Window tinting for automobiles, trucks, and recreational
vehicles all have visible light transmission laws that vary from state to
state. Visible light transmission means the amount of light passing through any
piece of glass to the interior of the vehicle. For example a clear piece of
glass would have a 100% visible light transmission.
All of the window film manufacturers of today offer their
products in different visible light transmissions or VLT's which they can be
referred to as well. I will use SolarGard HP Smoke for an example. This
particular window film comes in VLT's of fifty percent, thirty five percent,
twenty percent, and five percent. They do not offer any different light
transmissions in between the ones provided. It is important to note that these VLT's
are all based on 100% clear glass. So for example a 35% visible light
transmission installed on a factory supplied automotive glass with a 75%
visible light transmission would give it approximately a 26% visible light
transmission. So it is important to know the VLT of the glass before the
installation of any window tinting. This can easily be checked with a meter
which slides over the edge of the glass and reads the visible light
transmission. Any reputable window tinting business will have one of these
meters, and I am sure will check your glass for no cost. If one is not
available in your area, and you have trouble attaining a meter they are
available for purchase with a starting retail of eighty nine dollars.
The benefit of having window film that is too dark is very
little. Staying along with our previous example of the SolarGard HP Smoke. The
heat difference between the 50% light transmission, and the darkest available
the 5% light transmission is a mere 10%. So to capture that example the window
film is 45% darker, but only achieving an additional 10% in heat rejection! So
darker does not necessarily mean cooler. It simply means more light is being
taken out.
Most all glass installed in vehicles today have some sort of
tinting to them. It varies from the automobile manufacturer, and the model of
the vehicle. Generally they range from 75% on the front two windows, and as
dark as 15% on the rear doors and back glass. The windshield is only allowed to
have tinting on the top down to the AS1 line marked in the glass or six inches
if the line is not marked.
There are different laws also regarding the location of the
window tinting. They are separated into the front driver and passenger, the
rear driver and passenger, the rear glass, and the windshield. All of these
locations will have different laws and vary from state to state. To check the
law for your state you can see a window tinting chart provided by the
International Window Film Association provided at http://www.IWFA.com
The importance of having legal window tinting is critical.
The reason being if you were ever involved in an automobile accident, and found
to have illegal window tinting you could be held liable for the accident. The
insurance company would claim you were negligent, and that you had an improper
and illegal vehicle unsafe for the roadways. They would then deny the claim,
and you would be held personally responsible for the accident costing you
thousands of dollars in medical and attorney fees. The risk far outweighs the
reward in this case. Especially for the very small benefit of the additional
heat rejection. Some states do have medical exemptions that do allow for the
darker shades be applied. Again check your state law, and be safe.
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