月份：2013年1月

led smd down lights in shop applications

China’s National Development and Reform Commission since released the “China phased out incandescent roadmap” the roadmap requirements from October 1, 2012, prohibit the import and sale of 100 watts and above ordinary incandescent lighting, and is expected from 1 October 2016 date, banned the import and sale of 15 watts and above ordinary incandescent lighting, which means ordinary incandescent lighting has been phasing out the dust settles. With the gradual disappearance of incandescent, LED lights  led smd gradually emerge as a new force of energy conservation and environmental protection and well known.

led smd down lights in shop applications

In view of the rising price of fluorescent powder, ordinary energy costs continue to rise, and the upstart LED lights as the lighting gradually into the public view. Since the inception of the LED lights, constantly upgrading its brightness gradually from the G24 LED into the field of LED lighting. LED Downlight slowly from the high-end lighting upstart into the new darling of the application market.

The downlight general used in shopping malls, offices, factories, hospitals and other indoor lighting, installation is simple and convenient for people to love. LED Downlight inherits all the advantages of traditional downlight, heat a small, power-saving and long life and minimal maintenance costs. The early LED Downlight LED lamp beads expensive, the overall cost is very high not acceptable for customers. With the LED downlight chip price reduced cooling technology for LED downlight into the commercial field and laid a solid foundation.

LED Downlight LED lamp bulb downlight housing, as well as power. Downlight lamp beads should be used such as single 1W High Power LED lamp led smd beads, small power should not be used as 5050,5630 lamp beads, small power LED lamp bead brightness is bright enough and light enough strength, and the LED downlight general irradiation vertical distance of 4-5 meters, small power light is strong enough that not enough ground light intensity, and high-power lamp beads, especially the larger integrated light source light intensity became LED downlight manufacturer first. Commonly used high-power lamp beads such as single 1W lamp beads, made Downlight 1W, 3W, 5W, 7W, 9W, the largest general can be made 25W If using a high-power integrated solution can also do higher power.

Decided downlights life mainly of three parts: LED lamp beads led smd, LED heat dissipation the design of the shell, LED power. LED lamp beads manufacturers decided life LED downlight quality chip manufacturers.

 

led display user manual

With the increasing development of LED display industry in China, in the streets of the major cities, LED large screen display gradually increased up people’s consumption level is also growing, LED lighting has been gradually applied to the daily life of the family, LED electronic display not only enhance the image of the city the G24 LED also enrich the cultural life of the people in this regard reflects the pace of development of the LED industry is so fast, while we enjoy the economic benefits of LED electronic screen, with LED electronic display businesses not fully understand LED electronic screen operation and use Notes to lead to shorten the life of the LED electronic display.

Switch LED electronic display Notes led display:

1, the switching sequence:

When the opening screen: first boot after the opening screen.

Off screen: first off the screen after shutdown

(First turn the computer off screen, high bright spot will cause the screen body, led burned lamp, the consequences are serious.)

2, switch screen time interval must be longer than 5 minutes.

 

Computer engineering control software before opening screen energized.

4, to avoid opening screen, because the system’s impact current state of the all-white screen.

5 opening screen, to avoid out of control, because the maximum inrush current of the system.

A computer does not enter the control software and other procedures;

B computer is not powered on led display;

C control part of the power is not turned on.

6, when the ambient temperature is too high or poor cooling conditions, led lighting should be careful not to open the screen for a long time.

7, body part appears very bright and his party, should pay attention to timely off-screen electronic display, the opening screen for too long in this state.

8, often display the power switch trip, to screen body shall promptly check or replace the power switch.

9, checked regularly articulated at the firm. Any loosening pay attention to timely adjust, to reinforcement or update hanging.

10, according to a large-screen display screen body, the control part of their environment and avoid insect bites, necessary to place the anti-rat poison.

Second, the control portion changes, changes Note

1, computer control part of the power cord to zero, the fire can not reverse should be in strict accordance with the original position plug. If any peripherals connected after, you should test the chassis is live led display.

, Mobile computer control equipment, the power should first check the join line, the control panel for loose phenomenon.

