In order to develop 200W led Flood light technology, developed countries attach great importance to 200W led Flood light test method and standard research. Such as the national standard testing institute (NIST) organization international well-known testing experts carry out 200W led Flood light test research, key research 200W led Flood light luminescence properties and temperature characteristic and failure characteristics of the test method, attempt to establish a complete set of 200W led Flood light test methods and technical standards, in 200W led Flood light test has been walking in the forefront of the world.
Semiconductor light-emitting diode (200W led Flood light ) because of its small volume, light beam transmission, high brightness, p-n junction electrical characteristics etc, thus in the quality evaluation and detection method has many new problems. Different applications, determines the performance requirements of 200W led Flood light products. From the optical performance view, used to display 200W led Flood light , mainly is the brightness, Angle distribution, color parameters. Used for general illumination 200W led Flood light , pay more attention to the spatial distribution of light, light, color, color characteristic parameters, and biological applications of 200W led Flood light , the more concerned about the biological effective radiated power, effective radiation intensity of illumination parameters. In addition, the light emitting diode is not only a kind of light source, it is a kind of power type of semiconductor device, so the quality must be about it from, optical, electrical, and thermal, and many other aspects of comprehensive evaluation.
From the current 200W led Flood light product structure and the industrial development point of view, 200W led Flood light lighting products should be considered the main optical properties, electrical properties, thermal properties, radiation safety and life from the aspects of the parameters.
Optical performance: 200W led Flood light optical performance mainly involves the spectrum, photometric and chromaticity of performance requirements. According to the new set of industry standard "semiconductor light-emitting diode test method", basically have luminous peak wavelength, spectral bandwidth, axial luminous intensity, beam half strength Angle, light, radiation throughput, luminous efficiency and chromaticity coordinates, correlated color temperature, color purity and dominant wavelength and color rendering index parameters. Display with 200W led Flood light , mainly is the visual visual effect, so the relevant color gentle show
Color index does not make the request, and lighting white light 200W led Flood light , the above two parameters is important, it is lighting atmosphere and an important indicator of the effect, and color purity and dominant wavelength generally does not require.
Performance: 200W led Flood light PN junction electrical characteristics, decided in 200W led Flood light lighting applications is different from traditional light source of the electrical properties, namely unidirectional nonlinear conductive properties, low voltage driver and electrostatic sensitive etc. At present the main measuring parameters including positive drive current, the positive pressure drop, reverse leakage current, reverse breakdown voltage and electrostatic sensitivity, etc.
Thermal properties: lighting 200W led Flood light luminous efficiency and power of the increase is the current 200W led Flood light one of the key problems of industrial development, meanwhile, 200W led Flood light PN junction temperature and shell heat dissipation problems appears especially important, generally with the thermal resistance, shell temperature, junction temperature parameters said.
Radiation safety: at present, the international electrotechnical commission IEC will 200W led Flood light products is equal to the requirements of the semiconductor laser radiation safety testing and demonstration. Because of the 200W led Flood light is narrow beam, high brightness light emitting device, considering the radiation may harm the human eye retina, therefore, for different application situation of 200W led Flood light , the international standard for the effective radiation limit requirements and test methods. At present in the European Union and the United States, 200W led Flood light lighting product radiation safety as a mandatory safety requirements execution.
Reliability and life: reliability index is measured in various environment 200W led Flood light normal work ability. In the LCD back light and large screen display of particularly important. Life is to evaluate the quality of 200W led Flood light products available cycle index, usually use effective life or end life said. In lighting applications, the effective life is refers to the 200W led Flood light in the rated power condition, the light attenuation to the initial value of the provisions of the duration of the percentage.
200W led Flood light industry should pay attention to make measurement standard
200W led Flood light luminous surface is small, narrow beam, brightness higher characteristic determines the particularity of the test, in order to deal with this problem, CIE are respectively established "TC2-45 200W led Flood light measurement" and "TC2-46 CIE/ISO200W led Flood light strength measurement standard" two technical committee. CIETC2-34 group in October 1997 held a meeting in Vienna headquarters, set and recommended CIE127-1997 200W led Flood light measurement standard, it involves 200W led Flood light radiation degree, photometric and colourimetry. But because the recent years 200W led Flood light technology developed rapidly, especially white 200W led Flood light lighting products, many problems in the past have not considered. Therefore, Kyoto, Japan in 1999 at the CIE annual meeting, the developed countries, on behalf of the proposed by CIETC2 - and make the white light 200W led Flood light lighting appliance standards, the Japanese delegation also submitted to the general white 200W led Flood light lighting two draft standard.
