LED Lights Maybe Use As A New Carrier Network Transmission

The researchers of a Germany Applied Research Institute will combine wireless networks and optical, then LED lights can use as a network device in ordinary living room to help user's smart phone or computer to receive or send data. Allegedly, This technology research can make use of flashing LED lights transmit data from the air. The transmission speeds can reach up to 1,000 megabytes per second. And in three different colors of LED lighting to express different transmission data rate.

The Institute's researchers said that they personally thought that the first test of the technology will be put to use in meeting room, exhibition, industrial production environment as well as hospitals and other places which is more professional.

But they also said that such technology will lead to a series of prombles. For example, if the LED lights are use battery powered, which means that within a short range of the received signal will be better. Another problem is that the strong sunlight will affect the LED light signal receiver, which is used in outdoor LED apparatus will having some damage. As the distance changes, its performance will change, out of the range of 20 meters can only at speed of 20 megabyte per second s.

In addition, the visible light communication also requires line of sight communication conditions, after all, the light can’t penetrate walls with functional. But  to coordinate all LED lights inside the house, you can still received signals from any corner of the room.

The limitations of this research is that not every user wants must have a head glowing LED lights when they are using phone or computer to receive the signals, But the research team said that will research and developed invisible infrared LED light in the future.

DO You Know Your Kids Is Under Light Pollution?

Some people afraid of the dark, usually love to sleep with the light, there are also some people used to spend long night with lights, because they work at night and involuntarily, some people even prefer the night life under the light. However, it will bring various injuries to our body.

1.       Increased risk of cancer

Miss Martin of 24 years old, due to opened a shop on her house. She often fall asleep in lights and noisy, gradually develop a "with light sleep" habit. Many friends have told her that this is a bad habit, "easy to get cancer.". "Will get cancer" this argument let sleep with the light from childhood of the Miss Martin surprised. In fact, "with light sleep" does have evidence that may be carcinogenic.As night fell, a variety of complex light will make people's natural circadian rhythms into a state of confusion. While also inhibiting pineal gland normal secretes melatonin at night. Medical studies have found that normal body will produce approximately 400 tumor cells daily, Inhibiting Lesions by the body's immune system. Once no melatonin, then the body's immune system will decrease, growth of cancer cells and cancer cells damage to DNA will accelerate the pace. As an antioxidant, melatonin can effectively protect DNA from oxidative damage. However, once destroyed, DNA mutation may occur, and even serious there could be cancerous.

2.       Cause Precocious Puberty

Human hormone secretion have circadian rhythms, Such as androgen will reached its highest point at seven or eight a clock on morning. According to hospital experts, clinically, there are many kids who get use in found sleep with the light, or for a long time playing computer, or receive excessive light are prone to precocious. This is because the light exposure is too long, so that reduce the secretion of melatonin. Sleep disorders may cause the secretion of follicle-stimulating hormone in advance, which will led to early development of precocious puberty or sex organs.

3.       Easy to make people’s eyes diseases

Recently the University of Pennsylvania School of Medicine and Children Hospital conducted health survey for 479 children whose aged 2 to 16, found that respondents in the first 2 years if he sleep in a dark room, when they grow up the proportion of myopia is 10%. If they sleep in a room with small night light before aged 2, the proportion of myopia is 34%. If they sleep in a room lit headlights, the proportion of myopia is 55%. There are studies indicate, A person work and live in the white light or lantern polluted environment to for a long time, in addition to myopia, the incidence of cataracts are more than 40%.

4.       Long-term no sleep until midnight will easier cancered.

Medical research found that people who work at night, has a higher risk of suffering from breast cancer and prostate cancer. Medical researchers also believe that when you urinate suddenly turn on strong light lamp, or in a dark place suddenly exposed to strong light will affect sensitive biological clock. So you’d best not to suddenly turn on headlights when urinate, be preferable to use only the glimmering night light illumination.

4 Trends Of White LED Package

1.       The development of new type phosphors

YAG: Ce3 + is a phosphor which was widely used in the earliest white LED technology, but because of its low red component in the emission spectrum, it is difficult to obtain a high color rendering index and low color temperature white LED. On the other hand, the continued development of semiconductor lighting makes people to develop a higher conversion efficiency phosphor. Recently, the engineer of the industry has developed an excellent thermal stability and chemical stability red phosphor which can completely replace the alkaline earth metal sulfides to achieve high color rendering index, low color temperature white LED,

Currently, countries like United States, Japan, is mature in the LED phosphors aspect technology, and hold most important patent. They dominated LED market by the occupation of the phosphor patented.

