbs, and often need to be replaced after about 10000 hours. However, the led lights can provide over 100,000 hours of life. These figures are outshone.

Texas Instruments (TI) Business Development Manager Han Gan analysis, it is well known that the LED driver model high ambient temperature, and the module thermal conditions is poor, leading to the LED Panel driver circuit has been working at higher temperatures, which will lead to the reliability of the led lights applications reduce, and shorten the life of a series of questions. So the heat had to highly considered. Reliability and safety regulations is very easy to ignore and part, especially before the enforcement of relevant provisions, in order to reduce costs, part of the LED lighting manufacturers will be omitted reliability and safety circuits, but this is precisely the long-term fundamental of the led lights industry developing and also the embodiment of the design capacity of LED driver chip manufactures. Different chip manufacturers provide programs, which increase the costs vary greatly.

The accumulate Technology Co., Ltd. Product Director Yu Zhongwei think that it should be noted that the shape of the trend of standardization, such as the US Energy Star and Japan PSE specification. In addition, the dimming feature is more and more noticed. Such as the traditional SCR dimming 1-10V dimming, as well as DALI dimming. Finally, it is to address the thermal issues arising from the requirements of the driver program. In addition to cost considerations, a more lightweight requirements, but also must take into account of the better electrical characteristics(efficiency, power factor, electromagnetic interference, output ripple, etc.)

Semiconductor lighting market, technical marketing manager Lin Zhiyan said LED Tube is essentially a low-voltage devices, depending on the color and the current, its forward voltage drop may vary between 2 to 4.5 V, and it requires a constant current to drive.

The perplexity faced by solar LED street lamp energy management contract model

According to the characteristic of “contract energy management”mode, a comprehensive analysis of the LED lights on the confusion of the process of implementation of  ” contract energy management “mode, and proposed the government to play a lending role, which is the current implementation of solar led street lamp in the city.

The perplexity faced by solar LED street lamp energy management contract model

As energy consumption country, China unit of GDP energy consumption is 3 times higher than in advanced countries. The production of specific power consumption of unit product is high from 50% to100% than developed countries. China is undergoing the transition from planned economy to market economy changing period. The original planned economy energy saving management system of solar led street lamp is more and more which can not adapt to the new situation, therefore, it is necessary to introduce and popularize energy-saving work based on market mechanism of energy-saving investment and service.

Energy management contract (EMC) is the arisen new energy conservation mechanism in the last century of 70’s. It is through energy service contracts signed with clients, for clients including energy audit, project design, project financing, equipment procurement, project construction, equipment installation commissioning, personnel training, recognition and energy saving service. And from the customer for energy saving in energy efficiency obtained profits of a business operation. Its essence is to reduce the energy costs to pay the full cost of energy saving project investment. This energy-saving investment mode allows the user to use the future energy-saving benefits for plant and equipment upgrades, reducing the operation costs, improving the efficiency of energy use.

The pattern has the following characteristics for solar led street lamp: one is the energy consumption enterprises without funds to complete the energy-saving technological transformation, which is so called “zero input”. second is the EMC liable for technical and economic risks, energy consumption enterprises pay to EMC payments from energy saving the project benefit, the user” zero risk”; three is the end of the contract energy saving equipment saving equipment and follow-up. and all the energy efficiency go back to energy consumption LED Downlight enterprises.

Contract energy management to a great extent handled the factors which emerged in energy conservation. It achieve win-win situation, and indeed a effective energy-saving invest mechanism, new pattern, which can be popularized quickly in the market mechanism and become the mainstream model of energy saving investment in Europe.

t8 high bay and led backlight

LED-backlit display has been a gradual increase in the proportion of the  notebook screen application, estimated that there will be more than 15% penetration rate in 2014, compared to conventional CCFL LCD screen, LED High Bay Lights (t8 high bay) has lower power consumption, thinner, better The color performance and other advantages, to meet the requirements of the consumer notebook battery work longer hours, more lightweight body, the color is more brilliant.

t8 high bay and led backlight

LED  (t8 high bay) is a way to directly convert electrical energy into light energy semiconductor components with traditional LCD CCFL light compared to the many advantages of LED backlighting technology. Notebook LCD panels, which are arranged in groups on the bottom of the form instead of the traditional thin tube. LED Lights instead of the thin tube, the original light guide plate thickness and a wedge-shaped design was canceled, and turn the light guide plate with uniform thickness and can be the thickness of the overall reducing.

The same time, the LCD system board can be placed to the bottom of the screen to integrate without superimposed on the screen, which is the reduced thickness of the entire LCD screen one of the reasons. Screen with LED backlight technology can achieve the purpose of thinner, lighter and more energy-efficient, this notebook is one of the most conform to their development, thinner and lighter has always been the direction of growth of the notebook computer products If you look at the recent Apple’s new world’s thinnest only 1.94 cm, the MacBook Air, you can feel this trend.

Notebook LCD screen with LED backlight with CCFL backlight to save power and lower power consumption makes the battery life of notebook battery capacity is unchanged longer. The other LED  (t8 high bay) with a relatively low voltage can work more secure than require high voltage to the CCFL. The display has always been a major energy consumer in the notebook computer, notebook battery life is too short, this advantage of the LED Products is attractive.

LED-backlit display screen is not perfect, the shortcomings are in terms of color saturation, in addition, its brightness is not strong enough, should be less than the current mainstream of traditional CCFL LCD brightness.

