作者：Blade

Introduction of LED lighting products aging

Everyday life we ??in the application of LED lighting products often occur from time to time issue such kind, LED products in the beginning when the product is working properly, but after some time there will be light dark light, flashing, fault, intermittent light other phenomena, caused serious damage to the product. Reasons for this phenomenon caused roughly:

led lighting product
1. Applications, the welding process problems, such as welding temperature soldering time is too long, did not make anti-static work, etc., more than 95% of these problems are caused by the packaging process.
2. LED itself cause quality or production processes. Prevention methods are:
1 good solder process control.
(2) aging of the product tested.
Aging is an important guarantee for the reliability of electronic products, the production of the final product is an essential step. LED products can improve performance after aging and contribute to post-use performance and stability. LED aging test in product quality control is a very important part, but it is often overlooked in many cases, can not be correct and effective aging. LED aging tests are based on product failure rate curve that is characteristic of the bathtub curve measures taken in order to improve product reliability, but this method is not required, after aging test at the expense of the life of a single LED products for the price.
LED aging methods include constant voltage constant current aging and aging. A constant current source is a current at all times constant. Has a frequency problem, it is not a constant. It is AC or pulsating current. AC or pulse current source can be designed to a valid value constant, but the power supply is not called “constant current source.” Aging is the most constant LED current job characteristics, LED aging is the most scientific way; overcurrent impact of aging is the manufacturers latest used as a means of aging through the use of adjustable frequency, current adjustable constant current source for such aging in order to determine in a short life expectancy of LED quality, and can pick out a lot of the hidden dangers of conventional aging can not be singled out LED. Effectively prevent failure-PTC thermistor temperature LED current limiting device used in recent years, light emitting diodes (referred to as LED) have made tremendous progress in the development: for indicator development from pure light output of 100 lumens high power LED . Soon after, LED lighting costs will be reduced with the traditional cold cathode fluorescent lamp (referred CCFL) similar levels. This makes it the LED’s growing interest in the following applications: automotive lighting, LED light sources inside and outside the building, as well as laptop or TV LCD screen backlight. High-power LED technology development to improve the design stage of the cooling requirements. Like all other semiconductor Like, LED can not be overheated, so acceleration output weaken, or cause the worst condition: completely ineffective. Compared with incandescent lamps, although the high-power LED with higher efficiency, but the input power is still a sizeable part of the light energy into heat energy instead. Thus, reliable operation requires a good heat dissipation, and requires consideration in the design phase high-temperature environments.
Design LED drive circuit size, we must also consider the temperature factors: its forward current must be selected to ensure that even if the ambient temperature reaches the maximum value, LED chip is not overheating. As the temperature increases, the need to reduce the maximum allowable current, that is derated to achieve cooling. LED manufacturers to derating curve into their product specifications.