2.       White LED optical model and development

Phosphors used for white LED, must according to specific needs, such as phosphor particle size, etc. The study of the phosphor focused on the optical properties affect to white led package performance. For example, the light extraction efficiency, color and spatial distribution of light and color quality. In these studies, Using Monte Carlo ray tracing method and optical software simulation of the optical properties of the LED package structure, the phosphor layer is treated as Mie scattering material, Thus, can obtained excitation and emission characteristics of white LED through the optical simulations. However, the phosphor specific scattering properties does not take into consider in simulated, lack of experimental verification.

3.       New phosphor coating methods

The traditional way is use point powder mode as coating method, filled with a mixture of colloidal phosphor in the chip support cup bowl, then heat curing. It is difficult to control the amount of phosphor with this coating method, and because the entire excitation light vary, prone to occur macular or blue spots and other uneven light color to white LED. A famous company proposed conformal coating phosphor coating methods, They flip LED chip surface covered phosphor layer of uniform thickness, improve the stability of the white LED light color. Some companies use a layer of phosphor deposited on the surface of the chip to achieve excitation. These coating methods are applied to the chip in contact with the phosphor. H.Luo and other researchers optical simulation results show that, this method increased back-scattering loss of the excitation light, reducing the light extraction efficiency of the device. With white LED optical simulation depth, phosphor far-field excitation scheme shows more advantages.

4.       Bulk current injection and thermal structure

In order to meet the demand for general lighting high luminous flux, people increased driving power of single chip. Previously 1W high power chip is injected into 3W, 5W, or even higher. This makes the white LED thermal problem getting worse, People use various cooling techniques, such as heat pipes, micro heat pipe, water, air and other methods implemented on the LED heat dissipation.

How To Solve The LED Fluorescent Glare And Flare Problems

In recent years, the strengthening of public awareness of energy saving and LED lighting technology matures, to some extent, contributed to the initial formation of the LED lighting market, and there is a growing trend.

For LED glare problems, the manufacturers have adopted a variety of approaches. Some use of PC mask with brushed, some use of frosted mask, some use of special phosphor materials, etc. However, these methods are not ideal, drawing mask can eliminate glare, but the flare phenomenon is more serious. People who are stay a little longer in this lamp their eyes will fatigue, if long in this lamp, can also lead to eye astigmatism. While use of the mask of cream and frosted will lose large lumens, the effect is bad.

LED lighting is one of the market has a bright future, Insiders suggest in the just formation of this market engineers should not only concerned about the efficiency of LED lamps, the luminous flux and life, but also do not ignore the LED lighting comfort issues.

However, after the adoption of optical films, visual observation feeling each LED is brighter, but not dazzling, the diaphragm made LED fluorescent light become more uniform and significantly wider viewing angle. The working principle of the diaphragm is the hash exposure to the diaphragm above of the LED light source change into a uniform surface light source output. So that can simultaneously solve glare, flare and wider the scope of the illuminated problems. In addition, the film transmittance above 90 is a limited impact on the light intensity.

Using an optical film, not only can eliminate the LED specific flare, but also the irradiation angle can be wider. As the LED fluorescent lamp is two rows or three rows of regularly arranged, so each spot light source emits light that may be has gaps, so that flare is generated within a certain distance. After using the optical film, the incident point source light will evenly spread, and becomes divergent light emitted, so that light becomes very uniform, completely solve the problem of flare.

In addition, LED directional light is very strong, the irradiation angle of about 120 degrees, it is prone to lighting blind. After using optical film, due to the unique optical diffusion film, the light irradiation range can be extended to 180 degrees, which can effectively eliminate the blind spot lighting.

LED lamp which with optical film, you can make use of the same number of LED fluorescent lighting in the same area of ​​space, using the patch LED fluorescent blind spot because there is no radiation, light uniformity, lighting effects are far more than ordinary LED lamp. And the larger the area of ​​lighting required, this advantage is more obvious.

DOE Announced Analysis Report Of LED Lamp Life And Reliability

Recently, the U.S. Department of Energy (DOE) published a analytical report on the solid-state lighting product life and reliability. In the report made ​​clear that the current industry standard there is no perfect way to define evaluation system life of LED lamps.

Up to now, LED industry in the development of testing and evaluation criteria aspects on LED components and systems, has come a very long period of time.