3, can not tamper with the communication line, location, length of the flat connection line.

4, mobile if found abnormal short circuit, the trip, the burn line, smoke appeared, should not be repeated energized test, you should find the problem in a timely manner.

Third, the software operating Precautions

led display user manual

Software backup: WIN2003, WINXP, applications, software installation program, database, it is recommended to use a key to restore the software is easy to operate.

Master installation methods, raw data recovery, backup.

3 master control parameter settings, the basis of the data pre-modification

4, familiar with the procedures, operations, and editing.

5, regular inspection, remove the extraneous data

6, non-full-time staff, do not operate the software system.

led gu10 spotlights design

The rapid development of LED technology, the rise of the light efficiency, LED spotlights technology is also fast development. The LED spotlights in almost alternative to traditional halogen-based. Compared with traditional lamps, LED spotlights has significant advantages in energy saving and long life. With the lower cost of LED spotlights, LED spotlights gradually began to spread. This article from LED spotlights technical requirements, specifications and types of common LED spotlights, LED spotlights structure, LED spotlights to buy common sense, and LED spotlights the direction of development of these aspects do brief reflection led gu10.

LED spotlights technical requirements

led gu10 spotlights design

LED spotlights at this stage, mainly to replace traditional halogen-based, most of the relevant safety requirements reference traditional lighting requirements, and in accordance with the characteristics of the LED lights to form a safety certification standards. Currently, in LED spotlights certification, the international community is mainly to European CE and UL certification in North America-based, voluntary certification (CQC) in China.

CE certification contains LVD and EMC, LVD is executed in accordance with the EN60968 standard (will be upgraded IEC 62.56 thousand); perform EMC according to EN55015, EN61547, EN61000-3-2 and EN61000-3-3 standard. In addition, LED lights are usually also need additional reference to IEC 62471, light biosafety testing. In North America, it is usually required UL safety and FCC EMC certification. UL implementation of standards UL1993, UL8750 and UL1310; FCC implementation of standards for the FCC PART15 Subpart B. In China, LED spotlight is a voluntary certification (CQC), perform standard GB24906-2010 (safety) and GB 17743-2007 (electromagnetic compatibility).

In addition, the performance of LED spotlights, there are many other standard requirements. U.S. Energy Star (ENERGY STAR) related requirements; energy certification requirements in China, perform standard of CQC 3129-2010. These requirements are the color temperature of the LED spotlights led gu10, color rendering index, initial luminous flux, luminous efficiency, lumen maintenance, life, center light intensity, nominal power, power factor, and product identification provisions.

The life of many electronic products based on broken to judge, but the LED is a long-life light source can be used for a long time are not bad. But the output of the light flux with time and attenuation, so the industry, generally light decay to 70% of the necessary time to define the life of the G24 LED light source, i.e. L70 is. With advances in technology, the LED light fades more and slow to complete test light fades to 70% of the time it is difficult to do. Exponentially due to the life of the electronic product, the LED is usually done shorter aging, by sampling the light decay data, and then to the exponential function to the projected light decay to 70% of time led gu10.

led driver in LED Lighting Industry

Semiconductor lighting source (here mainly refers to the G24 LED light source) now has quantities into the lighting field, but still a lot of problems, mainly energy efficiency, reliability, quality of light and color, as well as cost. About the content involved in energy efficiency and the quality of light and color is very rich, such as visual comfort, intelligent dimming control, we will not describe this. This article will discuss the major technical issues need to be resolved, attributed to the “three high and one low, high light efficiency, high color rendering, high reliability and low cost technical problems, and achieve low-cost essentially technical problems led driver. Solve the four major technical problems, need to take a series of measures in the semiconductor lighting industry chain, such as the adoption of new technologies, new structures, new processes, new materials, only mentioned here should take the technical route and direction, we want to product innovation in the LED business help.

