Scope and starting point
CCT describes a white-light chromaticity relationship; it does not describe the entire spectrum or color-rendering behavior. Two sources with the same CCT can render objects differently. Keep CRI, spectral information, chromaticity tolerance and the reference conditions separate in the specification.
Selection notes
Use the exact order code and regional configuration. Compare delivered lumens, input power, distribution, CCT, color quality, dimming and installation constraints. Emitter efficacy cannot be substituted for complete-luminaire efficacy. Verify the official photometric file and mounting instructions.
Keep a reproducible record
Save the complete part number, source revision, operating point and the reason for each decision. Keep calculated examples separate from observed results. A measurement report needs its sample identifier, instrument and calibration details, stabilization, ambient conditions, raw record and uncertainty statement. Do not replace a missing value with zero or a typical value with a guaranteed limit.