Q: How to judge a tested CCT should be acceptable or not? For example, the CCT of a panel is 4000K, while the tested CCT is 3725K by integrating sphere, should it be rejected?
A: ANSI (American National Standards Institute, Inc.) published a standard related CCT of LED lighting in 2015. It’s C78.377-2015 Electric Lamps --- Specifications for the Chromaticity of Solid-state Lighting Products.
SSL products included in this standard shall have chromaticity values that fall into one of the nominal CCT categories listed below.