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"ค่า CRI คืออะไร"
<https://www.toshibalight.com/content/9011/%E0%B8%84%E0%B9%88%E0%B8%B2-cri-%E0%B8%84%E0%B8%B7%E0%B8%AD%E0%B8%AD%E0%B8%B0%E0%B9%84%E0%B8%A3>