As independent QA of LED lighting, we have to know the raw materials but not only some quality tools. Because we have to give buyer professional suggestions to select the correct item, correct supplier and build a reliable process. Indeed, this is also very much helpful for us to find […]

Q1: These 2 down lights are same Color Temperature, but definitely different colors of light. What’s wrong? A. The test instrument (for Color Temperature) is wrong B. It is caused by different Ra C. It is caused by different SDCM D. It is caused by different X & Y value […]