作者：Blade

Cooling technique for super high power LED lights (2)

The thermal transmission process of super high power LED lights:

As for normal LED lamps, LED chips are the source of heat. Heat will be transmitted within the entire lamp in three ways: conduction, convection and thermal radiation, in which thermal conduction makes the biggest contribution. Thus when technicians design the cooling section for a certain lamp, they will attempt to improve the thermal conductivity of each section with it.

 

As for normal LED lamps, LED chips are the source of heat. Heat will be transmitted within the entire lamp in three ways: conduction, convection and thermal radiation, in which thermal conduction makes the biggest contribution.

 

Feature above is a typical structure for LED system. The thermal conductivity is basically determined by the thermal resistances between LED, circuit board and the air. There are three main problems within this part:

  1. Thermal resistance of LED components determines whether heat can be successfully transmitted into bases. Thermal resistance can be reduced by improving packaging technique, choosing suitable materials.
  2. Reducing thermal resistance between LED chips and circuit boards. Normally, it will be determined by materials of circuit boards, distances between LED chips and circuit boards, distributions of resistors on circuit boards and the connection of LED chips and circuit boards.
  3. If the thermal resistance between circuit boards and the air is too large, the collective heat will increase the working temperature of the entire lamps, even though all of the heat generated by LED chips were completely transmitted from LED chips into circuit boards.

In follow sections, we are going to give a small discussion on how to improve the thermal conducting capacities of super high power LED lights though these three respects.

 

Thermal radiation of LED chips and LED STREET LIGHT.

Most of the heat generated by PN junction will be transmitted though bases, glues and heat sinks. The simplest way is to increase thermal conductivities of them, and meanwhile increase the contact area (which can also raise thermal conductivities). In consideration of space restrictions and cost of production, the improvement in this aspect is rather limited. Among them, glues are most likely to be changed. Designers tend to use glues which have small paste thickness, like heat conducting glue, conductive silver paste and tin slurry. These three materials are typically used as LED chip glues. Among them, heat conducting glue has a relatively low thermal conductivity, conductive silver paste has better thermal conductivity and also paste strength, but it is not the best glues, since it will generate a large amount of heat by itself as well as send out toxic metals (lead). Compare with the former two materials, tin slurry is the most suitable LED chip glues, both in heat conductivity and in electric conductivity.

 

Cooling technique for super high power LED lights (1)

As for the fourth generation lighting source, LED is a great technical innovation in history. They have many advantages: high light efficiency, long life, fast respond and environmental friendly. However, completely replacing traditional lighting products is still a long journey for LEDs due to technical difficulties or maybe technical bottlenecks. Among various technical bottlenecks, cooling system is always a big trouble for LED manufacturers. Nowadays, with the rapid development of LED technique in lighting area, the luminous flux of LED lamps is increased continuously. But, respectively speaking, the cooling system cannot keep path with it. For example, the birth of super high power LED lights is definitely a large step of LED lighting technology. However, as a matter of fact, this type of lamps has not been widely used in the market just because of the lag of cooling system. They are incompetent. The aim of this article is to simply explain and analysis the current cooling technique for LED lamps.

As for the fourth generation lighting source, LED is a great technical innovation in history. They have many advantages: high light efficiency, long life, fast respond and environmental friendly.

LED is a solid semiconductor which can convert electricity directly into light. They are small, bright, reliable, consume less energy, radiate less heat, can be used for a very long time, these advantages contribute to the widely spread of LED technique in lighting area. LEDs have very limited surface areas and also high current concentration during work. Normally, multiple LED chips will be mounted on a lighting board as the lighting source. As we all know, longer working in high temperatures will cause LEDs degeneration, leading to a drop in light intensity and working life. Indeed, LED technique can generated less heat than traditional lighting technique, but this is based on single LED chip. For multiple LEDs lighting board, cooling system is a cannot-be-ignored part. Due the continuous improvement of LED luminous flux (power consumption), more sophisticated packaging technique is necessary. Currently, cooling system is a main obstacle for super high power LED lights, especially for vehicle LED applications. Some of the external vehicle LED applications require high power LED STREET LIGHT technique. Designers need to take shape design into account along with cooling section. It is really difficult for them. Whenever this problem was solved, LED technique would have taken a big step in lighting aspect.

