That is not entirely correct. NET visible light transmittance (VLT) is the measure of the total of the window + tint, where FILM is only the measure of the tint applied to the factory window. Since most vehicle windows are factory tinted a little bit (not more than 90% VLT) a NET measure is more practicle since the officier will use a light meter to measure your window+tint if he is going to issue you a citation. It would be hard for him to measure the tint by itself once it was placed on your window. In addition to this most states require a certification from the tinting shop to be placed on the driver's window stating where it was done and what level tint was applied. Most shops do not do this since is not astetically appealing.
I would recommend putting 35% tint on all your windows. This will keep you at the legal level (32% NET) since the factory windows are tinted slightly. I have 35% on my windows as well and it is pleanty dark enough, but I can still see at night. One other thing to consider is your interior color. I have dove/shale interior and that does lighten the appearance of my tint from the outside. If your interior is black the tinting will appear darker from the outside compared to mine.
In the end it is your ride and you should get what you will be happy with. Be sure to find a reputable shop and ask to see some of their work prior to getting yours done. Tinting is pretty easy to do but not every Cleatus and Betsy shop can do it well. (speaking from past experience)
Oh and another thing, it won't matter to the officier if you bought the car with the tint on it or not. You are the one operating the vehicle on public roads. Dealers are supposed to make the vehicle legal for sale in the state in which it is sold (such as putting on a front plate in certain states, or removing illegal tint).
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