作者：Blade

Many of the led lighting company said orders fell three to five percent are quite common in the industry

If the target of chip localization can be come true, LED lighting is expected to substantially lower prices, huge civilian market will accelerate to be open.

The economy in Europe and the United States have a depression, and export orders have fallen sharply, mainly in overseas markets led street light industry into a trough. However, continuing to adopt favorable policies of May give the troubled green LED lighting industry hit a shot in the arm. This level of excitement from the Guangzhou International Lighting International Lighting Exhibition as a barometer of the global lighting industry can get a glimpse.

Public information showed,  as the world’s largest lighting exhibition, the Guangzhou International Lighting Exhibition” organized by Guangya Messe Frankfurt Co Ltd, which has been a 17-year-old. Learned from the organizers, the exhibition area of the 17th exhibiton will be expanded by 10 percent, reaching a record high of 220,000 square meters.

However, experts said, LED green lighting industry is ongoing a reshuffle. The industry is still waiting for opening by mainland’s civil market.The premise of openning market is that the chip achieve localization. the led lighting company is expected to cut prices substantially.

As emerging industries, China’s LED lighting industry and  photovoltaic industry have a common Achilles’ heel –three outside: core raw materials overseas, and technology form overseas, the market concentration in the overseas, the market concentration in the overseas, China’s LED lighting industry is mainly concentrated in the lower reaches of the package end.

The data shows that 80% of the products in mainland the led lighting company are export-oriented. Under the influence of the European economic crisis, the weakness of the US economic recovery, since the second half of last year, the orders of the LED lighting business began declining. Prior to that, from the 111th Canton Fair, held on May, 20, we learned that, since the beginning of the order of the mainland China led projects companies from Europe and the United States, it is common to droy by 30%.

“This year, Europe and the United States market situation is particularly acute, a decrease of 40% of orders.” Caiya Hui, chairman of the led lighting company in Shenzhen City. Another enterprise in Donguan also said that ordrs from Europe decreased by more than 50%. The number of LED companies, said that Europe and the United States orders fell three to five percent are quite common in the industry.

The beautiful led lights effect can not afford the high cost of injury

Advances in technology, skills enhancement, car manufacturing has brought more changes. In recent years, the popular group of the led lights  give us a shine. With widely used “daytime running lights”, both beautiful “angel eyes” began to appear in the streets. When people enjoy these cool equipment that brings the visual pleasure at the same time, the problem behind also call for deep thought. Recently, the “Southern Metropolis Daily” damage replacement the led lights produced by the high cost and inconvenience, were reported. How to properly treat these problems become our focus today.

Mr. Dai of the professionals of the automotive lighting systems address this issue, put forward our point of view: auto parts manufacturing, including lighting systems, and design concept, the formation of the trend of more and more accessories difficult to replace of the entire assembly. Therefore, the supply of the spare parts on the market will be involved towards the whole plant maintenance solutions.

Compared with the old car used the traditional light bulbs, LED lamps have long life, better advantages of the lighting and more beautiful appearance. Automotive headlamps when using,  give a heat issue, leading to the surrounding temperature high, and difficult for cooling heating. The width light LED car made the normal operating temperature is below 60 ℃, when the temperature exceeds 60 ℃, the LED becomes less stable. Therefore, the biggest factor to affect the efficiency and lifetime of LED automotive lighting is the temperature. Therefore, If the headlamp of the surrounding temperature exceeds a certain temperature, the LED is very easy to burn, even sometimes the base of the LED lights will directly melt. For most of vehicles using LED lights, if the diode damage is more serious  and need to directly replace the assembly. Therefore, it is recommended to use good LED thermal conductivity. Moreover, in the use of the led lights , If not all lights do not shine, the number of fault lights affect the results of case, the entire assembly to be replaced, thus to keep maintenance costs to a minimum.

How to reduce the replacement cost of the owners? and also improve the existing LED High Bay technology is the problem facing in various car manufacturers. As customer, they should have a correct understanding and application of new technologies, not to use some improper way to safeguard their rights.