How to achieve high light efficiency

led driver in LED Lighting Industry

Semiconductor lighting light efficiency, or energy efficiency is an important indicator of the energy-saving effect. LED device luminous efficiency the industrialization levels up to 120 ~ 140lm / W, and made the overall energy efficiency of the lighting can be more than 100lm / W. This is not high, the energy-saving effect is not obvious value of 250lm / W there is a great distance away from the theory of optical efficiency of semiconductor devices. To achieve true high light efficiency, related to all aspects of the industry chain to solve the technical problems, mainly to improve the internal quantum efficiency, external quantum efficiency, encapsulated optical efficiency and luminaire efficiency, epitaxy, chip, package, lamps several a link to solve the technical problems.

1. Improve the internal quantum efficiency and external quantum efficiency

Take the following measures to improve the internal quantum efficiency and external quantum efficiency.

(1) surface roughening, and the non-polar substrate

 

Using nanometer FIG type substrate, the alignment type the FIG type substrate or non-polar, semi-polar substrates growth GaN reduce dislocation and defect density and polarity field influence, improve internal quantum efficiency led driver.

(2) generalized homogeneous substrate

Using HVPE (hydride Liquid Phase Epitaxy) grown on the sapphire substrate Al2O3 GaN, as a mixed homogeneous substrate GaN/Al2O3 of, based on this epitaxial growth of GaN-, can greatly reduce the dislocation density of 106 to 107cm-2, and greatly improve the internal quantum efficiency. Nichia, Cree and China, Peking University in research and development.

(3) improvement of the quantum well structure

Control the patterns of change and the change amount of the In composition, to optimize the quantum well structure is to improve the electron and hole overlap probability, increasing the radiative recombination probability, and adjusting the non-equilibrium carrier transport, etc., to improve internal quantum efficiency.

(4) The new structure of the chip

The new structure requires the chip hexahedral light uses a new technology, a variety of surface roughening at the chip interface, reducing the probability of photon is reflected at the chip interface, and increase the surface transmittance, in order to improve the chip the external quantum efficiency led driver.

 

lumiere led in 2013

2012 will soon be over, and this year for the LED industry can be described as mixed, although in many countries, including China, have begun to prohibit the sale of incandescent, LED lighting sales and scheduled the outbreak, but there has been the closure of many lighting manufacturers chain storm Overall, however, there are manufacturers wreathed in smiles, earn pours LED market this year is a normal adjustment year for the LED lighting market in 2013, with the replace the 40-watt (W) incandescent LED bulbs retail minimum The price has reached $ 10 sweet spot of industry have been optimistic about the overall LED lighting market is expected next year to go warm lumiere led, so the industry to do now is to do a good job of technical reserves and program selection, just waiting for the market outbreak devote. Here, combined with Power Integrations, several major LED manufacturers to talk about the latest release of the new 2013 LED lighting solutions four trends.

lumiere led in 2013

The dimming technology challenges facing the LED lighting applications, very large, due to LED lighting to use more current drive mode, dimmer multi-voltage dimming considerable challenges in compatibility, however, this is also to distinguish the the program merits of a weapon, LED dimming solution in the past, the common dimming range, suddenly lights dimming lumiere led, dimming flashing, seriously affect the user experience, but With the PI and other company-specific programs launched G24 LED dimming is expected to solve, PI latest LYTSwitch IC has excellent dimming performance can be achieved, even in low conduction angle can easily reach NEMA startup speed of SSL6 standards, another of the drive is very fast, usually less than 500 milliseconds, even if 10% of the amount of light output is turned on its startup speed is also fast, the actual program, the use of the bulb LYTSwitch IC design able to off almost the same as when dimming the angle of conduction, which virtually eliminates suddenly become brighter. Furthermore, the dead zone in the SCR light is eliminated, this is because the LYTSwitch controller can ensure that when the dimmer is a start working immediately dimming. In this regard, the PI-called proprietary circuit technology from dimming curve, PI program does advantages are obvious.

single-stage circuit architecture gradually occupy the mainstream
In the previous program, in order to obtain better dimming characteristics, many solution providers adopt the two-tier structure, namely PFC (power factor correction) + isolated DC / DC converter architecture, this design can effectively reduce power pattern wave, because the designers believe that the single-stage PFC circuit ripple is too large, the fear arising from the life of LED luminous efficiency and color temperature, therefore, the use of two-stage circuit more, and now, with the single-stage high switching frequency the launch of the program, the advantages of the single-stage circuit is very obvious, because in terms of efficiency, two-stage circuit is difficult with a single-stage confrontation, several vendors can be a single-stage program to do more than 92% efficiency, two-stage circuit lumiere led, usually Only about 85% efficiency.