In order to develop 200W led Flood light lighting technology, developed countries attach great importance to 200W led Flood light test method and standard research. Such as the national standard testing institute (NIST) organization international well-known testing experts carry out 200W led Flood light test research, key research 200W led Flood light hair
Optical characteristics, temperature characteristic and failure characteristics of the test method, attempt to establish a complete set of 200W led Flood light test methods and technical standards, in 200W led Flood light test has been walking in the forefront of the world. Japan has established a "white light 200W led Flood light test research council", special study
White 200W led Flood light lighting test methods and technical standards. The world developed countries in order to take 200W led Flood light the commanding heights of the research, the 200W led Flood light standard and test are invested a lot of manpower and material resources in standard pay attention to choose the 200W led Flood light characteristic parameters and testing methods of the research.
In our country, semiconductor light-emitting diode testing method at present there is no corresponding national standards, so in different manufacturers and users often have a great dispute between. In recent years, China light of photoelectric device professional club has organized many half
Conductor light-emitting diode test method academic discussion and communication, practitioners gradually formed relatively unified understanding, and formulated the uniform industry standard SJ/T2355-2005 "semiconductor light-emitting diode test method", in the industry product communication, contrast
Played an important role. This standard is not only adopted the CIE127-1997 "Measurementof200W led floodlights" method, and combining with lighting power type of white 200W led Flood light development needs, increase the color characteristics, junction temperature and other parameters of the measurement method for 200W led Flood light lighting product development provides an important basis.
In recent years, many chip or more pipe combination 200W led Flood light lamp development is very rapid, and haven't special at home and abroad for 200W led Flood light lamp to formulate relevant inspection standard. But as a kind of lighting application products, according to the international electrotechnical commission IEC and international
Ming committee CIE has already had a relevant measurement standard. The center of the 200W led Flood light lamp lighting intensity and beam Angle can be reference IEC61341-1994 standards, as well as the national standard GB/T19658-2005 "the center of the reflector lamp light intensity and beam Angle measurement method by zhejiang university has three color instrument company responsible for drafting completed, and in August 2005 began to implement. For spectral radiation and color measurement, can refer to CIENO. 63 documents and national standard GB/T7922-2003 execution.
As people light biological safety attention, according to the international electrotechnical commission IEC60825 standards, 200W led Flood light lamp or lamps and lanterns products similar to laser device must, in accordance with the requirements of the radiation safety testing. The domestic enterprise generally do not pay enough attention to. With more domestic 200W led Flood light products to enter the United States and the European Union and other international markets, will be involved in more complicated radiation safety test problems. For the present the rapid development of wide beam 200W led Flood light products, the IEC standards might be too harsh. For conventional lighting lamp and the light system, considering the likely to human skin and eye health damage, the international electrotechnical commission in 2002 adopted the international commission on illumination files CIES009 / E2002 "lights and light system light biological safety", as the official standard IEC. In order to deal with the change of international, China in 2004 also formulated the corresponding standard, the standard by the national electric light source test center (Beijing) and zhejiang university three color instrument co., LTD. Is responsible for drafting, and will, in the near future, official release.
China 200W led Flood light test enterprise is working hard to develop testing instrument
International, the United States, Germany and Japan and other countries in the 200W led Flood light detection instrumentation started earlier, and formed a certain characteristics. In China, in recent years the 200W led Flood light testing instrument is developing very rapidly, and has gradually developed from the 200W led Flood light chip, luminescence materials, 200W led Flood light tube, 200W led Flood light lights and lighting industry, the middle and lower reaches of every element of the testing instrument, including laboratory research and testing instruments, production line of the automatic detection and sorting equipment and the quality inspection of the products with instrument.