Introductions of LED testing methods (3)

Thermal property of LED refers to thermal resistance and PN junction temperature. Thermal resistance is the ratio of temperature difference in channel to its power consumption. Resistance and junction temperature are two important parameters which will impact an influence on LED High Bay photoelectric properties. There are two main methods for measuring LED junction temperature: using infrared microscope and micro-thermocouple to measure the surface temperature of LED chips. This value is approximately equal to LED junction temperature. Another method is to calculate temperatures of PN junctions according to the current-temperature relations. The later is more accurate than the former and has been widely used.

Thermal property of LED refers to thermal resistance and PN junction temperature.

Reliabilities of LED Lights include electrostatic sensitivity characteristic, service life and environment properties. Electrostatic sensitivity characteristic is the maximum electrostatic voltage that LED can endure. Some LEDs have higher resistivity and longer distance between positive electrode and negative electrodes. When electrostatic charge accumulated to a certain amount on both ends, PN junction will be breakdown. In more serious conditions, LED will be destroyed directly. Thus electrostatic sensitivity test for LEDs is necessary before installing them onto lighting boards.

 

Service life of LED Projects is calculated though another parameter: light attenuation, need long-term tests. In order to obtain an average value, scientists need to choose LED samples randomly. Through long-term observation and statistics to estimate the average working life of LEDs.

 

Environment characteristics of the LED need to be tested in simulated conditions. Like high/low temperature impact test, humidity cycling test, salt spray test, dust test, irradiation test, etc.

 

All LED testing methods mentioned above have strict international standards. As for electrical property tests, final reports should contain curve graph for forward bias voltage, backward bias voltage, forward bias current and backward bias current in accordance with related standards. Tests for luminous flux should using 2π structures. Light intensity should be measured in conditions provided by CIE-127. Spectrum tests, thermal property tests, service life tests all have their own standards.

 

LED has been developed more than ten years in China, there still lacking of scientific and effective standards. Standards for LED testing methods can eliminate differences that exist in LED testing in different regions. In other words, it can help realizing the unification of the commodity. The testing results can truly reflect the overall level of Chinese LED industry.

 

scientist of the led lights

Who invented LED? Nick Holonyak, Jr. is the right person? LED (led lights) is the name of the theoretical formal light-emitting diodes, a solid light-emitting device, the solid semiconductor chip as luminescent material, the epoxy package by the carrier in the semiconductor compound release excess energy caused by photon emission , there is no filament light easy to burn, heat deposition, the light fades and other shortcomings, the direct issue of red, yellow, blue, green, blue, orange, purple, white light.

scientist of the led lights

LED lighting products are the use of LEDs as a light source created by the lighting apparatus. LED is called the fourth generation of lighting source of light or green light, with energy saving, environmental protection, long life, small size, can be widely applied in various directions, display, decorative, and backlighting, general lighting and urban night scene of the field. In recent years, some of the world’s economically developed countries around the development of LED (led lights) launched a fierce technology race, and for example the United States since 2000 to invest $ 500,000,000 to implement the National Semiconductor Lighting Project, the EU also announced the launch of a similar rainbow in July 2000 plan, all hope to be able to sweep away the old era incandescent bulb.

As LED is small size, fast response, long life, LED lamps, anti-shock resistance, can improve the utilization of the limited car space, especially in energy-saving issue, LEDs are becoming the choice for headlamp light

The hot issues of the LED to become a world focus, then who first invented the LED? In 1962,  Nick Holonyak, Jr., he was just a large U.S. firm General Electric Company of an ordinary researchers, to create the first a red LED, and he also believes that can emit light of other wavelengths in the future, there are many different colors of light means that the LED (led lights) and incandescent lights must be LED to replace out. Nick Holonyak, Jr. Bell Telephone Laboratories in the University of Illinois (Urbana Champaign) to obtain a Ph.D. in electrical engineering (EE), and in 1954 earned a doctorate and enter one of the most important private research institutions, he only 26 years old, filled with outstanding talent. 1954, when he entered the United States Army began to enter after the 1957 GE, continued until 1963, also invented the first a red semiconductor laser device, which is of LD, known as laser diodes, is a key component of many later CD-ROM device, a printer or copier device. Nick Holonyak, Jr. invented the LED, in 1963 from GE, as his alma mater, that is, we mentioned earlier, the University of Illinois professor of Electrical Engineering, specialized personnel training at home, as well as the morality of the scientist. Many of its students were later set up his own business in Silicon Valley, California, USA, participated in the Silicon Valley technology wave driven.Nick Holonyak, Jr. invented the brake fluid (Thyristor), also known as thyristors have to let AC, DC the ability to convert each other, with some help for the future of electrical energy storage, the world’s three power through the thyristor conversion.

