Colorado Law states that at least 27% of light must be transmitted through all the windows. Metallic or Mirrored tint is illegal. Basically, the concern is that Law Enforcement must be able to see in the vehicle, should you be pulled over. Aside from the legality of mirrored film, it often interferes with electronic devices such as cellular phones etc.
Tinting within the legal limits will provide shade, UV protection and heat rejection. The common misbelief is that the darker the film, the cooler the interior will be. This isn't entirely true. Many films can be well within the legal limits and provide an extremely high heat rejection.
3M™ Crystalline Automotive window films use
new advanced technology which gives these window films the ability to
reflect up to 97% of the sun's infrared radiation while still allowing
high visible light transmission. These unique films combine low
reflectivity with lightly tinted options so they maintain your vehicles
original appearance and greatly enhance car window views.
Stay Cool and enjoy complete comfort. 3M™ Crystalline Automotive Window Films reject up to 50% of solar heat. The lightest shade of 3M™ Crystalline window film rejects more heat than many of the darkest films available.
Huper Optik dual layer Ceramic films are 100% metal-free, 100% dye-free
which means they will not demetallize or fade. This is world's first
patented nano-ceramic technology Employing patented nano-deposition
technology, the manufacturing process involves multi layers of ceramic
thin films that are coated to form a high performance heat, glare and
ultra-violet light barrier. Unlike dyed or metallized films Huper Optik
Ceramic films will not interfere with radio, satellite or cell phone
signals, will never discolor and will not compromise visibilty. These
nano-Ceramic window films are capable of heat rejection levels that only
a darker conventional dyed or metallic film can match. These window
films have low visible light reflectivity and are a neutral color that
will enhance the overall aesthetics.