Color rendering in LED lighting applications caused international controversy

With the rise of global energy and environmental awareness, high power LED to replace the traditional light bulb into the general lighting applications, LED industry market has become the ultimate dream, although the international companies R & D LED luminous efficiency exceeded 100lm/W, but the Japanese color experts warn that the color of the LED lighting plays an important role, if the color quantization digital LED index cannot watch the results agree with the human eye, the future to enter the LED lighting application opportunity will not. Japan Color Research Institute said, due to illumination type will cause differences in reflectivity viewing objects, unchanged, for R, G, B eye color form 3 different wavelength sensing reaction, with light and light distribution and change of cognitive differences. Pointed out that the current lighting industry generally uses Ra as the average color index to represent the objects displayed in a light color, and in the light of light color under the relative difference, the higher the Ra value, it means that the color is high, but if the Ra value is lower than 60, which represents the the color of substandard. But it is worth noting that, when R, G, B were white LED irradiation of an object, although the wavelength shift caused by color index difference is larger, the human eye is completely unable to distinguish the difference. Japan Color Research Institute said that recently the industry to take further measures to review, forming 2 different evaluation index, but a new evaluation methodology has stepped on international mine, especially for the use of Ra value for European and American manufacturers to form a serious debate, the working group of lighting relevant international standard committee Japan has decided in 2 years according to the new, light color evaluation method is proposed for the new case, how to accurately reflect the human eye identification experiments have become the focus of international concern. In the past into the LED lighting industry applications, most only focus on LED luminous efficiency and cost, but if the LED color standard cannot be consistent with human reach international manufacturers product specifications will lead to doubts, in addition, can reflect the color photography of color and lighting to see the original doubts. March 27, 2008, Japan Color Research Institute responsible person pointed out in "the new white LED lighting technology and metering trends lecture", the future of Taiwan industry will also face difficult to put data corresponding to the plight of the color will become LED lighting is bound to solve the problem, the future of LED light color will become more important.

Source: Digitimes