 

The future of new led lighting will subvert the concept of the lamp

In the large-scale entered ordinary families, many people are very curious. Future LED Lights lamp would be like what it is? The United States Department of energy said: solid state lighting is 50 years in lighting field is the most disruptive innovation technology.  Many people in the industry agreed, and think that new led lighting is subversive products. It born to reform the traditional lighting. In the current exhibition, a number of innovative product LED stunning debut seems indicating a trend: lighting in the future may be rewritten lamp definition.
The future of new led lighting will subvert the concept of the lamp

For example, GE has introduced a slim, stylish Lumination Lumination Series LED lifting light this year. The design is forward-looking, its ultra-thin light guide plate and the edge set of LED technology, the new led lighting for maximum efficiency,  compared with fluorescent, it has a longer life of the slimmer, more innovative styling, enhanced dimming ability and sense of design, lighting designers and end users can also tailored. Individuality and creativity integrate home decorative lighting. OSRAM launch OLED lighting products – PirOLED, which uses five removable ORBEOS flat reflective light staggered maosaic in the double helix lampholders. It can not only create excellent visual effects, but also send a beautiful diffused light.

“Now we see most of LED lamp, LED bulb lamp in the shape of our basic and traditional fluorescent lamp bulb.  GE Asia-Pacific LED lighting products general manager Wang Jian said,  it is because the LED lighting applications has just started, mainly to replace traditional lighting for the mission. The design is similar in appearance just considering that it is convenient to replace the traditional lamp concept of idea and easily accepted by consumers. In OSRAM Wu Shenbo of  Asia-Pacific division president seems simple, actually it does not reflect the LED’s best performance and features itself if it is just according to the traditional lighting profile produced by LED replacement lamps. New led lighting is a solid adjustable light source, which should display for everyone at its most ideal state.  LED small size, low power consumption, controllability characteristics, making it the release of the designer’s imagination more than traditional lighting.

power factor of t8 high bay fixtures

LED Lights, fluorescent or incandescent lamps, we have to understand one of the important parameters – power factor (PFC).

1, power factor of LED High Bay Lights

The power factor characterizes the ability of the lamp output active power. Power is a measure of the energy transfer rate in the DC circuit voltage V and current A and the product (t8 high bay fixtures). In the exchange system is far more complex: that part of the AC current in the loop where the load does not transmit power, it is called reactance current or harmonic current, it makes multiplied by current in the power (voltage Volt Amps) is greater than the actual power.

2, the apparent power of LED Flood Lights

power factor of t8 high bay fixtures

As the product of power: AC voltage and AC current. Formula is expressed as: S = the UI. Where S is the rated output power  (t8 high bay fixtures), the unit is VA (voltammetry); U is the rated output voltage, the unit is V, 220V, 380V, etc.; I is the rated output current, the unit is A Apparent power includes two parts: the active power (P) and reactive power (Q).

(3) reactive power
Lamps and all other electronic rely on the DC voltage circuit, leaving the reactive power does not work. General users that the lamps and the like devices will require the active power, without the need for reactive power. Since the reactive power is not acting, you want it and where to use! So of course they think that the power factor is one of the lamp. Because it gives the maximum output power. However, the reality is not the case.

A lamp when the AC mains input rectifier, pulsating DC voltage, if the ripple voltage of any processing, it is provided directly to the lamp, no doubt, the circuit did not work. When the lamp  (t8 high bay fixtures) power factor close to 1, but this is what to use it. In order for the lighting circuit to work properly, must provide a smooth DC voltage. “Smoothing” must be performed by the filter capacitor connected to the lamp rectifier behind to complete. This filter is like a reservoir capacitor which must be stored a sufficient number of charge, when the gap between the half-wave rectifier circuit voltage remains uninterrupted, able to maintain a normal level.

t8 led fluorescent tube and heat sink

With global energy shortage and environmental pollution, the LED with its energy-saving and environmental features of the vast space, the application of LED light products are attracting the world’s attention in the lighting field. In general, the LED lights work stability,  no matter the quality is good or bad, and the lamp cooling is essential, the heat of the high brightness LED lamps (t8 led fluorescent tube) on the market, often using the natural cooling effect, which is not satisfactory. LED lamps, LED light source to create LEDs, thermal structure, drives, lens, so the heat is also an important part, if the LED can not be a good heat, it’s life will also be affected.

1, thermal management is the main problem in the high-brightness LED applications
P-type doping of III-nitride limited by the solubility of the Lord and hole higher than that of Mg activation energy and heat are particularly vulnerable in the p-type region; Sapphire substrates is extremely low thermal conductivity of the device thermal resistance increase, resulting in severe self-heating effect, have a devastating impact on device performance and reliability.

t8 led fluorescent tube and heat sink

2, the heat of high-brightness LED
Heat concentrated in a small size chip, the chip temperature rises, causing non-uniform distribution of heat stress, decline in the luminous efficiency and the lasing efficiency of the phosphor; the device failure rate increased exponentially when the temperature exceeds a certain value. The statistics show that the component temperature rise of 2 ° C, reliability decreased by 10%. When multiple LEDs (t8 led fluorescent tube) are densely packed composition of white light illumination system, the heat dissipation problem is more serious. Solve the problem of thermal management has become a prerequisite for high-brightness LED Street Light applications.

3, the chip size and the cooling of relations
The most direct way to improve the brightness of power LED (t8 led fluorescent tube) is to increase the input power is bound to increase the input power in order to prevent saturation of the active layer must increase the size of the pn junction. Single-tube power increases depends on the device the ability to export heat from the pn junction to maintain the existing chip material, structure, packaging technology, the current density on the chip the same and equivalent thermal conditions, a separate increase the size of the chip junction area The temperature will continue to rise.