LED light-emitting surface of the small, narrow light beam and high brightness characteristics decided the particularity of the test, in order to deal with this problem, CIE respectively established the "TC2-45 LED measurement" and "TC2-46 CIE/ISOLED intensity measurement standard" two technical committee. CIETC2 in October 1997-34 group held a meeting in Vienna headquarters, formulate and recommend the CIE127-1997 LED measurement standard, it involves the LED radiometric, photometric and colorimetric measurement. But because the LED high bay 30w technology is developing rapidly in recent years, especially the lighting white LED products, is a lot of problems in the past have not considered. So in 1999 the CIE annual meeting held in Kyoto, Japan, the representative of the developed countries, proposed by CIETC2-34 standards for white LED lighting equipment, the Japanese delegation also presented the general lighting two draft standard of white LED.
In order to develop LED lighting technology, developed countries attaches great importance to the research of LED test methods and standards. Such as the national standard testing institute (NIST) organizing international testing experts to carry out the LED test research, focus on studying the characteristics of LED, the temperature characteristic and failure characteristics testing methods, trying to establish a complete set of the LED test methods and technical standards, in terms of the LED test has been walking in the forefront of the world. Japan set up the "white LED test research committee", specializes in lighting white LED test methods and technical standards. The developed countries in the world in order to take the high ground of the study, LED in LED standards and testing have invested a lot of manpower material resources, in terms of standard pay attention to choose LED characteristic parameters and test method research.
In our country, the semiconductor light-emitting diode test methods there is no corresponding national standards, so often occurred between the manufacturer and user. In recent years, China light association photoelectric device professional branch have organized many times of semiconductor light-emitting diodes (leds) test methods of academic discussion and communication, the industry gradually form a unified understanding, and formulate a unified industry standard SJ/T2355-2005 "semiconductor light-emitting diode test method", products in the industry has played an important role in communication, contrast. The standard is not only adopted the CIE127-1997 "MeasurementofLEDs" method, and combining with demand for the development of white LED lighting power type, increased the parameters such as color feature, junction temperature measuring method, for the development of LED lighting products provides an important basis.
In recent years, many chips or leds of multi-tube combination development also very quickly, and at home and abroad have not specifically for leds, formulate the corresponding testing standards. But as a kind of lighting application products, international electrotechnical commission IEC and lighting CIE has the relevant measurement standards committee. Lighting LED lights at the center of the light intensity and beam Angle can consult IEC61341-1994 standards, national standards GB/same T19658-2005 "the center of the reflected light intensity and beam Angle measurement method" has been completed by zhejiang university trichromatic instrument company responsible for drafting, and put into practice in August 2005. For spectral radiant and color measurement, can consult CIENO. 63 documents and the national standard GB/T7922-2003, etc.
With light biological safety attention, according to the requirements of the international electrotechnical commission standard IEC60825 LED lamp or lamps and lanterns product must be in accordance with the requirements of the similar to the laser device detecting radiation safety. Domestic enterprises are not enough. As domestic more LED products to enter the United States and the European Union and other international markets, will involve more complex radiation safety test problems. For wide beam LED products at present is developing rapidly, the requirements of the IEC standard might be too harsh. For conventional lighting lamp and lamp system, considering the possible damage to the health of human body skin and eyes, the international electrotechnical commission in 2002 adopted the international commission on illumination file CIES009 / E2002 "lamp and the light of the lamp system of security", as a formal standard IEC. In response to the change of the international, our country in 2004, also made the corresponding standard, the standard by the national electric light source detection center and three color of zhejiang university (Beijing) instrument co., LTD., responsible for drafting, and will be released in the near future.
Our LED test enterprises are trying to develop testing instrument
Internationally, the United States, Germany and Japan and other countries in terms of LED testing instrument started earlier, and formed a characteristic. At home, LED the testing instrument is developing very rapidly in recent years, has gradually developed from the LED chip, light-emitting materials, such as LED tube, LED lights and lamps and lanterns industry, each link of the middle and lower reaches of the testing instrument, including laboratory testing instrument for research and development, production line of automatic detection and sorting equipment and instruments used in the quality inspection of the products.
Measurements include: spectrum, luminosity and chroma, radiation, electric parameters, the parameters such as thermal resistance, reliability and life expectancy. In the laboratory research and development and quality testing instrument, basically can satisfy the general needs of the development of LED products in China. Domestic instrument price tend to have larger advantage, only a fraction of imported instruments, the domestic many small and medium-sized LED enterprises to improve the quality of the products in the early years of play a positive role. However, due to some instrument manufacturing technology level and understanding of LED high bay 30w measure gap and measurement results for the instrument between each manufacturer, tend to have obvious difference. Typical cases, such as light-emitting diodes, the axial intensity measurements, common measuring results of comparative difference. For the same LED tube, and measurement results between the two manufacturers could be teens, even dozens of percentage error, far more than the general scope of photometric measurement precision.
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