HOW DARK CAN WINDOW TINT BE IN CALIFORNIA?

Darkness of tint is measured by Visible Light Transmission percentage (VLT%). In

California, this percentage refers to percentage of visible light allowed in through the

combination of film and the window.
Windshield
Non-reflective tint is allowed on the top 4 inches of the  windshield.   .      
                                                               
Front Side Windows
Must allow more than 70% of light in.

Back Side Windows
Any darkness can be used.
Rear Window
Any darkness can be used.
HOW REFLECTIVE CAN THE TINT BE IN CALIFORNIA?

Similar to sunglass lenses, some tinting film contain metallic elements that help in

reflecting incoming light and reducing the glare and heat generated by visible light.
Front Side Windows
Must not be more reflective than a standard window.
Back Side Windows
Must not be more reflective than a standard window
OTHER CALIFORNIA RULES AND REGULATIONS
Restricted Colors
The tint color(s) of RED are not legal by state law.
Side Mirrors
Dual side mirrors are required if back window is tinted.

Certificate
Requirements
Manufacturers of film do NOT need to certify the film they  sell in the
state.
Medical Exemption
No sticker to identify legal tinting is required.

Medical Exemption
State law does NOT allow medical exemptions that would allow  use
special tint
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CALIFORNIA WINDOW TINTING LAWS