日期：2012年5月14日

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.

 

wired led bulb used for LED Street Lights

 

LED lighting is recognized as the next generation of green and low power consumption lighting technology. Single view from the luminous efficiency, LED light now has to reach and exceed the level of conventional light sources, but due to the expensive cost, they are still blocked in the popularity of LED lighting. As far as I think, wired led bulb cost problem is from the LED heat sink.

wired led bulb used for LED Street Lights

Street lights, long working hours, is considered to be the first choice for LED lighting applications. After the Chinese Government’s actively promoting, the total number of applications of LED street light in China now is leading the world. But the light fades, black lamp failure is widespread, and several hundred million RMB boondoggle. The cruel results of LED street (wired led bulb) show that: LED light source and power dissipation are still the problems which is not resolved. As we all know, LED cooling temperature and power are not very high, belonging to the room temperature heat transfer, heat transfer and talk, the LED heat dissipation is not complicated, involving only a very small part of the heat transfer. The thermal conductivity of heat transfer can use off-the-shelf heat transfer calculation software, a very accurate solution.
Leading to simple LED heat problem is complicated, has not been solved: the knowledge gaps, with the rich heat transfer of knowledge and proven technology personnel. To participate in the study of LED heat (wired led bulb) poorly,  it will cause hundreds of years of human mature transfer knowledge and technology is not introduced into the field of LED heat. Popular in the electronics cooling industry, active cooling, passive cooling, there is no such
terminology in the heat transfer. Only in respect of these terms, we can conclude: in the LED High Bay industry within today’s popular “Heat Transfer” (electronic cooling industry) does not originate from nearly a hundred years old, very mature of heat transfer, but start all over again, by a non- heat transfer to build.

This fundamental basic knowledge of heat transfer is a very important concept, not to be, a focus on industry in general.
This article will focus on heat transfer, cooling to analyze the progress of LED street tragic reasons for the technical level.

 

Properties of LED replacement tubes

Commonly used LED replacement tubes are T8 LED tubes and T10 LED tubes. They are new lighting technologies. However, compare with traditional fluorescent tubes, what are the advantages of LED tubes?

 

LED replacement tubes are the best energy-saving tubes presently. T8 LED tubes with power consumption of 15W can replace 40W-80W traditional fluorescent tubes, and can save more than 60% energy. They have been widely used for commercial purpose and residential purpose.

 

Commonly used LED replacement tubes are T8 LED tubes and T10 LED tubes. They are new lighting technologies. However, compare with traditional fluorescent tubes, what are the advantages of LED tubes?

 

More comfortable: Due to the ultraviolet rays sent out by fluorescent tubes, mosquitoes are usually attracted and gathered around them. Most of them even entered the internal of tubes and died there, leaving countless dark spots and reducing the brightness of tubes. However, LED replacement tubes can eliminate such annoy problem. There is no ultraviolet ray generated by LED lamps. Customers used LED tubes do not have to worry about mosquitoes.

 

Small light attenuation factor: LED tubes applied the most sophisticated manufacturing technique, use SMD 3528 LED chips. The light attenuation factor has been reduced into a lowest level. The average light attenuation after 5000 hours is only 8%. The average light attenuation after 30000 hours is around 30%.

 

Easier installation and maintenance: there is no need to change circuits, no need to modify ballasts, no need to change covers. They only thing that customers need to do is to remove the starter. LED tubes are much quieter than fluorescent tubes. They emit much less harmonic waves, the best lighting device in places where sophisticated electronic equipments are used.

 

Higher conversion efficiency: traditional lamps are always overheated. They generated a lot amount of heat during their work. Because they have a very low conversion (from electric energy to optical energy) efficiency. LED replacement tubes can convert more than 80% electric energy into optical energy, dramatically reduced the waste of energy.

Soft LED Street Light, good for your eyes: traditional tubes work under AC, thus will generate flickers with a frequency of 100-120Hz. Since the frequency exceeds our sense function, these flickers cannot be seen by us, but are actually harmful for our eyes. LED tubes work under DC, there is no flicker phenomenon. This kind of tubes can be in classrooms, libraries, in where students need to spend a lot of time on reading and writing. These tubes can protect their eyes and reduce the risk of myopic eyes.