LED interior lighting What are the disadvantages inherent

LED lighting from the 1964 invention has been developed to the popularization of the era, and its energy-saving, environmental protection, high brightness, low power consumption, long life, impact resistance and other advantages, the outlook is extremely broad; interior lighting in its infancy, as well as its inherent drawbacks, mainly in the following aspects:
1, the problems caused by inconsistency:
Theoretically LED light-emitting diodes are able to, and in fact all the LED’s electrical properties are different, each manufacturer’s production process is inconsistent, or even a big difference, that is, the same manufacturer are all different times of the process differences; different semiconductor manufacturers use the purity of raw materials there is a difference, which makes the LED luminous intensity is not identical with the drive current, over-current capability and heat resistance differences will naturally different; packaging technology and packaging different materials, making the overall cooling capacity is not the same, there is a combination of thermal expansion and cooling Pang problems. It is not difficult to see, LED light-emitting diode in the short term there are still great differences between individuals, if each lamp only one LED, good control. Such as TV, DVD on the power indicator; And when we make use LED lighting, it is not a single of the LED, but with more than hundreds of thousands of LED into an array access circuit, due to differences between the LED there is always one of the first damage, broken when there are several (usually short), the current will increase the damage other of the LED. This is inconsistent with the results, but also one of the factors restricting its development.
　　2, the drive circuit complex issues:
a. voltage matching terms in, LED, unlike ordinary incandescent bulbs, can be connected directly to 220V AC mains. The LED is 2 – 3. Volt low-voltage drive, the design must be of complex circuits, different uses of the LED lamp, to be equipped with different power supplies. b. during current supply, LED’s normal operating current 18mA-20mA, power supply current of less than 15mA when the LED luminous intensity is not enough, and more than 20mA occurs when the light fades and the resulting LED aging, while fever greatly increased, accelerated aging, life expectancy shortening, when more than 50mA will quickly damage, in order to extend the service life of LED lights, commonly used IC power supply, electronic transformers, power supply and other discrete components, high current drive, be equipped with high-power tube or silicon device, and the other plus protection circuit to a constant current, constant voltage power supply circuit and the power circuit complexity, failure rate, component costs, production costs, service costs will rise. This greatly limits the competitiveness of the market and buying groups.
　　Second, LED lighting circuit characteristics:
A, multi-LED lamp series and parallel matrix structure; B, not control the brightness; C, LED current changes in a certain range does not significantly affect the illumination; D, LED damage cause is that current is too large, more than 50mA, representing small voltage changes caused by a large current changes. So you can control the over-current, which provide the basis for the simplified circuit.
　Third, the solution to the problem:
If WHPTC overcurrent device for protection from the principle known, when the circuit when the current exceeds a predetermined value newsletter speed automatic protection, automatic reset after troubleshooting, without manual replacement. On the LED, the voltage change is not the direct cause of damage to the LED, the LED current increases is the real killer. Using this feature, the LED circuit protection has the absolute advantage, so simple power supply into reality. Practice has proved that the LED circuit failure before the effective protection. The following figure shows, because there can be omitted WHPTC constant current circuit. Device costs, production costs, service costs are greatly reduced. Also greatly increased the product’s market competitiveness.

LED tunnel lights lighting design and application

Automobile exhaust, noise, vibration, polluted air, corrosive gases, moisture and other harsh environments formed tunnel lighting particularity. In order to give vehicular traffic and pedestrians with a safe and comfortable lighting environment, the following analyzes to elaborate tunnel lighting design ideas and methods.
Unlike road led tunnel light lighting has its distinct specificity, and its security concerns in the lighting system is particularly important.
In the design of tunnel lighting options, taking into account the human factor in light adaptation and dark adaptation, attention to transition and transition lighting design. To meet the drivers eyes suitability requirements, as required in a dark tunnel entrance transitional lighting to ensure a certain vision requirements. Tunnel exit due to adaptation time is very short, usually less than 1s, it may be used for other processing.

led tunnel light

      Usually there are several special tunnel vision problems:
(A) before entering the tunnel (daytime): As great differences in brightness within and outside the tunnel, so to see from outside the tunnel, the tunnel entrance very inadequate lighting will see the “black hole” phenomenon.
(2) into the tunnel (daytime): bright outside into the car by a very dark tunnel even after a certain time to go through in order to see the situation inside the tunnel, known as the “adaptation lag” phenomenon.
(3) tunnel exit: During the day, a motor vehicle through a long tunnel near the exit, due to see the outside through the export of high brightness, exports appears to be a “white hole”, there will be a strong glare, driver would feel uncomfortable; night and day on the contrary, see not lit tunnel exit hole but a black hole, so that the driver will not see outside the linear and road obstacles.
Several more special visual problems to tunnel lighting made higher requirements, an effective solution to these visual problems, you can use the following aspects.
　　A tunnel lighting settings
Tunnel lighting generally divided into sections, to adapt stage, transitional stage, the basic and outlet sections of five lighting, where each section has a different role:

led tunnel light
(A) the introduction paragraph: the elimination of “black hole” phenomenon, so that the driver can identify obstructions in the hole place; in the daytime, for example, assume that the tunnel mouth ambient brightness of 4000cd / m 2, speed 80KM / H, then meet the minimum requirements introduction of the length and brightness of 40 m and 80cd / m 2.
(2) adaptation period: After entering the tunnel, the driver can adapt quickly and eliminate the “black hole” phenomenon; according to the above conditions, adaptation of the length and brightness were 40 m and 80 ~ 46cd / m 2.
(3) TRANSITION: gradually adapt to the driver inside the tunnel lighting; according to the above conditions, the length of the transition section and brightness are 40 m and 40 ~ 4.5cd / m.
(4) basic sections: basic lighting inside the tunnel.
(5) Exit Section: During the day, so that the driver can gradually adapt to the exit of the light, eliminating the “white hole” phenomenon; during the night, so that the driver can see in the cave outside the linear and road obstructions eliminate the exit of the “black hole” phenomenon, the general practice is to use the street as a continuation of lighting outside the cave.
During the day, at the exit of the inlet section of the same illumination illumination, basic lighting inside the tunnel should be higher than the value of high brightness; during the night, on the contrary, should be less than the basic lighting brightness values ??inside the tunnel, when the tunnel outside the street lighting, tunnel surface brightness value of not less than 2 times the outdoor brightness value.
Second, the vehicle through the tunnel problems in the process.
　　1 near the tunnel problems arising in the course
　　Black hole phenomenon
During the day, the eyes have adapted to outdoor motor vehicle drivers up to 100000 lx cd/m2 over thousands of natural light, when the eyes go to only a few cd/m2 brightness tunnel environment, because the human eye’s perception of brightness difference is limited, appear to adapt hysteresis , you will see a black cave, while the state does not recognize them. Like to see in a bright environment cave phenomenon called black hole phenomenon. Once the black hole phenomenon, with the vehicle close to the tunnel, the driver’s visual shorten the distance, you can not drive safely. Black hole phenomenon is occurring before entering the tunnel vision problems, tunnel lighting is the most important issue. In order to prevent the occurrence of black holes, starting from the tunnel entrance within a distance sufficient to ensure the luminance, this part of the length of the braking distance than the safety of the vehicle slightly longer.
Into the tunnel, because there is a big difference in brightness outside, there is a delay adaptation, the driver can not adapt quickly tunnel vision brightness, it is difficult to see the situation inside the tunnel. To prevent this from happening, you should make the tunnel entrance brightness with reduced visual adaptation is slow, smooth transition to the brightness, the brightness should progressively be reduced, but the first one after a brightness and brightness ratio not exceeding 3:1, and 2m high these walls can not be lower than the corresponding average surface brightness brightness.
　　(2) through the tunnel problems occur during
Brightness in the tunnel during the day than at night lighting, high brightness, low brightness at night than during the day. Consider the long tunnel in heavy traffic automobile exhaust emissions, then because of smog-forming emissions can not dissipate quickly, the light absorption and scattering, reducing visibility, leaving the visual identification difficult, the front lights influenced by automobile exhaust, unable to meet the legibility necessary, the front surface luminance half-100m, usually two times the brightness of the lighting up of exhaust gas.
　3 close to the problems that occur when the tunnel exit
Look through the export of high brightness outside, exports appear to be a bright hole, severe glare, exports became white cave, which is called white hole phenomenon; background with white hole, and motor vehicles became black silhouettes are easily identified However, in a large van with the back of cars and trucks silhouettes coincide difficult to see, in heavy traffic near the exit of the tunnel, in order to coincide with the size of the vehicle identification made lighting called exit lighting, exit lighting interval length of tens of meters.
　4 night pulled out of the tunnel before the problems
Night, pulled out of the tunnel from bright to no lighting road before, outside the tunnel has become a black hole, could not see the road alignment and the presence of obstacles, this time should be just left the tunnel exit on the road, in Greater safe braking distance is roughly equivalent to a few seconds interval motor vehicle, the road for lighting, in order to achieve an appropriate level of brightness.
　　Third, the LED products in Tunnels
LED applications are implemented in the tunnel lighting LED light with the intensity of light entering the tunnel automatically adjust the illumination intensity intelligent dimming control system. Compared to the traditional programs to achieve energy saving 45%, and the lamp life is 6-8 times of traditional tunnel lamps, greatly reducing light loss and the cost of routine maintenance.

