月份：2012年5月

The reason for LED lamp market dilemma?

One problem: there is no real openning market

As we all know, because of insufficient penetration of LED lamp market, the public to the LED Lights has been in a stranger. Although some companies in the industry is the leading brand within the industry. However, first-class brand to get consumers in the market really agree with and trust of the public seemed to have never seen. The eyes of the entire industry to market has always been on a test the water of the hotel, shopping malls goals and national mandatory bidding poor small-scale projects.

We all see that, huge market cake only have a trace of smal share of the points. The swarm of LED Street Light companies head long into this narrow space, desperately hoping to grab and cheap runs.  It is not difficult to see that all the them driven to the wall, no positive sign of industrial market. The vast LED lamp market is secretly laughing at the side.

Second Problem: marketing efforts far not in place

LED industry sales model has been too independent on the traditional dealer channel, an irreversible emerging power of fresh forces are creeping up. They are the professional managers.

“See rabbits not spread eagle”, the market is still being in the range of tepid. Because the narrow eyes and professional degree is not enough, traditional dealers keep established in onimmediate gains and losses and the current interest. In the face of the ooperating costs and other costs of store, the dealers have the time and effort to advocate the business of the main products. How many professionalism for the people who are accustomed to wait and see. In fact, it seems also reasonable. Dealers will not be the real push hands for the LED lamp market. When the market have truly effective and quick start, the dealers who lack of long-term vision are bound to rush into mass action. Thus, the future of the LED High Bay market is bound to repeat the mistakes of the traditional lighting industry,  the situation in the industry as a whole turn will  turn into a vicious circle and disorderly the chaotic situation. Therefore, The hope and future of the LED can not be pinned on the top of traditional distributors.

 

Different cooling materials for LED lamps (2)

In previous sections, we discussed two different cooling materials for LED lamps: porous structured ceramic and conductive plastics. But none of them are available for practical uses. In next section, we are going to introduce the final cooling material, see if it is suitable for LED lamps.

 

Graphite material: due to its special molecular structure, graphite material has a property of anisotropic heat transmission. Graphite has a layer structure, covalent bond structure within each layer and molecular bond structure between layers. The internal-layer construction is compact, having stronger heat radiation ability, while the inter-layers construction is incompact, the heat transmission speed is much lower than internal-layer.

 

In previous sections, we discussed two different cooling materials for LED lamps: porous structured ceramic and conductive plastics.

 

According to its special internal construction, designers usually cut graphite into sheet structure when used as radiators due to its high heat radiation ability in lateral. However, those transmitted heat will be gathered on the side surfaces. How to radiate this part of heat into air is the key potion. Designers have to increase the area of side surfaces, and meanwhile make sure that the middle transversal surface lower than a threshold to maintain the lateral heat radiation ability. Therefore, designers create an approximate cone structure. Although this conical graphite radiator has a very good heat radiation capability, it is unfeasible in practice since that they need a lot of space. The current used graphite radiators in the LED Street Light market are sheet-shaped. They actually just transmit all the heat from middle to both sides. How to radiate the heat on side surfaces is a big problem. After a series of tests, the cooling capability of graphite plate in amazing, even better than aluminum plate. However, they can only maintain this well behavior in a short term. As time passes, their performance will get worse and worse. After ten hours, the heat radiation capability will drop to 30%. Sales of this kind of radiator are not good. In near future, they will be probably disappeared just like porous structured ceramic and conductive plastics did.

 

So far, aluminum plates are the most commonly used cooling materials for LED lights. No matter how many other materials were created or are creating, for a quite long time, we believe that aluminum will still be the main material for radiators.

13 watt led bulb prices decline in March, which slowed down in some areas rebound

LED High Bay inside survey shows that the retail prices  in March of this year does not continue a steady downward trend like the last two quarters. The price to replace 40W LED bulb with 13 watt led bulb is about 7%,the main place is Japan and the United Kongdom. Replace 60-watt LED bulbs in March prices showed 1.6% fell slightly,the average international price of $ 33.