However, as the DOE report said, the LED industry is currently no way to provide a very feasible way to assess the life expectancy of the LED lamp. Although lumen maintenance testing and planning standards have improved, but the drive life and system-level color maintenance is still difficult to quantify.

DOE's new report aims to define the existing standards and planning standards, and analysts pointed out that the existing definition LED lighting performance deficiencies. According to the report, the mainly problem is: Existing methods take lumen attenuation as the sole elimination mechanism of LED lamp, there is no standardized assessment methods to resolve the components in addition to light sources.

IES LM-80 standard defines a test method of white LED components. LM-80 details the lumen attenuation standard, the component colors maintenance and color drift. IES TM-21 standards are still as LM-80 test required 6,000 hours, plus new method of planning life. In addition, IESLM-84 standard will define lumen lamps or lighting level and color maintenance measurement methods. At the same time regulation based on LM - 84 data planning methods of lamps and lanterns life. Thereafter, IES may also add lighting planning approach for TM-28.

The report does not provide a comprehensive lifetime or reliability of measurement and planning solutions. According to the report, with the LED and SSL technology matures, the problem will gradually disappear.

DOE also declare that as the product life expectancy from 30 years to 10-15 years, industry conditions will likely improve. This is because the trend of improving lighting cycles is getting shorter. However, the lighting shortened life expectancy will produce more waste materials, affecting sustainability.

Topics are not covered in the report include the use of mixed color LED or reliance on blue light LED phosphor technology non-contact life and reliability of the lighting effects. Current industry standards such as LM-80 only defines the fluorescence conversion type white LED testing methods. However, other system architectures in some applications are become increasingly popular.

With LED Lights To Achieve 100 Megabit High-Speed Communication?

"Visible light communication" as the use of new communication technologies of LED, which is about to enter the practical stage. LAMPSERVE Chairman Changfeng Koichiro was began to concern the use of LED communication technologies five years ago,then  established the LAMPSERVE in March 2011.

Japan Okinawa Naha LAMPSERVE venture company will conducted the world's first outdoor demonstration experiments to establish high-speed communications technologies. If successfully developed, this technology is expected to enter the market of Africa and Asia which are lack of communication infrastructure .

According to the reported, LAMPSERVE find local cooperative enterprises, to provide the underlying technology and the hardware from Japan, Estonian party responsible for the software development, Finally LAMPSERVE venture company successfully developed for visible light communication transceiver in Estonia.

LAMPSERVE Chairman  Changfeng Koichiro said that one street led bulbs only takes 100,000 JPY , you can build communications equipment for send and receive masages. Allegedly usually ensures that the communication speed can be 100 megabits per second or so.The outdoors visible light communication technology of LAMPSERVE was patented in May of the year. They Scheduled test first in Estonia in September, then carried out in Okinawa.

LAMPSERVE envisage the use of lights as visible light communication tools. . That is installed on a street light LED, it also have communication capabilities. According to the experimental data, about 200 meters can be visible light communication at present

The Entire Process Of LED Power Production Figure

I was invited to visit a LED power supply manufacturer on August 1. After getting the factory boss's permission, I took some pictures of the following.

Materials of LED power

A SMD is necessary for power product! This SMD was generaly purchase from foreign country as its more reliable and high quality. SMD is an electronic component, and is more space-saving more stable then the plug.

This is also the electronic components capacitors, the feet are straight forward before, in order to match the shape of the power, you need to fold it. There are stations on the circuit board, just directly insert and fixed .

This is the circuit board, the surface has been brush paste, ready send to the machine to paste SMD.SMT solder paste can stick the SMD, then will be fed into the reflow soldering up.

This is being SMD placement machine inside, there is a patch behind reflow, directly to the reflow soldering then the job will done.

LED power processing

This is just the power semi-finished parts, you need convey to the machine for soldering.

This is welded, cut Its long legs, you can test

This is the shell of the power, remember the date of made in are printed on!

This is the power of the test system

All be aging, so customers can use more stable and long-lasting power.

LED power product

This a LED power product with no labeling

These are some finished products which have been pass QC

This is the positive of power with labeling.

LED power is looks similar to ballast, but ballast can only be use in fluorescent.

The LED power is wide range of applications,like LED downlights, LED fluorescent lamp, LED lights, LED panel lights, LED tunnel lights, etc.