LED lighting dimming system in the future development

LED dimming is best to use PWM dimming using PWM dimming, you can switch on the wall to install a simple PWM generator, and then use the potentiometer to control the PWM duty ratio to achieve dimming. But if the bright lights should switch off, then you need to add a pair of lines. Therefore not compatible with the original wall of the thyristor switch leads. The original thyristor switch only two leads, it can be can dimmer switch. This advantage is very difficult compatible. But in fact, the most commonly used real light is dimming lamp or floor lamp, dimmer switches that are installed in the supply line is not a wall, it just do not care to take advantage of the two leads of the wall. In other words, PWM dimming can be applied directly dimmable lamp.

LED lighting manufacturers
LED lighting manufacturers

Segmented dimmer switch
Taiwan has launched a company called EZ-Dimming a four paragraphs of GM6182 switch dimming regarded as a good solution. Only use ordinary light switch on the wall will be able to achieve dimming paragraph 4, the first to open the full brightness, the second opening is 60% brightness, the third opening is 40% brightness, the fourth opening of 20% brightness. The advantage of this system is to use an ordinary wall switch dimming. And its power factor up to 0.92 or more. Did not produce interfering signals into account. Disadvantage is not continuous dimming. There are a number of operational problems.
Remote control dimmer
Infrared remote control for LED dimming. This of course is the ideal solution. Can switch lights, and the use of a continuous PWM dimming. Disadvantage is the high cost, there is no uniform standard, only for high-end residential.
In fact, we think we should come back to the main purpose of dimming should be. All previously mentioned dimming purpose is to meet the home for people in different contexts require different light intensity. For example, when watching television may be darker, reading time may be brighter. These are mostly in the residence. Few offices, shopping malls, factories, schools, install dimmer lights. And most of these places is installed fluorescent lamps, energy saving lamps, it is impossible or difficult to achieve dimming continuous dimming.
Epoch-making for energy-saving and dimming
Ever since mankind realized that we must do everything possible energy conservation in order to solve the urgent problems atmospheric warming, how to reduce lighting electricity as an important issue on the agenda. Because lighting electricity for 20% of total energy consumption. Fortunately, there have been energy-efficient LED, LED itself five times more energy-efficient than incandescent than fluorescent lamps, energy saving lamps have about twice, but unlike fluorescent lamps, energy saving lamps as mercury. If the dimming can also be energy efficient, it is very important energy saving means. But in the past all light sources are not easy to achieve dimming, and easy dimming the LED is a great advantage. Because in fact, on many occasions without lights or at least not so bright, but it was very bright light, such as midnight to dawn hours of the street; subway cars to the suburbs from the ground open ground in the car lights; more common is near a sunny window when the offices, schools, factories and other fluorescent lamps are also opened there. These places have to waste a day do not know how much power! Past because of high pressure sodium lamps, fluorescent lamps, ceiling lamps, energy saving lamps can not dimming, can only forget. Now switch to LED later, you can freely adjust the light, which can save energy completely down. So for lamp dimming, the family is not the main wall of the dimming applications, the market is very small. Instead, lights, offices, shopping malls, schools, factories demand dimming is more important occasion, not only a huge market, and saving considerable. These occasions do not need a manual dimming but auto-dimming, intelligent dimming.
　Dimming LED street lights
Generally, street lights after midnight there is nothing useful, so the usual practice is to turn off the lights after 12:00 or the opening half brightness. But the most reasonable approach is based on the traffic lights to control the brightness, or even fully adaptive control of brightness.
In order to achieve this intelligent dimming, is actually very simple. As long as the value of the region’s traffic counts curve input to a microcontroller, according to this curve gives the PWM dimming signal to the constant-current drive source can be achieved.
Photosensitive automatic dimming LED lights
In strong sunlight in order to reduce unnecessary lighting, you can use light-sensitive auto-dimming LED lamp (or any other LED lamps).
Photosensitive element is the role of feelings around the sun, if the sun is stronger then outputs a PWM signal to all close to daylight LED lamps (such as LED fluorescent lamp), put their brightness dimmed. A dimming signal generator can adjust many LED lamps, as long as the source of these lamps constant current driver with PWM dimming control interface. This dimming system itself, efficiency up to 92% or more. But there is no line and the wall triac dimmer compatibility issues. This fully automatic adaptive energy-saving dimming any fluorescent lamps, energy saving lamps, high pressure sodium and other gas discharge tube can not be achieved, but it is LED lamps best.