Beside the US, in March 2012, the global price of basic stop faliing in some areas even more substantial rebound. In addition to the exchange rate and other objective factors,  the main reason for the new expensive products on the market is the prices.

To replace the traditional 40W LED bulb, the international average price in March rebounded to about $ 21, mainly due to new product performance led to price increase of 13 watt led bulb, such as full beam emitting angle of the design and sensing. The UK in February has large price changes, average price to replace 40-watt LED Street Light bulbs is more than 30 U.S. dollars, mainly due to the old low-quality items out of the market, while the new items luminous efficiency or beam design leading to higher prices. Furthermore, in addition to other parts of Japan currencies against the U.S. dollar exchange rate fell, resulting in the conversion price relative rising. In South Korea and Germany rose 5% and 6%, respectively, only the U.S. prices continued the downward trend, a decrease of about 2%.

To replace the traditional 60W LED bulbs with 13 watt led bulb, the international average prices continue to fall in March. But slow speed, a drop of only 1.6%. The United States market competition, the decline price is very obvious. The average price has reached 25.6 dollars,  the most price advantages region.  Japan area has no significant change, but because the upgrading of Japan yen exchange rate is eventually resulting in the downslow prices. In addition, South Korea and the United Kingdom in March, the prices were up slightly. Mainly due to the falling exchange rate and the slightly reducing down of the commodity prices.

The United States to replace the 40 watt and 60 watt LED bulb price dropped sharply. The LED light bulb which need to replace 40W lighting fell 19%, the average price has fallen below $ 20, came to $ 18.

Different cooling materials for LED lamps (1)

The commonly used cooling material for electric devices is aluminum. In some special cases, copper is also used, like CPU. Copper better than aluminum in capacity of heat-transmission but worse in capability of heat radiation. Compare two radiators with same construction but made by different materials, radiator made by aluminum are better in natural cooling. However, if cooling fans are taken into account, the result is opposite. Recently, a lot of LED manufacturers tend to introduce ceramic, conductive plastics and graphite material into their LED cooling technique. What are the particular performances of these new cooling materials for LED lamps?

 

The commonly used cooling material for electric devices is aluminum. In some special cases, copper is also used, like CPU. Copper better than aluminum in capacity of heat-transmission but worse in capability of heat radiation.

 

Ceramic: the firstly used cooling material is a type of ceramic with porous structure. The original purpose of this radiator is to raise the coefficient of heat transfer by increasing the surface area. In fact, this method is infeasible. The real thermal conductivity of this radiator is only 15 W/(m oC), even lower than alumina (a commonly use ceramic material for cooling technique). Thermal effect of it is much worse than the aluminum plate. Thus this oldest ceramic cooling material exited for a very short time and disappeared thoroughly.

 

Conductive plastics: this is a new LED Street Light cooling material turned up in recent years. If you study specifications of this material, you will find it has a very low thermal conductivity (only 15 W/(m oC)). Some plastics have better capabilities of surface heat radiation than aluminum. However, tests results indicated that this cooling material is only suitable for low powered LED lamps. They have very similar working effects with aluminum alloy when used in low powered LED lamps (lower than 2W). For high powered LED lamps, the cooling efficiency is even worse than the material mentioned before. The final temperature of LED PN junctions for a 6W LED Spot Lights (using this type material as radiator) is up to 92 oC. Although some plastics have good capability of heat radiation, but thermal conductivity of them is too low. They absorb those heat generated by LED chips in a very slow rate. If the heat generated by LED chips dramatically exceeds their digestion, they will lose the cooling function completely. Similar to porous structured ceramic, conductive plastics did not exist very long in LED lighting market.