 

The global LED driver market will reach up to 10 billion USD in 2016

On 3th Feb. 2012, IMS Research published a new report “Chances for LED drivers”, saying that in 2016 the global LED driver market will reach up to 10 billion USD in 2016.

This report indicated that due to the new legislation and the continuously increased electricity cost, LED lighting market rapidly developed all over the world. In accordance with an initial estimate, the demand LED drivers in 2016 will be around 4 billion, namely 10 billion U.S. dollars. Such amazing performance is far more than the experts expect. Senior market analyst also one of authors of this report Ryan Sanderson said that LED street lights industry is heading in the direction of high power designs. LED manufacturers started to improve their low power residential LED applications, commercialized their high power LED products and continuously sent their “army forces” into industrial lighting area.

 

This report also indicated that traditional lighting market is deep-rooted. LED manufacturers have to provide power suppliers for their LED products, which is a new challenge for them. Unlike traditional lamps or other electrical devices, LEDs work under DC. In other words, LED driver is a new born technology rather than a new born section. To design a good LED driver needs a lot of professional knowledge. It is indeed a challenge for LED companies but also a chance for LED driver manufacturers. Rated power, the number of LED chips and working environment should be taken into account when design a LED driver. Sanderson said that these restrictions made LED manufacturers have to co-operate with professional LED driver factories or set up their own driver teams.

 

Power supplier industry has suffered a long term downturn. LED lighting will be and should be their only chance in next 20 years. There is no doubt that global LED driver market will be a “big cake” for lighting merchants. But the competition in lighting market has always been fierce. Some giant LED enterprises implied that they have no willingness to share this big cake with others. Jonathon Eykyn, another author of this report, expressed his opinion: some LED enterprises can develop and produce their own LED drivers though mergers of small and medium sized LED driver manufacturers. Philips Advance is a typical example. These vertically integrated enterprises have divided up nearly 1/3 LED power supplier market. However, their LED drivers are only suitable for low power low cost indoor LED applications. In terms of high power LED products, the LED driver design is far more complicated. Under such circumstances, LED LIGHTS manufacturers have to outsource this part to specialized LED driver makers.

Chinese LED lighting industry: to defend or to fight? (2)

Chinese traditional lighting industry needs breakthrough. But not every lighting manufacturer must set up its own specialized research and development team for LED Lights. “Chinese LED lighting industry needs more technicians. Real LED technicians. Nowadays, many business men blindly entered this area without any market research or even lack of a basic technical research and development team. It may cause catastrophic damages to them. Meeting with such fierce competiveness, no technique no survive.” Said Dr. Bowen Chen, a senior engineer from OSRAM. Indeed, due to the lack of technique, Chinese LED lighting market has gradually occupied by overseas competitors. Not to mention the traditional lighting industry, even Chinese LED lighting industry requires innovations.

Chinese traditional lighting industry needs breakthrough. But not every lighting manufacturer must set up its own specialized research and development team for LED.

Will the penetration of LED technique into lighting market cause the final reconstruction? Experts gave out deductions as follow: as for the entire traditional lighting industry, LED is an extension update caused by the innovation of lighting sources. LED technique has been used in lighting area for nearly ten years. More and more new born LED China manufacturers entered into this market. Some of them survived at last, but most of them died and disappeared forever. It seems that many traditional lighting enterprises still have no intentions to join into this battle. But this is not to say that traditional lighting manufacturers do not obtain such capability. “We have our own research and development department for LED lighting industry and did master LED techniques. However, we have no willingness to enter this emerging market so quickly. Now is not the time. We still have many works need to be finished firstly, like marketing analysis, product research, customer estimation and so on. We need to choose a right time to enter this market.” Said Xu Hui, the general manager of a traditional lighting enterprise in Guangzhou.

