A performance number is useful only when its term, method, and sample are clear. Vehicle results also depend on glass, area, air leakage, and sun exposure.
Questions before deciding
Bring vehicle context and usage patterns. Good answers narrow the options and identify the inspection required.
- Which VLT, UV, IR, and TSER values are stated and how they are defined.
- Whether figures describe film alone or a film-and-glass combination.
- Method, wavelength, instrument, and test conditions.
- Balance among heat rejection, visibility, color, signals, and budget.
Useful checks
Use these checks as a starting point for handover. Final scope still depends on the vehicle, product, and agreed work.
- Compare data using equivalent terms and methods.
- Do not infer total performance from one IR figure.
- Test night vision and vehicle-device functions.
- Retain film type, batch where available, and warranty evidence.