 

led gu10 special base standard

As LED technology continues to mature and costs continue to decrease, LED spotlights have been widely applied to a variety of places. The development and popularization of LED spotlights facing many problems, how to develop a cost-effective LED spotlights, how to solve the heat dissipation problem of high-power, high flux LED spotlight, how to achieve modularity and interchangeability of LED spotlights, how to fully embody the LED Tubes long-life, high luminous efficiency led gu10, controllability characteristics, so that people enjoy the colorful lighting and access to more affordable, more secure and reliable LED products, also requires the joint efforts of the manufacturers and industry professionals.

Maturing security certification

led gu10 special base standard

Mostly refer to the traditional lighting LED spotlights the safety requirements, and based on its own characteristics, and the formation of a set of safety certification standards.

Most of the safety requirements of the current LED Spotlight reference to traditional lighting, and according to the characteristics of the LED lights to form a safety certification standards. Currently, in LED spotlights certification, the international community is mainly to European CE and UL certification in North America-based, voluntary certification (CQC) in China.

CE certification contains LVD and EMC, LVD is executed in accordance with the EN60968 standard (will be upgraded IEC 62.56 thousand); perform EMC according to EN55015, EN61547, EN61000-3-2 and EN61000-3-3 standard. In addition, LED lights are usually also need additional reference to IEC 62471, light biosafety testing. In North America, it is usually required UL safety and FCC EMC certification. UL implementation of standards UL1993, UL8750 and UL1310; FCC implementation of standards for the FCC PART15 Subpart B. In China, LED spotlight is a voluntary certification (CQC), perform standard GB24906-2010 (safety) and GB 17743-2007 (electromagnetic compatibility) led gu10.

In addition, the performance of LED spotlights, there are many other standard requirements. U.S. Energy Star (ENERGY STAR), energy certification requirements (implementation of standards for CQC3129-2010), these requirements are LED Spot color temperature, color rendering index, initial luminous flux, luminous efficiency, lumen maintenance life, the center beam intensity, nominal power, power factor, and product identification provisions.

Life is damaged in many electronic products to be judged, but the LED is a life-long light source, use a long time are not bad. Since the output of the luminous flux attenuation over time, so the industry, generally light decay to 70% of the time required to define the life of the LED light source, which is L70 is. With advances in technology, the LED light fades more and slow to complete test light fades to 70% of the time it is difficult to do. Exponentially due to the life of the electronic product, the LED is usually done shorter aging time by sampling the light decay data led gu10, and then to the exponential function to calculate the light decay to 70% of the time.

high lumen rgb led

The visible light emitting diode (LED) to both high efficiency and long life characteristics. Currently, a wide range of their applications. Manufacturers have in-depth study of the LED devices have been developed with higher luminous flux, longer life, more colors and more lumens per watt of new devices. Accurate and cost-effective testing is essential to ensure the reliability and quality of the device high lumen rgb led.

high lumen rgb led

LED test with a different type of test sequences in various stages of production, such as the design and development phase of the test, wafer-level testing of the production process, and packaged final test. LED Tube Light test generally contains electrical and optical measurements, this paper focuses on the electrical characteristics of the analysis, the only part of the optical measurement techniques introduced in the appropriate position. Figure 1 shows a typical diode electrical I-V curve. The complete test should contain a large number of voltage values ​​corresponding to the current operating point, but under normal circumstances, a limited number of sample points sufficient to test the quality factor of the device.

 

Figure 1. Typical LED DC I-V curve and test point

Many tests required to provide a known current and measuring voltage, while some tests need to provide the voltage and then measuring the resulting current. Therefore, the high-speed test instrument with an integrated, synchronized source and measurement functions such testing is ideal rgb led.

