With the rise of global energy and environmental awareness, high-power LEDs have replaced traditional light bulbs and entered general lighting applications, which has become the ultimate market for the LED industry. Although the international LED manufacturers have achieved LED light-emitting efficiency exceeding 100lm/W, Japanese color experts warned that Color rendering plays an important role in LED lighting. If the quantified number of LED color rendering index cannot be agreed with the human eye's viewing results, the chances of LEDs entering lighting applications in the future may not be great.
According to the Japan Color Research Institute, because the type of illumination light will cause a difference in the viewing object, the sensing response of the human eye to three different colors of R, G, and B will change with the light source and the spectral distribution. And produce cognitive differences. It is pointed out that the current lighting industry generally adopts Ra as the average color rendering index to represent the relative difference between the color displayed by a subject under a certain light source and the color under the illumination of the reference source. The higher the Ra value, the more significant The higher the chromaticity, but if the Ra value is lower than 60, it means that the color presented is substandard.
However, it is worth noting that when the R, G, and B white LEDs are irradiated to an object, the difference in color rendering index becomes larger despite the wavelength shift, and the human eye is completely unable to discriminate the difference. The Japan Color Research Institute said that the industry has recently taken further review measures to form two different evaluation index standards, but the new evaluation method has stepped on international mines, especially for the European and American companies that have been using Ra for a long time. Controversy, the working group of the International Lighting Committee of Japan Lighting has decided to propose a new case for the new light source color evaluation method within two years. How to accurately reflect the human eye interpretation experiment has become the focus of international attention.
In the past, LEDs entered lighting applications. Most of the industry only focused on LED luminous efficiency and cost. However, if LED color rendering standards cannot be agreed with the human eye, the specifications of international manufacturers will cause doubts. In addition, the color of camera photography can reflect There are also doubts about the colors seen in the original lighting.
On March 27, 2008, the head of the Japan Color Research Institute pointed out in the "Latest White LED Lighting Technology and Metering Trends Lecture" that the future Taiwanese industry will also face difficulties in submitting data to correspond, and color will become an LED lighting To solve the problem, the color of LED lighting will become more and more important in the future.
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