How to Install LED panel lights

LED panel light is a beautiful upscale indoor lighting, its external borders made from aluminum by anodic oxidation, the light source is LED, the entire lighting design is beautiful and simple, luxurious atmosphere, both good lighting effects, but also gives brings a feeling of beauty.

How to Install LED panel lights
　1, Can be mounted on ceilings, walls and mounting surface;
2, Can be suspended from the ceiling or mounted beneath the body. When mounted on a white ceiling, the entire ceiling was the same color, very beautiful, clean and coordinated;
LED panel lamp uses high voltage design (AC85-240V/50-60Hz), can be used in the world; power LED with isolated power supplies, constant current or constant voltage drive, power supply, high efficiency, the power clean, stable performance, safety reliable;
LED panel lights are manufactured using similar LCD TV backlight technology, a new type of surface light source, the light is soft, appearance, has been widely favored by European and American businessmen, a large number of foreign firms are in Buy good quality, good service, good prices and supply panel light products business;
LED panel lights seem just a simple lighting models, but because of its high market position determines the customer’s quality requirements for this product is extremely harsh, plus product itself comes to materials, thermal, optical, structural, hardware, electronics and other fields, the company usually does not complete development team and sufficient experience in the development and subsequent supply chain management capabilities, difficult to really successful development, coupled with knowledge of the market requirements are not clear, so a lot of development costs in return on invested only a customer does not endorse products.
Eneltec was founded in 1982, devoting nearly 30 years to the development and manufacture of lighting products, including electronic ballast, T5 adapters and LED products. Eneltec, with its powerful technology and excellent marketing system, working on providing high quality service to the customers, is growing more and more powerful in lighting industry.
ENELTEC care so much about the brand and also the satisfactory experience of our customers. So we always put a lot of efforts on the products quality and after sales service. We emphasis on applying for the necessary certificates for our target market , controlling every step of the productions , testing before delivery and tracking each order after delivery.

LED chips which everyday problems encountered

A. Forward Voltage drop the dark light
A: A is the electrode and the light emitting data ohms touch, but touch the resistance, mainly by the data substrate low concentration or the electrode mutilated formed.
B: one kinds is the electrode and Data as non-ohm touch, first and foremost occurred in the the chip electrode preparation the process of transpiration first-layer electrode O’clock’s extrusion print or clip printed, spread azimuth.