Explore the reasons for the white LED lamp luminous decay

1.       Phosphor performance at higher temperatures decline

There is sufficient to prove the fact that the temperature rises, does affect the performance and life of the phosphor. Phosphor manufacturers have done a test at a temperature of 80 degree, the phosphor excitation efficiency is reduced by 2%, and restoration after cooling. And this is just a very short time test. This test proof that as the temperature rise, the phosphor performance will decline. As unrecoverable performance degradation, it is a cumulative process that takes some time.

We also often encounter such a thing, after a period of using or aging white LED lamp, it will become brighter. At present, the situation for small power LED, usually occur at 1000 hours. For small power package of the LED, this situation is likely to remain to 2000 hours. This situation may be generated by the following conditions:

1.1   Phosphor and mixed plastic effect, so that the phosphor degradation, under the   temperature of the early stages, the phosphor performance recovery.

1.2   Phosphor and mixed-adhesive effect, improve the performance of the phosphor.

1.3   The initial period of time blue chip performance enhancements.

   In the experiments, at the initial period of time, the white LED luminous flux both increase and decline in the beginning. This situation also have occurred when use the same red chip package by different manufacturers. Therefore, only a short time is difficult to determine the phosphor experimental problems, or packaging materials and packaging process problems. However, in low-power blue LED life test found that the flux rising in the initial period of time is prevalence phenomenon, generally flux increased in 200 hours. While the plug-in white luminous flux increase in 100 hours generally. From this we can infer that the white LED phosphor performance should be the first recession. Small power white LED after a brief luminous flux increase period, the situation is not very optimistic. High-power white LED, is generally in about 100 hours Luminous flux increased, then in less than 6000 hours the state is not steady, as the time goes by, some products have a more substantial flux rise and fall 6,000 hours later, basically started down firmly all the way. general power white LED products have reach the end of life in 15,000 ~ 20,000 hours(luminous decay 50%).

2.       Blue light LED rapid decline

Compared the chip with other LED lights, the blue LED's life is the shortest. Small power plug blue LED at work under the 20mA, the life is between 7,000~10,000 hours. While the small power plug red LED working 8,000 hours under 50mA is not occurred luminous decay. Red LED consume power 1.8 times than Blue LED at the same package, the performance does not deteriorate. Yellow, green LEDs are much longer than the lifetime of 10,000 hours.

From the point of view on the chip material, Blue and green LED chips, mainly different from doped epitaxial materials. Therefore, the extension part of the material structure determines their ability to withstand the high temperature. This should be the focus of the chip to improve.

3.       LED package base and other materials of poor thermal conductivity

For low-power LED, chip fixing bracket materials are generally iron, from the perspective of heat, ferrous materials is bad. Meanwhile, part of the lead frame outside, cross-sectional area is small, this also increases the resistance. White LED light recession, mainly due to heat, and LED thermal path-related materials should be considered.

4.       The impact of UV radiation on the LED

Effects of UV on the LED, mainly impact on the chip material, phosphor and encapsulant. most affected are encapsulated colloidal. General LED will not face to sunlight, only some diffuse reflectance ultraviolet rays will go into the internal LED chip. Therefore, the UV is not a strong role to impact the chip and phosphor.

Specific methods of build high-efficiency LED COB packaging products

As LED packaging technology innovation and implementation of energy saving policies at home and abroad, LED light source used in the lighting field are increasing, new form package Keep on launching. COB is the LED packaging products under this background of the industry. Compared with the traditional discrete LED packaging products, COB has a better heat dissipation ability, high luminous flux of output. We will focus on how to improve the efficiency of COB LED bulb and Looking for ways to meet the core value point of lighting following.

1.       COB has good heat dissipation capacity

When designing the LED encapsulation structure, should as far as possible to reduce the chip junction temperature. COB packaging chip is cooling way of the shortest, the main work can be rapid heat transfer to the metal substrate of the chip, Then passed to the heat sink, so COB have better heat dissipation capacity than traditional discrete components assembly. The current choice of COB metal substrate material selection are copper, aluminum, alumina, aluminum nitride, consider the overall costs, cooling capacity, corrosion, etc., the aluminum is the main choice as the metal substrate to produce COB.

2.       COB can achieve high-density flux output

When we are in the modularization design using the LED usually give light space not much, at the same time hope that there is high enough in the size of the small the brightness of the output, and almost impossible to find the solution on the discrete component LED, of course, some may choose 3535 ceramic or other product which is size small and flux is relatively high, but can't comparable to COB or MCOB high luminous flux of output.  Then the advantage of the COB in the product modularization reflected: help the modularization design and maintain the high luminous flux. COB driver design is very flexible, application side can be combined with the existing driving condition choose COB, suffice many alternatives from Low Voltage to high Voltage.