Measurement indicators include: spectrum, photometric, chroma, radiation, electric parameters, thermal resistance, reliability and life parameters. In the laboratory research and development and quality testing instrument, basically can meet the domestic 200W led Flood light product development the general demand. Domestic instrument price often have larger advantage, only a fraction of the imported equipment, the domestic many small and medium-sized 200W led Flood light enterprise at the early stage of the product quality improvement play a positive role. However, due to some instrument manufacturing technology level and 200W led Flood light measurement standards, which makes the know200W led floodlightge gap between each manufacturer of instrument measurement results tend to have obvious difference. Typical conditions, such as light emitting diode of the axial light intensity measurement, the widespread of the measurement result can be comparative difference. For the same 200W led Flood light pipe, two manufacturers of between measurement result there may be more than a dozen, or even of of the error of the decades, far more than the general photometric accuracy range.
At present, in 200W led Flood light photoelectric measurement should pay special attention to the following several aspects:
First of all, the standard of measurement
Light emitting diode of optical radiation is actually a kind of orientation imaging beam, so not in accordance with the general rules in the textbook photometric measurement and calculation luminous intensity. That is to say, usually luminous intensity not simple to use detection on the surface of the illumination and distance to calculate the inverse square law. CIE127-1997 "light emitting diode measurement" publications of the 200W led Flood light strength test to determine the average for the concept of strength, and provides unified test structure, including the detector receive the size and distance measurement requirements. This 200W led Flood light to the accurate test than laid a foundation. Although the CIE file is not international standard, but the present has been the international common recognition and use. China's 200W led Flood light industry standard and the CIE file method completely consistent.
Second, photometric the spectral response of the sensor http://www.jujialighting.com/ At present, in 200W led Flood light measuring instrument used in the photometric measurement sensor is to use silicon photoelectric diode and the corresponding visual spectral response correction filter composition. In order to make the detector spectral response function and CIE standard observer spectral luminous efficiency function V (λ) is consistent, it is generally required by more pieces of filter composition. Because of the material and process limit, some instrument sensors in spectral matching there are some differences, when instrument factory scaling used standard source (usually adopts 2856 k tungsten lamp) and the measurement of 200W led Flood light tube spectrum is put in bigger difference, the measurement of 200W led Flood light photometric value can produce significant deviation, and for some monochromatic 200W led Flood light often more obvious. So should use spectral response curve in each wavelength conformity degree better precision photometric detector, or using spectral radiation measurement, and the computer weighted integral, get accurate measurement results. Otherwise, must use 200W led Flood light to real standard instrument calibration and correction, can obtain the result is consistent with.
Third, the direction of the measurement
Light emitting diode emission light directivity is very strong, measuring direction orientation will significantly affect the accuracy of the measurement result. Especially in 200W led Flood light the axial light intensity measurement, some instrument for measuring the direction of the 200W led Flood light not be limited, so it is difficult to ensure accuracy of measurement. In the 200W led Flood light test power drive, 200W led Flood light itself junction temperature rise on the electric parameters and luminous impact should not be overlooked. Therefore, when measuring the environment temperature and the temperature of the device balance is very important measurement conditions. At home and abroad from the existing 200W led Flood light testing instrument to see, basically is for light emitting diode testing requirements. With the development of power type 200W led Flood light to the unity of the test method of the instrument and the requirements, are concerned by more and more people. Many of the established test instruments, the measurement of 200W led Flood light lights for lighting will bring a lot of new problems. Therefore, in the choose and buy and use 200W led Flood light measuring instrument in the process, must according to the kinds of product, the characteristic and the related standard to determine both at home and abroad.
With the rapid development of 200W led Flood light industry, industry shall be according to the requirements of the different stages of 200W led Flood light products as soon as possible, formulate unified test method and standard, form conforms to the actual demand, China's independent intellectual property rights of the testing instrument, so as to facilitate the upper, middle and lower reaches of the industry chain cooperation and coordinated development, promote the lighting 200W led Flood light the market standard and Chinese enterprises to participate in the international market of competition ability raise. It is worth noting that testing instrument is the product quality analysis and judgment, the lever of the accuracy and reliability of the instrument should be the most important indicators. China's equipment manufacturing enterprises, should develop more advanced international testing instrument, and meet the 200W led Flood light lighting industry development needs.