led light for home
led light for home

Else wrapper process in can also be formed Forward pressure decreased, the primary reason there are silver adhesive curing is not sufficient, bracket, or chip electrodes pollute such as the formation touch resistance is large or touch resistance is unstable.
Forward pressure decreased of the chip in the fixed voltage quiz when, after the chip’s current is small, and then embodies dark spots, there is one kinds dark light representation is the chip self-luminous power is low, forward voltage drop to normal.
2. Difficult pressure welding: (foremost there are to fight non-stick, the electrode falling, punch through electrode)
A: to fight non-stick: The primary because the electrode appearance oxidation or there is glue
B: There are with the light emitting Data touch is not strong and thicker wire bonders layer is not strong, during which the in order to thickened layer of Drop-based.
C: punch through Electrode: usually associated with chip data relevant, data brittle and strength is not high’s Information Yi punch through electrode, usually GAALAS Data (such as high red, infrared chip) representing an GAP Data Yi punch through electrode,
D: pressure welding Debugging should Soldering Temperature, ultrasonic power, ultrasonic moments, pressure, golden goal big and small, stents positioning and other carry on adjustments.
3. Light-emitting Color distinction:
A: the same an chip light-emitting colors have a significant difference between the first and foremost is because the epitaxial wafers information doubt, ALGAINP four element data is selection of quantum layout of the is very thin, growth is the very difficult to ensure that the regional component jointly. (Component resolution band gap, the band gap of the resolution wavelength).
B: GAP yellow-green chip, light-emitting wavelength of will not have a large error, but the because the human eye right to this wave band color sensitive, is very simple find out yellowish, migraine greenish. Because the wavelength yes epitaxial wafers data resolutions of the, regional the smaller the, showing color error concept of the smaller the, so in the M / T job in the there are nearby Selecting Method Of.
C: GAP red chip and some light color is a partial orange, because its light emission mechanism is a direct leap. Affected by impurity concentration affected, the current density intensify when the, prone to impurity energy level offset and light-emitting plump, the light emitting yes beginning turns orange-yellow.
Four. Floodgate Fluid effects:
A: a light emitting diode in the normal voltage can not be turned on, when the voltage height to a certain extent, the current sudden change.
B: occurred floodgate fluid appearances reason is the light-emitting INFORMATION epitaxial wafers grow up O’clock presents a reverse mezzanine, have this presentational LED in the IF = 20MA O’clock quiz the forward drop of there are hiding Xing, in the use of process is the out of north and south pole Voltage will not do large, reflected off, the available test information instrument from transistor Tracer test curve, but also to go through a small current IF = 10UA lower forward voltage drop to find that a small current forward voltage drop significantly too large, then the be able to yes The doubt formed by the.
5. Reverse Earth Leakage:
A: reason: epitaxy information, the chip manufacturing, equipment, encapsulation, quizzes typically 5V under the reverse leakage current is 10UA, also be able to fixed reverse current under the quiz reverse voltage.
B: not the same type of LED reverse features big difference: P Green, Pu Huang chip reverse breakdown can reach over one hundred volts, while S & P chip in ten to twenty volts.
C: epitaxy the formation of’s Reverse Leakage @ foremost by the PN knot internal layout of the shortcomings formed by the, chip manufacturing the process of next to the surface was corroded will not do or there are silver glue silk buildup of In the measured noodles, strictly prohibited to use organic solution is dispensed silver glue. In order to avoid silver glue After a capillarity appearances climbed to the knot zone.

How to test LED lighting product life

Idemitsu products and maintenance of light is LED lighting product life indicators important concern factor. In addition, LED lighting product characteristics and application areas to consider starting life of the product evaluation, there are some differences, for example, in addition to lumen maintenance in addition, LED lighting products and maintain color quality, etc., our group also to carry out research work in this area with a view of the performance and lifetime of LED lighting products do a more reasonable assessment. Table 1 also gives the relevant country or region in the LED lighting product life-related indicators considerations.

LED light lifetime
The United States in 2011 released the IES TM21 “ProjectingLong Term Lumen Maintenance of LED Light Sources” ‖ standard, used in LED packaging, LED arrays, external drive control of the LED module. The standard provides a use of IES LM80 test data to an exponential decay of flux decay model LED light source projected lumen maintenance approach.
① The intervals of not more than 1000h flux test, the test time is not less than 6000h;
② The 0h flux as a benchmark, calculated at each time point lumen maintenance;
③ The exponential decay model φ (t) = β · exp (- αt) lumen maintenance trend curve fitting, if the test does not exceed the total time 10000h, take the last data point for the fitting curve 5000h original data; if the total test time More than 10000h, then take the total test time is after the 50% test point fitting curve raw data;
④ According to the result of curve fitting calculations α and β values??, on the basis on the basis of L70 = ln (β / 0. 7) / α calculating light L70 life (life time if projected from the total test time is greater than 5.5 times (or six times), then take the total test time of 5.5 times (or six times) for the projected life time)

LED lighting fixtures What are the advantages compared to the traditional

1: Energy conservation: LED spectrum almost all concentrated in the visible light spectrum, the luminous efficiency of up to 80-90%. Experiment ordinary incandescent lamp, spiral energy saving T5 fluorescent lamps and emblems Bo did some comparison results showed that: ordinary incandescent light efficiency 12lm / w, life expectancy is less than 2000 hours, spiral energy saving lamp luminous efficiency of 60lm / w, life of less than 8000 hours, while the LED is 120lm / w, life of 50,000 hours. It was also predicted that the future of the LED lifetime cap will be infinite.