 

These two cooling materials for LED lamps are not competent. In next section, we are going to discuss the performance of graphite material.

wholesale led bulb for led’s future

According to Display Search research,  LED lighting demand will be continued growth in these coming years, also for the wholesale led bulb.
According to DisplaySearch’s latest Quarterly LED supply / demand market forecast report, a variety of market indicators, LED applications, it is expected that the lighting leading the way to 20% in 2010. In 2014, the overall income of the backlight and lighting is expected to be $ 7.2 billion increase from 2010 to $ 12.7 billion. The high demand for LED high bay lighting is the main driving force for this growth.
Fortunately, suppliers have already noted that these trends, and as early as ready to expand production capacity. DisplaySearch predicts the global LED production capacity will reach 227 0 billions in 2013.

wholesale led bulb for led's future
LED-backlit LCD TV in the fourth quarter of 2010, the first quarter of 2011 and the beginning of the second quarter of 2011, high inventory and low sales, resulting in a slight decrease of demand for LED backlighting; We believe that due to seasonal demand, it pick up again, and reaches its maximum in the third quarter of 2011. wholesale led bulb also the same future.

Regional market forecasts of LED lighting Japan in 2011 the world’s largest LED lighting market this year, the country’s market share of 63% in 2011 woulbe be  40% in 2014. Japan’s high investment in LED lighting, mainly due to the efforts of the country’s power shortage and energy-saving energy. Until 2014 will remain the world’s largest LED Street Light lighting market, 2011-2014, the growth rate of the LED lamps in China, North America and Europe will be higher than in other regions. wholesale led bulb would be sold very good in China.

In 2010, South Korea is the world’s largest LED supplier, in 2011, Taiwan get the first place. In 2011, chip size 500×500 of the top three suppliers were the S-LED, LGIT and Epistar, Due to substantial investment in the LED production,  Mainland China has become the biggest dark horse LED supply.
With the rapid growth of the market in the next few years, the price advantage and the right strategy LED suppliers will face a very big challenge. 2011 investment in LED lighting in full swing, excess capacity would increase competition and lead to price fell sharply.

wholesale led grow lights in LED Tunnel Lights

With the growing number of projects of the tunnel, the tunnel construction play an increasingly important role in modern transportation. The tunnel is for a closed space, which natural light can not be irradiated,  in order to ensure continuity and vehicular driving safety of human life, even during the day inside the whole need of artificial lighting, tunnel lighting is an integral part of the tunnel construction. Then what about wholesale led grow lights?

The tunnel lighting is different from the general lighting of the road, with its distinct specificity, and safety considerations are particularly important in the lighting system. Human adaptation and dark adaptation factor should be taken into account in the design of tunnel lighting program, attach importance to the transition section and transition section of lighting design.  The exit of the tunnel due to the adaptation time is very short, usually in less than 1s, so do other processing. I think wholesale led grow lights are the same concept.

 

wholesale led grow lights in LED Tunnel Lights

The general tunnel visual problems of the following:

(1) before entering the tunnel (daytime): great brightness difference of inside and outside of the tunnel, so to see from the tunnel external lighting is very full of the tunnel entrance will see the “black hole” phenomenon.
(2) After entering the tunnel (daytime): Automotive by bright external to enter even if not very dark tunnel, after a certain period of time to see the inside of the tunnel, known as “adaptive lag” phenomenon.
(3) exit of the tunnel: during the day, the vehicle through a long tunnel near the exit, due to the external brightness high to see through the export, the export appears to be a “white hole”, there will be a strong glare, the driver will not feel; night and day on the contrary, see the exit of the tunnel is not a bright hole, but the black hole, so that the driver not see the external road linear and obstructions.wholesale led grow lights are also the same such as LED high bay.

In the daytime, the lighting brightness of the tunnel exit and entrance lighting levels should be higher than the tunnel lighting luminance values; at night, on the contrary, it should be less than the tunnel lighting brightness value, when the street lighting in the tunnels, The surface brightness values ​​within the tunnel shall not be less than 2 times the outdoor brightness values.

how to buy wholesale led lamps?

From market research firm, Strategies Unlimited Tim Carli, they pointed out that  in the short term, LED lamps can not become a viable lighting solutions  in large quantiy. So, how to buy wholesale led lamps?