Forward voltage testing

Forward voltage (VF) test test the LED test sequences, visible LED forward voltage. When the load a forward current in the diode, it begins conduction. Beginning at low current, the voltage drop on the diode rising rapidly, but as the driving current increases, the voltage slope begins to flatten. Diode generally work in a relatively constant voltage region. Diode tested under these working conditions is also very useful. The VF testing need to provide a known current and then measuring the resulting voltage drop in the diode. Typical test currents ranging from several tens mA to a few amps, while the size of the voltage generated is usually in the range of a few volts. Some manufacturers use the results of this test sorting devices, because of the color of the forward voltage of the LED related products (by color or complementary color wavelength and its purity common characterization of color qualityrgb led).

 

smd led heat sink

Traditional thermal conductive material for metals and metal oxides, as well as other non-metallic material, such as graphite, carbon black, A1N, SiC, etc.. With the development of science and technology and the production of many products of the thermal conductivity of the material put forward higher requirements, has excellent overall performance, light weight, chemical resistance, and excellent electrical insulating properties, impact resistance, and easy processing molding . The thermal conductivity of insulating polymer composite materials because of their excellent overall performance is more and more widely used smd led.

However, due to the polymer material is more than a poor conductor of heat, limiting its application in thermal conductivity, and thus the development of new polymer materials with good thermal conductivity, become an important development direction of the thermal conductivity of the material now. Especially in recent years, with the rapid development of high-power electronics, electrical products, is bound to appear more and more heating products, leading to product efficacy to reduce life shortening. Some data indicate that the electronic components temperature is increased by 2 ℃, its decreased reliability 10%; 50 ° C when the life expectancy is only 25 ° C when the 1/6.

smd led heat sink

The heat conductive filler is mainly divided into two: one is a thermal insulating filler, such as a metal oxide filler, a metal nitride filler. Another is the thermal conductivity of non-insulating filler, such as carbon-based filler, and various metal filler and the like. The former is mainly used for electronic components encapsulated materials electrical insulation performance requirements of the occasion, the latter mainly used in chemical equipment, heat exchangers lower electrical insulation performance requirements of the occasion. The type of filler, the particle size and distribution, the filling amount and the filler and matrix interface between the performance of the thermal conductivity of the composite material has an impact smd led.

The thermally conductive plastic using the matrix polymer: PA (nylon), the FEP (perfluoro polypropylene), PPS, PP, PI epoxy resin, POM, PS and PS and PE composite material or the like.

The current domestic and international power LED Flood Light industry lamps commonly used aluminum as a heat sink material of the shell, using thermal plastic shell can save a lot of energy and improve production efficiency, reduce the cost of LED products have a very real economic significance. Use plastic could greatly expand the lighting engineers to develop products Ling and creativity, more lightweight design beautiful products for faster promotion to the mass consumer. Based on the basis of extensive research, we propose to use cooling plastic mold production 8 watts, whether the temperature of the various parts of the 10-watt LED downlight base, check product conform to the requirements for eligibility to test heat plastic for mass production smd led.

osram led in medical use

1 IPL (photorejuvenation)

IPL technology is defined as the use of continuous intense pulsed light the way for non-ablative skin rejuvenation treatment in the low energy density. Within a few short years since its inception in 2000, photorejuvenation technology rapidly growing popularity of the country, has been widely used in major cities, has become one of the primary means to improve skin photoaging, this technology can significantly improve skin wrinkles, texture rough, irregular pigmentation and large pores phenomenon has been recognized many technical professionals and beauty demands. The characteristic histological changes of skin photoaging elastic fiber degeneration and dermal matrix collagen fibers mature obstacles, resulting in the skin laxity and wrinkles osram led.

The study found that the visible to near infrared LED light to penetrate the skin epidermis to reach the dermal layer of photothermal and photochemical effects, prompting the elastic fibers and collagen fiber regeneration and re-arranged, so as to achieve the effect of reducing skin wrinkles, increase flexibility.

osram led in medical use

The prevention or treatment of inflammatory pigmentation

Post-inflammatory skin pigmentation in the skin, the physical and chemical beauty is common, difficult to avoid the phenomenon, particularly apt to occur in Asian populations. For example, in clinical practice to reduce the degree of skin pigmentation after laser treatment generally too strong season to avoid ultraviolet the Zhu Huanzhe avoid the sun, wear sunscreen, but post-inflammatory pigmentation is difficult to completely avoid. In recent years, the study found that of 660nm LED Rgb Lights can prevent or even treat this inflammation after skin pigmentation, which will be a new research focus for skin beauty industry osram led.

