Defect Classification
Meaning ~ System for grouping product errors into severity levels that define if a batch is accepted, reworked, or scrapped based on risk and contract limits.
D65 Light Source
Meaning
Standardized illumination configurations simulate average daylight conditions to allow consistent color evaluations across different production sites. This setting, called the d65 light source, provides a correlated color temperature of approximately sixty-five hundred Kelvin. It applies exclusively to visual evaluation environments and does not replace numerical colorimetry measurements.
Visual Consistency
Color matching requires a uniform environment to prevent the phenomenon where colors look identical under one light but different under another. Using a d65 light source allows inspectors to see the product under the same illumination that the final user experiences. This step minimizes the chance of disputes between the factory and the buyer over shade variations.
Operational Practice
Inspectors place the samples inside a neutral gray viewing booth to eliminate reflections from the surrounding room. Under the d65 light source, they compare the production piece against the approved master sample at a forty-five degree angle. This specific angle prevents glare from obscuring the subtle differences in dye or paint, which protects the integrity of the evaluation process.
Procurement Standard
Quality agreements often specify the lighting environment that the supplier must use during final inspection. If the d65 light source is not used, the factory might ship batches that the buyer subsequently rejects as off-shade. The cost of such color nonconformity is usually borne by the party that failed to follow the lighting standard.