LED replacement lamps and Prospects in the content essence, an inventory of the market launch in 2009, a variety of LED replacement lamps, and thus proved that the LED replacement lamp into millions of households is not empty chatter.
Strategies Unlimited (www.strategies-u.com) last year published a report, “2009 LED replacement lamps and Prospects “. Through the analysis of five types of LED lights, including type A and dome lights, PAR and R lamps, MR16, chandeliers, decorative lamps and linear fluorescent tubes, the report pointed out that the legal prohibitions issued as countries awareness of the cost of ownership, coupled with customers, these will be the driving force of the LED replacement lamp in the next few years. how to buy wholesale led lamps?

how to buy wholesale led lamps?

Europe, America and Asia will start to accelerate the promotion of the use of LED lighting bulbs, to replace the traditional incandescent bulbs. European regulations came into effect from September last year to prohibit the use of 100W or more incandescent light (clear glass lamp); and between now and 2012 will gradually ban all inefficient incandescent 2016 turn all incandescent lights. Similarly, the U.S. Energy Information and Security Act 2007 banned the sale of inefficient light bulbs in the United States in 2012, this rule will be without deepening into “Where inefficient light bulbs will not sell”. The previous few years, Australia and other countries have announced the incandescent ban.

Therefore, the current situation is favorable for the LED replacement lamps, with the falling cost of LED lights. Among the entire market in constant growth, governments and consumers are looking for continuous improvement of energy saving solutions to reduce design and manufacturing costs, customers will eventually accept the cost of LED Street Light slowly.
Commercial LED performance in recent years has made leaps and bounds, product prices have decreased significantly, it will be possible to design a high luminous flux LED lights, its cost of ownership with other lighting technologies compared. how to buy wholesale led lamps?

LED replacement lamps in the short term as a viable lighting solutions, government departments, continues to inspire the CFL. However, within the next five years, LED technology is relatively CFL’s advantage will be presented one by one. Well-designed LED lights, the effective number of lumens can compete with CFL very soon.

Analysis for new cooling material for LED chips

Copper is the oldest cooling material for LED chips. In the beginning, LED Street Light chips are fixed on copper bases. Since copper has very good thermal conductivity, heat generated by chips can rapidly transfer into cooling devices. Even now it is still the best packaging material for chips. However, in the early stage of LED lighting, copper bases cannot be well connected with cooling devices directly. Most heat generated by LED chips gathered on copper bases, cannot be further transferred into cooling devices. In order to solve this problem, aluminum plates were set between copper bases and cooling devices. Due to this problem, aluminum was wildly used later in LED Tubes packaging. Then designers installed LED chips directly on aluminum plates. This packaging method is the prototype of COB.

 

Copper is the oldest cooling material for LED chips. In the beginning, LED chips are fixed on copper bases.

 

In next few years, a new cooling material for LED chips started to emerge: ceramic. Ceramic used for LED packaging should have better insulating capability and higher thermal conductivity. Currently, there are three types of ceramic material are competent: alumina, aluminium nitride and beryllia. Beryllia is toxic. Aluminium nitride has a very high thermal conductivity in theory but is not. In practice, the measured maximum thermal conductivity value of aluminium nitride is approximately 150-200 W/(m oC), very closed to the thermal conductivity of aluminum alloy. Since aluminium nitride is much more expensive than aluminum alloy, this material is also unsuitable for LED lighting. The thermal conductivity of alumina can be various depending on the constitutions of them. 95% purity has a thermal conductivity of 21.8 W/(m oC) and 36 W/(m oC) for 99% purity. It is much lower than aluminum alloy, not mention copper. But ceramic is isolated. In order to realize the function of cooling along with isolation, designers have to utilize this kind of material at the cost of thermal conductivity. Ceramic are fragile. When LED products subject to strong vibrations and pressures, they will be easily destroyed. Meanwhile, ceramic has much lower coefficient of thermal expansion than copper and aluminum. When there is a large change in temperature, ceramic base will generate a stress to destroy LED chips.