 

high power led price continued to fall 20%, half of domestic fear factory will close down

Overcapacity, high power led price are falling down, probably make half of production used in Sam sung Electronics (Sam sung) LCD TV, Sharp, computer display back-light light-emitting diode (LED High Bay) industry closed down. The only survival industry is the one who gets countries to foster. HSBC (HSBC) Jerry Tsai analyst pointed out that, the global television, computer sales weakness in fear so that LED Street Light prices continued to fall 20% in 2012. For smaller domestic LED industry, factory closings will be the only option. In contrast, the market capitalization of $2.8 billion LED giant safety photoelectric (San-an Optoelectronic Co.Ltd.), Guang dong Elect (EEC-Tech International Co.Ltd,) and other large-scale industry will continue to receive  government subsidies and continue to operate. Noumea Securities analyst Anne Lee said that this is domestic policy, they want the largest industry to survive.

According to the report, the recent capacity utilization rate in most of domestic LED is amounted to only 50%, the industry in 2010 and 2009 bought about 700 LED Lights manufacturing equipment, there is as many as half is in idle state. However, although the high power led price and market growth rate keep slow, yet about 2000000000 yuan of cash of large LED industry still intends to expand production capacity. UBS ( UBS ) report, Tokunho Junta has previously purchased 50 metal organic chemical vapor deposition system ( MOCVD/LED crystal growing equipment ), expecting this year that will purchase 100 sets .An op-toelectronic also plans to buy more MOCVD devices.

The report in the beginning of May, in accordance with the domestic incandescent lamps road map” requirement, this year 2012, in October 1st, 100W or more general lighting incandescent will be officially eliminated. By March 20th, the Ministry of finance, organized the 2012 semiconductor lighting products financial subsidies to promote the project. And it will be held in Beijing and invite public bidding. About 110 domestic enterprises are participated in the bidding. According to the reflect of many LED enterprises, this round of bidding is set a number of restrictions. Such of the requirements of energy-saving certification.

In fact, some news are spread in the industry of last year. The subsidy policy will have a change in style after, to provide ten enterprises subsidies, and to accelerate industry preferred and eliminating the inferior, and to breed competitive brand LED.

heat sink design of top led lighting companies

LED applications is now becoming more diversified, due to the high-power LED input power of only 15 to 20% into light, and the remaining 80-85% is converted into heat, if heat is not timely discharged to the outside world, then will make the LED High Bay chip interface temperature is too high to affect the luminescence efficiency and luminescence lifetime from the top led lighting companies. As the LED materials and packaging technologies continue to develop, to promote the brightness of the LED products, continuously improve, more and more wide application of LED, the LED as a backlight of the display, it is the recent hot topic is mainly different types of LED backlight technology more in color, brightness, life, low power consumption, degree, and environmental aspirations than traditional cold cathode fluorescent (CCFL), and therefore, actively involved in attracting industry.
heat sink design of top led lighting companies
The first single-chip LED power is not high heat, heat a big problem, so the package is relatively simple. As the LED materials technology continue to make breakthroughs in recent years, LED packaging technology change, and gradually developed into a flat, large area multi-chip package module from the shells of the early single-chip type package; its operating current from the early 20mA about low-power LED Street Light, progress to 1/3 to about 1A, high power LED, single LED input power up to 1W, even up to 3W, 5W package evolution.

In lighting applications, such as the mini-projector, vehicle and lighting light source, the required amount of lumens in a particular area need more than thousands of lumens, or ten thousand of lumens, single-chip package module alone is clearly insufficient to meet toward multi-chip LED package, and chip adhesion substrate future trends of the top led lighting companies.

