Reading a Film Spec Sheet: VLT, IR Rejection, and UV

A film spec sheet is a sales tool if you can read it — and a source of confusion if you cannot. Here are the three numbers that matter most.

VLT — how dark

Visible Light Transmittance is the percent of light through. Lower is darker. It says nothing about heat.

IR rejection — how cool

Infrared rejection is where comfort lives. A lighter ceramic can reject more heat than a darker dyed film — this is your upsell argument.

UV rejection — protection

Quality film blocks ~99% of UV regardless of shade — a health and interior-protection benefit worth mentioning to every customer.

Sell the right number

Lead with IR and UV, set shade to the law. Software that stores these specs per film keeps quoting honest — SalesThumb.