The documented source, direction, intensity, diffusion, and ambient context of light used during inspection.
GlassRenu · Educational illustration
Meaning and boundaries
A feature seen only under extreme lighting may still matter diagnostically but may not fail the applicable appearance standard.
Why it matters in glass restoration
Controlled lighting makes photographs and before-and-after judgments more comparable.
Related terms
References
- ASTM International — ASTM C1036-25: Standard Specification for Flat Glass
Publisher’s original source - National Glass Association — Guidelines on How to View Decorative Glazing Products
Publisher’s original source - ASTM International — ASTM C1376-21a: Pyrolytic and Vacuum Deposition Coatings on Flat Glass
Publisher’s original source - National Glass Association — Proper Procedures for Cleaning Architectural Glass Products
Publisher’s original source