 

According to Wei Chen, an expert in LED lighting area, Chinese lighting market will be reconstructed in near future due to the emergence of LED Street Light. “LED is not just a lighting source. Its advantages in technology are obvious. It is not easy for traditional manufacturers to take part in. LED chip technique, power supplier, cooling section, combination of shape design and light optimization, it is new technique that completely different from traditional lighting products. The one who can make products does not mean that he can make good products.”

 

triac dimmable led in Light curing machine

LED lights curing machine is used in the clinic with triac dimmable led, dentistry and other light-curing resin is cured, for dental repair teeth.   Ordinary light sources produce light with ultraviolet, infrared and visible light. UV energy, infrared light is easily absorbed by the object, they can easily be irradiated to the object heats up, so, generally in addition to ultraviolet and infrared light, only visible light beam called cold light. But we know that the light itself is a kind of energy, they can be irradiated to the object heats up, so the light curing unit, I think the light on the photosensitive resin (such as 430-480nm) is called luminescence more appropriate. The LED light curing machines, compared with halogen lamps, heat is much smaller, and the light almost all Blu-ray, so that it is cold. However, some curing machines use high-power LED street lights, on one hand, its high light intensity, such as the above 1000mW/cm2, on the other hand, in order to obtain such a large light intensity, must be designed to maximize the drive current, up to 1000-2000mA, resulting in a larger LED heat, issued by the broadening of the spectral range, so that it will also make the resin temperature rises, such LED light curing machines are not completely cold. When you purchase a light side alignment palms, the irradiation light mode palms feeling the temperature rise to determine, we should appropriate to the palm of the hand is not too hot. Excellent curing effect, of course, completely luminescent LED light curing unit with triac dimmable led, is being more and more doctors recognize. LEDs can be divided into two categories: special high-brightness LEDs and high power LED high bay lights. High-power LEDs emit light intensity is higher, some single LED could be strong up to 700 or even 1000mW/cm2, but compared with the traditional ones, its wide spectral range, but also a certain degree of fever. triac dimmable led in Light curing machine As discussed previously, the super high brightness LED light almost 100% light, but for a much wider spectral range of high-power LED like triac dimmable led, usually 410-510nm visible, it also has many non-effective light can be seen from two who spot the thermal contrast visually determine from the cured resin temperature rise test out. Of course, due to the high light intensity, high-power LED light curing unit, curing time is much shorter, usually 10-15 seconds, which can reduce the operating hours of doctors, doctors lighter.In addition, if you are using a photosensitive resin sensitive wavelength is special, then you should use a high-power LED light curing machine.

Chinese LED lighting industry: to defend or to fight? (1)

Clayton Christensen mentioned in “the innovator’s dilemma” that there are two different innovations for companies: sustaining innovation and disruptive innovation. In his point of view: with the continuous development of a certain industry, companies and enterprises need to pay attention on “changes in value system”. What is the value system? The value of an object contains two interrelated aspects: 1. the meaning and function brought by the existence of this object; 2. people’s understanding and evaluation of this object. However, all of these things are not static. The earth travelled around the sun, its residents work every day. Everything in this world is continued to change all the time: abstract and non-abstract, including the concept mentioned above. LED China manufacturers must notice this point: customers view of products standards will be changed all the time. If they ignore the game rule, they will be failed at last. However, what is the game rule for Chinese LED lighting industry? The answer is innovation. Facing the pressures from the new born LED manufacturers and their vibrant new LED technique, how traditional LED manufacturers respond? Counterattack or defend?

Clayton Christensen mentioned in “the innovator's dilemma" that there are two different innovations for companies: sustaining innovation and disruptive innovation.

