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Two Questions Regarding The CCT

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
E. It is caused by different Lumen efficiency
F. Hard to say, hard to solve
G. It is caused by Camera

The 1st batch of downlight is A, the 2nd batch is like B color. Now customer require to reject all the 2nd batch. But in the contract there is only requirement for the CCT. How to solve this problem?


We are QC specialized in LED Lighting field.

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The measured data of the following products has been approved by the supplier, and will be uploaded and released by Back Morning independently!

Test product category