Heat problem is a major obstacle for LED development for lighting objects from top led lighting companies, using a ceramic or heat pipe is to prevent overheating, but the thermal management solutions to the rising costs of materials, high power LED thermal management designed to effectively reduce R junction-to-case thermal resistance between the chip cooling to the final product, one solution of the material, to provide low thermal resistance, high conductivity, to make the heat directly transmitted from the chip to chip attached or hot metal outside of the package shell.

efficiency of top rated led grow lights

LEDs, simple to understand, is the semiconductor light-emitting diode, is the world’s most advanced solid-state lighting technology. LED lights (top rated led grow lights) are not the old faces of the lamp filament bulb, but the material on the semiconductor chip solid state light source. It uses the electron mobility to light, directly convert electrical energy into light energy. Therefore, the power consumption of the LED is much lower with longer  life.

efficiency of top rated led grow lightsMany energy-saving lamps contain mercury and other harmful to the environment, the lamp scrapped if people thrown away, prone to energy-saving environmentally friendly. Such as LED semiconductor solid state light source and fluorescent technology is essentially different from the semiconductor lighting is a cold light source, do not need to inflate, no glass enclosure, do not add mercury to the use of the process from the production process until the end of life can be described as full non-polluting. In addition, LED High Bay lighting (top rated led grow lights) with good color, no flicker, soft lighting and other features.

It is understood that the latest U.S. Congress passed the Energy Act set out the schedule of phase out traditional light bulbs, while the EU market no longer sell incandescent EU countries not only to compensate for the R & D cost, long-life energy-saving lamp enterprises , but also to compensate for the needy families to purchase energy-saving lamps. LED-based lighting (top rated led grow lights) technology developed by the performance of the lamps is expected to improve in the next 10 years, more than 1 to 2 times.

The performance of the light source, energy efficiency, you can use its power and it generates the ratio of brightness between the two to measure lumens / watt (lm / W) to represent. An ordinary Philips 60W frosted incandescent lamp can produce 890 lumens of brightness, so the energy efficiency of the light source is 15.8lm / W. Depending on the bulb package type, the actual performance of the lighting device may appear to fall significantly. For example, if a standard incandescent light on a recessed light, a mirror reflection light, then the loss of the mirror, we can only get 50% of the lighting efficiency.The energy efficiency of the entire lighting device becomes 7.5lm / W.

Introductions of LED testing methods (2)

Using integrating method, LED lighting sources will automatically absorb rays, affecting the final results. In order to remove this influence, technicians need to use auxiliary lamps. Once obtained the luminous flux, we can use it to get the lighting efficiency of LED Lights. Testing methods for radiation flux and radiation efficiency are quite similar to luminous flux and lighting efficiency.

Using integrating method, LED lighting sources will automatically absorb rays, affecting the final results.

Light intensity and light distribution are two relatively complicated compare with other LED testing methods. Spot lighting sources have even light distribution in space. Sensors in different distances and using different apertures will have same results. However, the light distribution of LED STREET LIGHT is uneven. Measuring results will be various depending on measuring distances and diameters of apertures. Standard CIE-127 gives out a series of reference parameters in different measuring conditions.

The spectral parameters include peak wavelength, bandwidth and spectrum power distribution, etc. signal light LED only has one wavelength (spectral properties can only be presented by peak wavelength and bandwidth), while white LED spectrum is a combination of multicolored rays (spectral properties can only be presented by power distribution). We can also calculate color parameters though the LED spectrum power distribution. LED spectrum power distribution can be obtained though spectrophotometers, measuring various rays separately.

 

Switching feature of LED Products can be defined as the optical/electrical/color changing properties at the moment of power charge and power lose. Through them we can obtain the working conditions and physical attributes at these moments, helping us to learn the damages caused by opening/closing the switch to LEDs. Designers also can improve driver module though this parameters.