Over the long history, LED street light is just a new lighting technique and will be replaced rapidly in future. “The innovation brought by fluorescent lamps and metal halide lamps will not be repeated as a result of the rapid development of this world. Nowadays the society is one era of information and technology explosion, you could not expect a new born technology to sustain for a long time.” Said Xuhui Lin, a LED Lights designer from Guangzhou. But, there are some people hold different ideas. In their opinion, is the largest and deepest revolution in lighting history and also a chance for Chinese LED lighting industry. For traditional lighting enterprises, it is a continuous revolution in the long term and a breakthrough innovation and change in short term. This innovation far exceeds their ability, struggling to deal with this “attack”. Fact proves that each part of them is terribly defeated: their research and development departments, their marketing centers, their testing teams their purchasing teams. Even their fully-built powerful selling channels are unable to save them. The LED hurricane will cause the restructuring of lighting industry.

 


tube led lighting and wind/solar energy

In our daily lives, the street lamps bring light into our night. The street of the beautiful city at night, decorated colorful. But the street lamps need a hugh amount of energy, especially the suburban roads and highways away from the power point. Solar hybrid street lighting, that is, wind, solar cells, two kinds of green energy combined with LED products like tube led lighting are complex products from a technical perspective, the use of two energy sources complement each other principle, the configuration of the polycrystalline silicon solar panels, permanent magnet generators, maintenance-free batteries, microcomputer time controller, high efficiency LED lamps like tube led lighting.

No cable, simple construction, wide application domain, sleek, organic combination of utility and art. And transformation on the basis of the original street lamps. Solar hybrid street lighting does not require transmission lines, do not consume energy, is an inexhaustible, virtually inexhaustible energy priceless gift of nature.

Ordinary high-pressure sodium lamps, street lamps buried cable power supply must be used when more than three kilometers away from the power point, the cost of construction of the street lamp power supply line with kilometers of extension, also need to set the boost system. Not only the cost of the power supply line and the line power loss are also many, coupled with the street lamps light up the necessary electricity will consume more.

At present, a great need for the public knowledge of universal education of environmental protection and new energy, wind and solar street light most direct application to demonstrate the environmental and life prospects.

Solar hybrid street lighting, fan rotation dynamic America, the blades can be colorful, sleek windmills arranged along the highway, the wind fluttering, will become a beautiful landscape of the road just like LED STREET LIGHT.
tube led lighting and wind/solar energy
The solar hybrid street lighting is a set of environmental protection and energy conservation as one of the products, with the intensification of the world’s conventional energy shortage, the use of natural wind and solar power this clean, renewable energy will be universal, complementary street light will represent the future development of the street lamp direction. It would be to start with obvious environmental and economic benefits of solar hybrid street lighting, to enhance people’s awareness and understanding of new energy to support tube led lighting.

tube lighting led for shoes

I wonder if you pay attention, LED Lights applications (tube lighting led) in life is really everywhere. From decorative objects to billboards, from children’s toys to automotive lighting, hand-held lighting to electronic equipment are all flash LED wide range of uses. Today, we are talking about the led application of shoes. Such a huge consumer market is a natural footwear manufacturers, contested by the most important thing is the creativity of the LED used in footwear has been firmly established, and manufacturing of technical difficulty is not high, the light source is very low cost, and can attract people attention.

No matter what shoes to install the LED light source in tube lighting led, they must have the button batteries. In fact,  the LED light shoes light module are sold everywhere on the marke. The battery life should be kept better in the more than 300,000 steps. Some small and medium-sized companies are short-sighted, they are purchasing low-cost low-quality LED modules, battery depletion, resulting in a small number of LED light shoes quality distrust.

The LED high bay light shoes on the market are generally selling in children’s shoes, mainly because the children like these luminous, brilliant color and light color. Color light-emitting the LED also has been installed in many skate shoes in the transparent wheel, with the rotation of the wheel to send a gorgeous color. White bright LED installed in slippers at night without lights in the room safe walking, there are many LED lights installed in the adult sports shoes, though unlike the children’s shoes as beautiful luminous color, but can greatly improve in the night walking safety.
tube lighting led for shoes
Currently on the market the majority of LED light-emitting (tube lighting led) shoes there is a common problem: not the most fragile light emitting diodes, but the corresponding part of the circuit. Either the battery is not durable, or vibration switch or wiring is easily damaged, these will cause the shoes are light-emitting or light-emitting time is short. May be due to the cost issue, many manufacturers are reluctant to spend money on research or to improve product quality LED street light module, however, these issues are not difficult to resolve, I believe the survival of the fittest in the market, consumers will feel more at ease to buy beautiful LED light shoes.

