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California State Regulations

Window Tint Darkness

  • Windshield: Non-reflective tint is allowed on the top 4 inches of the windshield.
  • Front Side windows: Aftermarket film must allow more than 88% of light in, or minimum 70% VLT if combined with factory-tinted windows.
  • Back Side windows: Any darkness can be used.
  • Rear Window: Any darkness can be used.

Window Reflection

  • Front Side windows: Must not be more reflective than a standard window.
  • Back Side windows: Must not be more reflective than a standard window.

 

Source: http://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=VEH&division=12.&title=&part=&chapter=4.&article=