 

Color properties of LEDs include chromaticity coordinates, dominant wavelength, color purity, color temperature and CRI, etc. Color properties are rather important for white LEDs. Currently, there are two LED testing methods for color properties: Spectrophotometry and Integration. Spectrophotometry can analyze the LED spectral power distribution by using monochromator, then obtain the corresponding color parameters though Chroma Weighting Function. Integration method directly measure chromaticity in the use of specific filters along with photo detectors. Spectrophotometry is more accurate and more complicated than Integration method. Both of them need to measure color parameters with the aid of high-precision instruments. Scientists are looking for cheaper and more accurate methods.

 

track led lighting for car lights

As we all know LED reading lights (track led lighting) interior lighting almost  don’t produce any heat in the vehicle while driving, so in the future, maybe it would reduce at all possible incidents, thereby reducing the serious security risks. Compared with LED lamp life of up to 50,000 to 100,000 hours, 5-10 years, the general life of the vehicle may need to replace. LED lighting can directly convert electrical energy into light energy, fully able to meet the needs of environmental protection and energy saving.

Ordinary incandescent bulbs start a long time, usually in the 100-300 ms, while the LED  (track led lighting) start-up time is only tens nanoseconds. Even the manual mirrors, inside the structure is not too small, triangular bracket, the upper and lower frames, lenses, rotating body, etc. The back of the lens is a sunken black plastic fixed board, be careful when removing. The first to knock out a cavity on the surface of a small branch of the screwdriver and repeatedly rotating down the drill if the drill is more easy way, a good amount of LED High bay circle size, select the appropriate drill bit, dug holes.

track led lighting for car lights

Rearview mirror combination, in accordance with the demolition program will be loaded carriage return. Rearview mirror prone to wind noise at high speed, so you can cut a thin piece of soft rubber, folder lock back into the plane, you can reduce the noise generated. If we use the meter or circuit diagram, the positively charged side of the direction of the lamp to find out, while the negatively charged side of the LED  (track led lighting) is fixed in the nearest body screws.  Direction of light positively charged side LED positively charged side of the wire welding is fixed and you’re done, put the heat shrink tube. Cf before and after the modification of the direction of light, will connect the LED lights and indicators, so after playing the direction of light, will follow the light of the LED lights on the rear view mirror!

In a word, track led lighting for car lights are the future selections for LED lighting use.

Introductions of LED testing methods (1)

LED Street Light has been widely used in industrial area, commercial area and residential area. Lacking of an identical standard in LED testing methods is always the biggest problem for LED industry. Once promoting a new product, manufacturers can only set the parameters though some theoretic values. The most common example is the working time. Most of product specifications will set this parameter as 50000 hours. As a matter of fact, this is a theoretic value rather than testing result, calculated though another parameter (light attenuation) in ideal conditions. In practices, it is impossible for any LED products to constantly work for nearly 6 years without any defects. LED manufacturers and research institutions have a lot of disagreements in setting parameters. Customers often complained that their LED products cannot work in the described conditions (insufficient light intensity, higher temperature). This situation, to a large extent, restricted the development of domestic LED industry. In following sections, we are going to discuss some international standards for LED testing methods: electrical property, optical property, switching feature, color property, thermal property and reliability.

 

Electrical Property: LED is a kind of uni-polar PN junction diode. The voltage-current characteristic can be divided into two parts: forward bias and backward bias. Thus electrical properties of LED high bay include maximum forward current, maximum forward voltage, backward current, backward voltage. LEDs must work under a normal current (theoretically 20mA). We can also obtained maximum working power tough these electrical properties. LED electrical properties should be measured under constant voltage and constant current, by using multimeter.

LED has been widely used in industrial area, commercial area and residential area. Lacking of an identical standard in LED testing methods is always the biggest problem for LED industry.

Optical property: similar to other lighting sources, LED optical properties include luminous flux, lighting efficiency, radiation flux, radiation efficiency, light intensity, light distribution and spectral parameters, etc. We will introduce the testing methods of these parameters in detail.

Luminous Flux and Lighting Efficiency: there are two different ways in measuring luminous flux: integrating sphere method and variable angle photometric method. The later is the most accurate measuring method, but costs much more time. Thus, in normal conditions, scientists and technicians tend to use integrating sphere method to measure luminous flux of LEDs. Integrating sphere method also has two different measuring structures: 1. LED is settled in the middle of the sphere; 2. LED is settled on the edge of the sphere.