1. What Is Window Tint Percentage?

VLT (Visible Light Transmission) percentage measures how much visible light passes through window tint. The combined VLT is calculated by multiplying the existing window VLT by the tint film VLT, both expressed as decimals.

2. How Does The Calculator Work?

The calculator uses the window tint formula:

Where:

• \( VLT_{existing} \) — Existing window visible light transmission (as decimal)
• \( VLT_{film} \) — Tint film visible light transmission (as decimal)

Explanation: The formula calculates the combined effect of multiple tint layers by multiplying their individual VLT values.

3. Importance Of VLT Calculation

Details: Accurate VLT calculation is crucial for compliance with local tint laws, understanding heat rejection properties, and ensuring proper visibility while driving.

4. Using The Calculator

Tips: Enter the existing window VLT percentage and the tint film VLT percentage. Both values must be between 0-100%.

5. Frequently Asked Questions (FAQ)

Q1: What is VLT percentage?
A: VLT (Visible Light Transmission) measures the amount of visible light that passes through window tint, expressed as a percentage.

Q2: Why calculate combined VLT?
A: When applying tint film to already tinted windows, the combined VLT determines the actual light transmission and legal compliance.

Q3: What are typical VLT values?
A: Factory car windows typically have 70-80% VLT. Tint films range from 5% (limo tint) to 90% (nearly clear).

Q4: Are there legal limits for window tint?
A: Yes, most jurisdictions have specific VLT requirements for different vehicle windows. Check local regulations before applying tint.

Q5: Does VLT affect heat rejection?
A: Generally, lower VLT films provide better heat rejection, but other factors like infrared rejection also play an important role.