tunnel led lighting projector

Projectors are very successful products, but in general, the tunnel led lighting lamp life is too short.  The LED high bay projector lamp life is more than 10,000 hours, which is 5 times the traditional ones, also  better in weight and size, no noise, cheaper …
tunnel led lighting projector
First talk about the use of the advantages of the LED lights source projector. As the LED is  cold light source, a lot of heat does not work like metal halide, the volume can be done than the original is much smaller. The power consumption of the LED projector is much lower than the UHP lamp (ultra light), the UHE lamps and metal halide projector confidential is much smaller, and the noise is also low.

If we come to talk about the price, the  consumers are most concerned about that. The high cost of imports of UHP or UHE light, tunnel led lighting source is much lower than traditional light sources cost. According to insiders, produced by the LED light source projector bulbs lumens cost less than NT $ 1, not only light costs lower, due to the saving of the cooling system, to streamline the structure of the optical path, the total cost can be well controlled. This point of view, the high product cost in China sold only 10,000 RMB Toshiba TDP-FF1A 400 lumens.
Finally, look for the deficiencies of the LED projector. Toshiba TDP the-FF1A have brightness significantly increased to 400 lumens, and even the Samsung P310 is the highly increased to 1400 lumens, but for business use is still low. Therefore, through technical means can continue to improve LED brightness, but the LED street light source, the price is still very high, coupled with commercially available products of LED projector, the resolution the majority stay in the SVGA standard. As the brightness is insufficient, the volume is too small, palm-size projector you want the projected 60 inches or more high-quality screen is quite difficult.
Talked about so much, in fact, the advantage of the tunnel led lighting products of the projector is still very obvious. With the launch of the Samsung P310 and a number of more mature products, LED projector should become the mainstream of the market.

tunnel light led in car lights

LEXUS LS600h start selling in the world, striking more than just the application of the world’s first full-time four-wheel drive hybrid V8 engine, more importantly,  it is the first commercial application of automotive tunnel light led  headlights, which indicate that the LED Lights formally announced into the vehicle headlamp market.

German depot R8, Audi  cars car before headlamp using the full range of tunnel light led products industry initiative that broke out after Toyota LEXUS LS600h the footsteps of the LED car headlights market.
tunnel light led in car lights
Although in the past few years, high-brightness LED gradually be applied in automotive lighting, 2004, about 30% of the new models as the brake lights with LED front turn signals, rear turn signal, left and right turn lights, rear fog lights and reversing lights. Japanese automobile manufacturers in 2007 LEXUS LS600h hybrid vehicles have been successfully commercialized the operation of LED car headlights. LED industry had a positive impact on the car of the future. Data shows that the vehicle LED street light industry market size of more than $ 200 million in 2003, 2004, the market size of approximately $ 236 million, the 2005 market size of more than 300 million U.S. dollars. Expected to market size in 2008 will exceed $ 450 million. If the white tunnel light led car headlights rapidly growing popularity of commercial operations. Then the car in all aspects of the LED industry forecasts will be reached earlier, and more likely to exceed the estimated value.

From the point of view of the future development of car headlights, white LED light source or the advanced automotive lighting design, modeling exquisite, compact, high efficiency, energy saving and environmental protection requirements. But for now, the real realization of white LED headlights commercialization are still quite a long way to go. The good news is that the commercial operation of LEXUS LS600h allows other manufacturers to accelerate the pace of reference and application. Needless to say, compared to a car factory HID or halogen, LED car headlights cost is very high. Has launched the very few manufacturers of LED high bay car headlights, because some issues to be resolved, is the light output, thermal problems and error design aspects.