Interpretation of Japanese semiconductor lighting standards

Japan's four group jointly formulated the "white LED photometric method for lighting general" as the only for lighting with white light emitting diode (LED) measurement standards, this paper introduces and analyzes its contents for readers and related production and research departments for reference.

White LED standard

With the rapid development of LED technology, has been regarded by many as the new generation of the main lighting source is full of potential, but LED has different characteristics compared to traditional light emitting space, which is suitable for measuring the optical properties of the traditional light source may not be applicable to the LED, such as luminous flux (Luminous Flux), Luminous Intensity (light intensity) and chroma (Chromaticity) measurement, otherwise the measurement precision of LED and accuracy will be a problem. Therefore, the world's major standards associations are revised or new LED measurement standards, but because of the wide variety of LED packaging, the performance is also different, so there are associations for different uses of LED to develop new measurement standards

The International Commission on illumination (Commission Internationale de l'Eclairage; CIE) as an example, the substantial revisions to the original file LED measurement technology of CIE-127 in 2007, but due to a lot of controversy, there are still many problems to be solved and measured, by the U.S. Department of energy (DOE) dominated, with its solid state lighting product promotion process, by the United States National Standards Institute (ANSI) and the North American Lighting Society (IESNA) group consisting of standard formulation, are solid state lighting lamp test standard, (the previous B7 version of the article has introduced), including optical measurement, color measurement and life assessment standards, but these standards is its content is regarded as a whole solid-state lighting evaluation, that is to say, LED monomer cannot by the Standard Specification for measurement.

In recent years, China is committed to promoting the standard of semiconductor light-emitting devices, with the support of the government, the semiconductor light-emitting device testing methods have been introduced, and other relevant standards are being considered.

However, with the white LED standard push in the lighting, the fastest progress the country is Japan, the Japan Institute of lighting (JIES), Japan (JCIE), lighting Committee Jil (JIL) and Japan (JEL) electric ball industry in 2004 has set four groups of common standard "white LED light using the method of lighting general", as the only standard for measuring current for lighting with white LED, the first system has taken the lead in a number of projects have not standardized, such as manufacturing, the standard LED module small light intensity measurement and life assessment methods.

In view of the progress of LED measurement and standard content is still room for expansion, the four group released revised version of this standard on March 2006, and revised the original standard content increase, making a more detailed specification in the chromaticity measurement and luminous flux measurement etc.. However, caution is still based on many parts are placed in part and is not part of the actual standard, however, the standard is still very detailed, standard documents on the stage of international LED can find the standard, this is the content of the most complete specifications. In the current industry is still a lack of appropriate general LED measurement standards, the standard will be a very important reference. The following highlights the important provisions of this standard, as well as the revised version of the supplement section.

The scope of application is limited to white LED lighting

The standard at the beginning of the title, had been declared applies only to white LED lighting, the lighting with white LED that will be the target measurement limit, measurement methods to define and compare with the standard LED can effectively improve the measurement accuracy, and the standard LED content provides very detailed. In the measurement of light intensity, measured in accordance with the standard conditions stipulated by the International Commission on illumination; in the measurement of luminous flux, will use the integral ball (Integrating Sphere) measurement, and increase the color temperature of color, in the revised version (Correlated Color Temperature; CCT), color index (Color Rendering Index CRI); measuring method, and using the principle of integrating sphere as the incident optical system.

This standard is mainly for single LED specifications, but the measurement for light intensity small LED module is also included in the specification for small LED module, it does not necessarily apply to the average light intensity measurement method LED defined in CIE standard conditions.

Clear definition of white LED for lighting

This standard and other LED related standards of the biggest difference in the "white LED lighting" made a very clear definition. According to the standard interpretation of the so-called "lighting white LED" measuring flux or average light intensity of light color, must meet the spectrum (Spectrum) almost covers the whole visible light field, which cannot have the defective part; correlated color temperature in the range (2500 ~ 10000) less than K and the temperature; in 1960 CIE (Uniform Chromaticity Scale uniform color coordinate; UCS), and Planck (Planckian Locus) the trajectory deviation (Duv) should be less than 0.02 of the three conditions.

It is worth noting that, in this definition, RGB three color LED lighting will be excluded from the facts, with white LED, in the standard attachment of interpretation, definition of white LED lighting is a controversial project, in the provisions of the relevant color, because here is for general lighting, so a start with the same degree of fluorescent lamp (correlated color temperature (2700 ~ 8000) is about K) for consideration, but the actual development of reference white LED technology at present, the correlated color temperature