LED lighting
LED lighting

Additionally LED also has other advantages, high quality of light, almost no radiation, typical of the green lighting; reliable and durable, very low maintenance costs and so on. Because LED light source also has the above other solid unmatched features, 10 years after the LED lighting industry will be the mainstream light.
2: LED’s operating voltage is low: normal LED operating current of only 10mA, high brightness but also 1A. LED in the production process do not add the “Mercury” and does not need inflated, no glass shell, impact resistance, shock resistance, unbreakable, easy to transport, very green, known as the “green energy.”
3: Long life: LED small size, light weight, the shell is epoxy encapsulated, not only can protect the internal chip, but also has the ability to light condenser. LED life generally in the 50,000-100,000 hours in between, because the LED is a semiconductor device, even frequent switching, it will not affect the service life.
4: The response speed: LED has reached the minimum response time 1 microsecond, more than a few milliseconds in general, the response time of ordinary light is about 1/100.
5: High luminous efficiency: incandescent, halogen light efficiency is 12-24lm / w (lm / W), fluorescent light efficiency of 50-70lm / w, sodium lamp luminous efficiency of 90-140lm / w, large Part of the power into heat loss. The LED luminous efficiency can be achieved through improved 50-200lm / w, and the light color is good, narrow spectrum, can be sent directly without filtering colored visible light.
6: LED components are small: more user-friendly layout and design of various devices, but also better able to achieve in night lighting “saw the light but not light” effect.
7: LED light energy is highly concentrated: concentrated in a smaller wavelength window, high purity.
8: LED light-emitting strong point: light attenuation is much lower than conventional light sources.
9: LED low voltage DC to drive: a load of small, weak interference advantages of the use of environmental requirements are lower.
10: You can better control the emission spectrum consists of: enabling well for Museum and Exhibition in part or accent lighting.
11: You can control the semiconductor light-emitting layer, a semiconductor material the size of the forbidden band width: thus emit various colors of light, and higher saturation.
12: high color: not cause injury to the human eye.

LED indoor lighting conditions analysis

Throughout the world, the development of LED industry, current LED outdoor lighting and landscape lighting has been relatively mature, but on the other hand, LED interior lighting still in its infancy in many countries, especially in China. But as the state has promulgated” road map” to phase out incandescent after, I believe in the next few years, LED interior lighting development will be an explosive leap. LED interior lighting ever before will be good prospects.

led indoor light
LED lighting on a large scale into the interior lighting market, the following conditions is essential.
1.LED lamps improve light efficiency when a low color temperature 4,000 K color temperature is usually below the low of choice for indoor home lighting. Warm white make the whole environment more warm and relaxed; rather cool white is giving clean, efficient and bright feel, more suitable for office and outdoor lighting.
2.LED lamp prolong life, improve system reliability. In general lighting applications, LED’s overall efficiency, service life and reliability can be optimized by the system can be improved.
3.LED light: compact, efficient, and output power of a variety of colors to choose from.
4 Power Conversion: the AC, batteries and other power conversion efficiency as a safe low voltage, constant current power supply.
5 control and drive: the use of electronic circuits to achieve constant current LED driver and control.
6 Thermal Management: To achieve a longer life, control the LED junction temperature is very important, thermal analysis is also essential.
7 optical elements: a lens, reflector or focusing the light guide plate is necessary in the target area of the optical element.

LED Tunnel Light supplier competitiveness

2009 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. In next few years, LED tunnel lamp market will be dominated by a few companies, who occupy a major share of the market. But with the domestic high-power LED chips gradually expand the scale, in the future; this situation is expected to improve, thereby reducing production costs.

led tunnel light
led tunnel light

2009 domestic LED tunnel lights market has 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 is about 80,000 units, estimated 2010 shipments will exceed 12 million units, the market size is expected to exceed 300 million yuan.
According GLII statistics, as of the end of 2009, China’s existing rail tunnel of 6876, with a total length of 3,670 kilometers, it is the world’s first; Chinese total number of 1782 highway tunnel, with a total length of 704 km, it 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, the distance in tunnel lights installation is 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.