White light LED lighting era of Japan published measurement standards

After Nichia developed a white LED 100lm/W, luminous efficiency shown is comparable to fluorescent lamp and HID Lamp, Nichia high luminous efficiency of white LED light output is 30mW (when the input current is 20mA) of the blue LED chip. In addition to Nichia, the global LED also active in the development of white LED with high luminous efficiency, such as CREE in 30mW has begun shipping products, is expected to put into 3336mW at the end of 2006 LED, make use of this LED chip packaging industry, has been possible to develop high light efficiency for white LED 100lm/W.

So when the LED into the era of high luminous efficiency, the ability to apply lighting in the field is also expected by all walks of life. White light LED applications, has been expanded from the current mobile phones to large panels, the industry estimated that by 2010, you can use the white LED as the amount of lighting products.

- Japan early measurement standards published while the luminous efficiency white LED, because the industry to continue to improve, but, so far, seems to also can not see a general rule of light industry worldwide as the standard, according to. Therefore, including Japan, Japan Institute of lighting lighting Committee, Jil, and Japanese industrial electric ball at the end of 2004 will jointly develop a new set of guidelines for future lighting with white LED measurement standard, the specification number includes lighting association technology JIES 009, Japan CIE lighting Committee S001, Jil specification JIL 9003, and the Japanese electricity industry will JEL 311 specifications of the ball. At present, some units in Taiwan have begun to refer to this standard as the basis for measurement. This standard is sponsored by the Japan electric ball industry association, technical staff with relevant organizations or industry including small department production, MITSUBISHI electric, Panasonic, Hitachi LIGHTING, TOYOTA USHIO, MELCO, OSRAM synthesis, NEC LIGHTING, STANLY, Matsushita Electric, Toshiba Lighttech, LUMILEDS LIGHTING, Nichia JAPAN, ROHM and so on. Discussion of a white LED device, measuring, and photometric methods for white LED module and the whole beam, the measurement object defined in the lighting with white LED, at the same time by comparing the measured and standard LED, develop standard specification, is the criterion of the future will become JIS Japanese industrial standard. Determination of the project includes CIE average light luminosity, full beam value, color temperature and light distribution characteristics, using white LED value has been corrected by the photometric standard Lamp standard as the basis, not only the single chip LED, multi module even white LED lighting is also used in accordance with the guidelines as measurement basis.

- lighting used LED to measure the basic standard of course, as the lighting of LED, Japan and other industrial electric ball industry has made some basic norms, for example, the definition of the structure of the LED chip and the module, in the color temperature must be CIE 1960 UCS chromaticity coordinates, black orbit deviation radiation in the range of 0.02 in the 2500K10000K, and the spectrum is must fall within the scope of the specification of the visible light and so on. In the CIE averaged LED photometric using the CIE127 standard, that is to say, CIE refers to the so-called average luminosity, from the vertices of LED began to become a vertical line as the light axis, the average brightness, the conic solid until LED is formed on the bottom of the cone in the other life, including LED, input current the input voltage, power consumption has made quite clear definition. The luminescence spectra and optical properties, which must meet the light distribution is uniform, and the structure of the shaft angle in the range. The changes of photometric within 5 degrees and not more than x, the color coordinates, Y color change is within 0.003. This specification also considered early light instability, because the characteristics of LED with temperature and input current and change, so the provisions of the sample must be after 100 hours of constant current work in the 20mA life test, began to measure the action, and provides the specification, test white LED lighting from the start, must until Junction the temperature reaches a certain value, and that the light output has stabilized after the measurement will be started, and the stable time of at least 5 minutes or more. Because the general characteristics of LED and the silicon chip is different, because of the inability to secure wide area of electrode, and includes internal series resistance, and potential appeared uneven distribution and so on, the forward voltage, also because of temperature change. In addition, the amplitude of the ambient temperature must be within 2 degrees Celsius, and does not allow the presence of wind phenomenon, to ensure that the color of the white LED to be measured reproducibility and stability. And when the LED as the standard value and the LED to be measured, the spectral gap occurs, if necessary, the color correction coefficient should be multiplied on the measured value for correction. In addition to the white LED itself condition and measurement environment to do a detailed definition, the group in the measurement principle is described in the photometry is standard, in accordance with the law is specified, the use of measured photometry is the general shape of AA illumination must be equivalent to the JIS C1609 specified in the plan, or meet JIS Z 8724 spectrophotometer. This criterion, a lot of detail defined test conditions and numerical values such as beam CIE averaging LED photometric measurement of the LED light emitting unit size, maximum allowable LED angle measurement range and so on, to provide test or test institutions as the reference.

In addition, the group also provides a number of measurement conditions, but because these methods are complementary nature, it is not included in the measurement of the relevant matters, nor a