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YUJILEDS LED D50 tube light has been selected as the reference light source for the next generation of D50 color viewing for printing matter by the JSPST.
With the discontinuation of domestic production of AAA fluorescent lamps for color assessment in Japan, the Japanese Society of Printing Science and Technology (JSPST) has developed and issued the “Guidelines for Viewing Conditions of Printed Matter Using LED Lighting for Color Evaluation."
In 1998, JSPST issued a recommended standard for viewing conditions in the printing industry (JSPST-1998) entitled 'Methods of observation of transmissive, reflective copies and printed matter', which proposes a method for viewing printed matter. This standard states that the illumination source for observation should be CIE daylight D50, that the color rendering index Ra should be 95 or higher, and that the special color rendering index Ri should be 90 or higher. As a conventional light source meeting these standards, AAA fluorescent lamps for color assessment have been used extensively in the printing industry for many years.
AAA fluorescent lamps for color assessment have been used for a long time as a lighting source that meets this recommended standard. However, the application of LEDs in various lighting applications is progressing rapidly due to their excellent characteristics of energy efficiency and long lifespan and the active promotion by the Japanese government. In the field of color evaluation, starting around 2017, several companies have successively launched LED products for color evaluation. These LED products are manufactured with reference to the standard JSPST-1998. However, JSPST-1998 is a standard specified with fluorescent lamps, so it is not clear whether it is still applicable to LED light sources.
Therefore, JSPST and the Japanese Society of Lighting Engineering conducted verification experiments on the products of 11 outstanding lighting companies in the Japanese market. UniPo, the Japanese subsidiary of YUJILEDS, was one of the cooperative companies involved in the experiments and is the only company to provide LED light source compliant with the ISO3664:2009 international standard. Based on the test results, JSPST developed and published the " Guidelines for Viewing Conditions of Printed Matter Using LED Lighting for Color Evaluation", and UniPo’s Yuji LED color viewing D50 tube light was evaluated as having passed the standard.
JSPST published an explanatory booklet detailing the outline and results of this validation experiment and the reasons for adopting these standards. The organization also held a seminar to help those involved deepen their understanding of this guidelines.