3. Promote wound healing

Can be seen in the near infrared band of the LED light can promote the growth of epithelial cells after trauma and promote wound healing. Very good therapeutic effect for the healing of chronic ulcers in diabetic patients with lower extremity.

4. Reduce inflammation

Have series of studies show that the LED having an anti-inflammatory role. The study found that the 635nm LED light can be suppressed gingival fibroblasts release of inflammatory mediators – prostacyclin E2 (PGE2), thereby reducing the inflammatory response of the gums. In the pulsed dye laser treatment of the skin photoaging If the LED light source in advance before irradiation can reduce the dye laser induced skin erythema, swelling, and pain and discomfort. LED light source ahead of irradiation can reduce the side effects of radiotherapy in breast cancer patients before radiotherapy.

5. Scar prevention

Keloid clinical impact of beauty but also difficult kind of skin disorders, the treatment of skin damage caused by connective tissue hyperplasia. Patients often have physical scars. Start small and hard red papules clinical slowly increasing, producing a circular, oval or irregular scar above the leather was a crab-like stretched out skin smooth, shiny, and may be associated with pain, itching and discomfort. Difficulties in clinical treatment, the effect is not ideal. Studies have found that LEDs can significantly improve the patient’s pain, itching and discomfort, the scar flattened, and also has the advantages of non-invasive osram led.

6. Role

In addition, LED can also serve as a non-ultraviolet phototherapy instrument, used for photodynamic therapy, treatment of alopecia, alleviate skin damage after ultraviolet irradiation, and so on.

In short, as a new type of light source, LED has been gradually applied to the skin medicine, with the innovation of LED lamps and medicine the LED mechanism of biological effects research, LED applications in dermatology will have limitless prospects. LED has high security, and can be used as a home medical equipment.

 

 

cree led street lights design

Based on a tight budget considerations, the use of LED lighting can save electricity through less maintenance cycle and power-saving innovations dimming technology.

After the evolution of technology in recent years, LED light output, luminous efficiency and service life has been significantly improved, so more and more attractive to the majority of applications for various other light source in the past, especially street light is can Using the application of LED  technology cree led to be addressed.

cree led street lights design

LED-based street light first in a few years ago in the streets, although they are mainly used to show the design concept or campus test lamp. Yellow phosphor is the only available and stable at the time, one of the phosphor to produce white light output with a blue chip. Most of these lights are cool white G24 LED Light design, color temperature of about 6000K even higher. Unfortunately, most people do not like the cold white light emitted by these street lights, some even complain about the cold white light will bring a cold feeling. Others think the color is pale in the cold white light source irradiation.

LED and phosphor manufacturers heard for the first-generation prototype set feedback, and for street lighting applications developed using more natural, neutral white 4000K color temperature of the new high-brightness output LED. Example, Avago Technologies (Avago) ASMT-JN32-NVV01 will be able to provide a 350mA the 100lm or 700mA current offers light output of 160lm minimum typical 4000K correlated color temperature (CCT).

LM-80 LED lifetime test proposed standard requires the LED light source must have a minimum of 35,000 hours of life, the new high-power LED high junction temperature cree led can reach a minimum of 60,000 hours (L70, B10). View to a daily average of 12 hours (approximately 4400 hours) the use of time, the street lights use the latest LED technology can easily reach 10 years of life without the need to replace the light source.

, Modern LED package has a low thermal resistance of 6 ~ 9 ℃ / W (K / W) from the point of view of product package. This helps as much heat as possible is passed from node to the heat sink. In addition, the light output under different junction temperature very stable at 25 ° C / to the changes in the range of 110 ° C / junction temperature is less than 20% cree led.