3.       COB packaging defects

COB has many advantages, but it is not the mainstream lighting of market. We are optimistic about the current COB, at the same time more should see its defects in order to find the reasons for restricting its application. First, COB light is still low efficiency, COB is a flat luminous, cannot have PPA chip side auxiliary light output as discrete LEDs, so will loss a portion of the light. Secondly, COB currently has not standardized form, most domestic manufacturers match the corresponding fixture, drive mode according to their respective partners manufacture COB, the shape of each one without unity, so will limit large-scale use of COB.

4.       Method to enhance COB light efficiency

Due to COB light on the problem of low efficiency, I thought that we should think about the solution from substrate Principle. LED encapsulation of photosynthetic efficiency improvement, like we often speak of external quantum efficiency, how to improve the packaging of products or the whole module flux while as the same as chip. First, the high reflectivity of the substrate material, the chip placement area directly affects the reflectance of the light output, regardless of the copper substrates, aluminum plate, a ceramic substrate, should follow this rule. And it is important  to note that at the time of assembly application COB, substrate shiny surface area also needs to consider, if not on the surface of the light-emitting reflective glass, reflective material should be outside of the shiny surface area. Second, larger particles and micromixer mixing effect degrees of phosphor, high light transmittance of encapsulated silica gel, which is identical with the traditional discrete LEDs luminous efficiency ascension .Third, solid crystal arrangement of the chip and drive mode spacing should be reasonable, under the same power, using the drive current of small programs to avoid excessive heat stays inside the substrate. In addition, when the light emitting surface is a little small, points silicone lens shape on the phosphor surface can not only increase the angle, but also can further improved the light efficiency.

LED cooling substrate design and process analysis

1.       Brief introduction

LED module now is widely used in electronics-related products, with the expanding range of applications and development of lighting systems, from about 1990 high power requirements are rapid rise, especially in the form of white high power. The lighting system is now use  LED Power more than 1W, 3W, 5W even reach more than 10W. Therefore, the thermal performance of heat dissipation substrate has become the most important issues. The main factors affecting LED cooling includes LED chip, chip carrier board, chip packaging and module materials and design, the accumulated heat of the LED and packaging materials mostly dissipated by conduction. So the LED chip substrate and the LED chip package designs and materials has become the main key.

2.       Heat dissipation substrate effect to LED module

Red LED light appear from 1970,then soon evolution to the blue and green. The early mostly use on some signs, such as the directions on the appliances. To the beginning of 2000, the LED's use began to enter another phase as the emergence of white high-power LED. Look like a large-scale outdoor version, a small display backlight. But with the rapid evolution of high-power LED, estimated that from 2010, the automotive lighting, indoor lighting and special lighting demand will increasing. However, these high power lighting equipment are more stringent to the thermal performance requirements. The ceramic substrate is currently the most commonly used in high-power LED of the substrate material which is a high cooling capacity and high heat resistance, air tightness.

However, the ceramic substrates are commonly make of LTCC or thick-film technology on current market. This type of product is subject to the preparation of screen printing technology, makes its alignment accuracy can’t fit more advanced welding. While the ceramic substrates which use of thin-film technology provides a product of high alignment accuracy.

3.       Thermal substrate selection

Traditional PCB substrate material features a highly commercialized, the early development of the LED has a considerable influence. However, with improved power of LED, The LED substrate cooling capacity will become an important feature of the material, therefore, high-performance ceramic substrate has become the main cooling LED substrate material, and gradually accepted by the market. In recent years, in addition to the material properties of the ceramic substrate itself issues to be considered, the metal on the substrate Line width, diameter, metal surface roughness and adhesion requirements on the increase, making a prepared traditional ceramic thick film technology substrate gradually not enough for use, and thus developed a thin-film ceramic substrates, This article will focus on the thick and the thin film process and product characteristics to analyze the differences.

4.       Ceramic substrates

From the traditional PCB (FR4) board, and now the ceramic substrate, LED constantly to the needs of the development of higher power, This stage ceramic substrate metal lines are forming by thick film technology. However, thick film printing alignment accuracy make it impossible to keep up with advances of LED packaging technology. The main factor in the higher power LED element thermal design is the use of flip-chip and eutectic packages Technology. The introduction of these technologies can not only use high luminous efficiency of the LED chip, but also can greatly reduce the thermal resistance and allows engagement is more perfect, so that the overall operation of the power are relatively improved. However, the application of these two bonding method needs to have precise basis for the design of metal lines, position the exposure lithography method for thin-film ceramic substrates becomes the precise circuit design mainstream.