 

Above all, copper is the most suitable material for cooling system, then aluminum alloy. Only when insulation needs to be concerned, ceramic material and will be used.

why led lighting is better?

With energy saving, environmental protection, long life, small size and other characteristics, LED High bay now can be widely applied in various directions, display, decoration, backlighting, general lighting and urban night. LED with solar panels in the field of road lighting effective combination to create new markets for photovoltaic applications and LED combination.  However, if we want the solar LED to achieve large-scale application, we must resolve issues such as cost, standard. why led lighting?
The LED lighting market prospect is very broad,  It is estimated that 30 percent of the world’s street lights will be turned to the use of solar LED integrated lighting system can save 460 billion kwh of electricity consumption per year. LED lamps will become one of the direction of development, but its performance instability, high cost, short life are still the problems to be overcome. Promotion in recent years, the solar LED lights, solar and LED lighting to find the point of integration. Solar LED street lights solar panels and a dedicated battery, while the ordinary sodium lamps replaced with LED lamps. why led lighting?

why led lighting is better?
Solar street light take the control of a distributed circuit, the lights off, the energy conversion used in all the intelligent control, without manual operation, thereby reducing maintenance costs.
Solar LED street lights, compared with the high-power LED, low power LED costs are also full of advantages. Power consumption of high-power LED, matching the area of ​​solar panels increases the capacity of the battery, and therefore costs. The low-power LED street lights only
2/3 of the cost of high-power LED street. Compared with high-power LED lighting systems, low-power LED lighting systems could save 40% heat sink materials. In addition, ultraviolet and infrared spectra of small power LED, heat and radiation, is a typical green lighting. why led lighting?

Also, single power LED does not light, does not affect the normal light-emitting panel other diode when the circuit board due to fatigue or other reasons can not continue to use. You can replace the entire board, easy maintenance and reduce costs. Reporters told that the data show that in 2010 to install 220,000 solar power LED lights, the use of a large number of aluminum. If using low-power LED as light source, you can save aluminum ingots 39,600 tons.

LED white light created by LED chips and fluorescent powder

There are two methods for producing LED white light: LED chips together with fluorescent powder; combination of multi-single-color LED chips.

 

Blue-ray LED High Bay chips with fluorescent powder is the most commonly used method to generate white rays. With current fluorescent powder technique, man-made LED white rays still have big differences with natural white rays. That is the reason why white LED lamps usually have low color rendering index. Feature below shows the light spectrum distribution. From it we can see that the blue-green rays and red rays are insufficient. However, the blue rays are excessive. R9 (color rendering index for crimson) = 0.

 

Many people raised doubts about this colorimetric method. LED lighting sources have discrete light distributions while colorimetric method is typically used for testing continuous light spectrum. However, those who hold such views misunderstand the lighting principle of this LED white light. The lights emit by fluorescent powder (after being stimulated by blue rays) are not single-color rays, but contained most of visible lights. In fact, no matter what type of spectrum distribution, if it has a spectrum distribution very closed to natural white rays, it has a very high color rendering index.

 

There are two methods for producing LED white light: LED chips together with fluorescent powder; combination of multi-single-color LED chips.

 

Some people also come up with the concept that LED white light must have a relatively high color rendering index, since objects under LED white rays will be more bright-colored. However, this view is totally wrong. LED white lights indeed have very strong light intensity within some wavelength region (blue and yellow), but weak light intensity in other regions, like blue-green and red. Therefore, they just make some color of these objects look brighter. In fact, this is a performance of distortion. These objects will have different color if they in the sun. LED white lamps on the one hand excessively reveal some rays, and on the other hand insufficiently reveal some other rays. Some objects will look gloomy under LED white lights, like meat. In some LED-lights-decorated supermarkets, shopkeeper often installed some additional filament lamps in meat region to make their meat look brighter and more attractive.

 

With current technique, the distortion of LED white lamps (LED chips with fluorescent powder) cannot be eliminated. However, with the continuous development of LED Street Light technique, we believe this problem will be solved in future.