4.1       Thick film printing ceramic substrate

Thick film technology are mostly formed graphic and line using screen printing. Therefore, the integrity and accuracy on the bit lines of line graph tend to increase as the number of printing screen tension changes with significant differences in progressivity. This result will affect the subsequent packaging process on position accuracy. As device dimensions continue to shrink, screen printing graphic size and resolution has its limitations, as the reduced size, screen printing graphics presented in each unit size difference (uniformity) and the metal thickness differences will become more apparent. In order to be able to continue to shrink circuit size and accuracy, LED heat sink substrate is bound to continue to improve production technology. Thus the introduction of thin film technology has become one of the ways to improve, however, only a handful of manufacturers has a mature film metallized ceramic substrate technology in china internal.

4.2       Thin film technology applied to ceramic substrates

The introduction of thin film technology is solved circuit size reduction process. The combination of high vacuum coating technology and photolithography technique, Line pattern size can be significantly reduced, and at the same time meet the precise requirements on the bit line.

5.       Conclusion

We have two different LED cooling substrates to make a difference in the analysis process. Thin film technology ceramic substrates with high equipment and technology. Integrated materials development threshold required, such as exposure, vacuum deposition, development, evaporation, sputtering plating and electroless plating techniques. In the current market scale, film products cost relative higher, but once the market reaches a certain level, they will be reflected in the cost structure, thick film technology on price differences will significantly shorten relatively.

Share a LED light control program Based on ZigBee Light Link protocol

ZigBee Light Control Solution Overview:

The scheme is research and development based on TI CC2530 chip,it uses a smart phone APP interface control,support apple IOS and Android mobile devices control at the same time.  So you can do multiple light control, setting the scene, brightness adjustment, RGB color reproduction conditioning and cloud management mode settings through smart phones and tablet PCs. It replaces the 433MHz, WIFI, Bluetooth wireless technology lighting control solutions. LED lamps which are simply follow ZLL standard protocol compatible can be used.

ZigBee lighting control program key performance indicators:

1.       Remote control distance: 30m

2.       Remote control mode: Smartphone with WiFi (Apple IOS, Google Android)

3.       Operation: APP interface operation

4.       Connection protocol: WIFI, ZigBee

5.       Control mode: Brightness adjustment, RGB color adjustment, scene settings

Block diagram of ZigBee lighting control solutions:

ZLL bulb internal structure diagram

1.       DC power supply all the way to the constant current driver IC, and power supply to the CC2530 chip through LDO.

2.       CC2530 chip outputs four PWM signals to control the output current of the constant current driver IC;

3.       Constant current driver IC according to the PWM signal to control the output constant current drive LED light;

4.       By ZLL wireless network control CC2530 chip four PWM signal output, thereby controlling the constant current driver IC output current to drive RGBW LED light, synthesize different color effects;

ZigBee lighting control design difficulties and solutions:

a.       Software

Due to the lack of professional calibration tool, once the color deviation, it is difficult to adjust; Solution: By analyzing the parameters of LED lamp diagram, the use of software on various parameters appropriate compensation;

b.       Hardware

1.       Bulb shape mainly focus on the customer’s first impression, and the actual cooling effect, and process costs, we may follow compromise on these points.

2.       Circuit design, employee of the industry a few years ago using a constant voltage control LED, the LED in this way compare accelerated aging, so we take a detour early.

3.       RGBW color is based on the flux ratio of 3:6:1 RGB to elect the number of devices or control current, while the selection of the LED have a great relationship, we must take look at the main wavelength R :615-620NM, G :530-540nm, B :460-470nm ratio, of course, to improve the color (color authenticity) can be added to yellow (580nm) to be used in the actual use of different layouts and different LED test be repeated several times finalized.

ZigBee Light Link control terminal:

Support equipment: Apple IOS mobile smart devices, Google Andriod mobile smart devices, Windows Mobile smart devices

ZigBee lighting control solutions figure:

ZigBee lighting control solutions prospects and significance:

Based on ZigBee Light Link protocol LED lights intelligent home control solutions not only improve the lighting control mode, but also to promote the standardization of ZigBee products. Currently, this program respected by the major lighting manufacturers, is in full swing to develop, I believe that in the near future, you can achieve wireless lighting control between those LED lamps from different manufacturers.