Ok so consider me "stupid" to the percentages of window tinting but I live in NY and the law says that the fronts have to be 70%. Now I know when you are talking abou the law having to allow 70% of the light to pass thru.... when you talk about the strength of the tint I hear alot about 20%-35% is the tint really that far off from the written law or does 20% tint = 80% of the light to pass? Does that make sense?
In regards to tint numbers the % is the amount of light that will pass thru the tint.
Example: 20% tint means that 20% of the light will transmit thru the tint.
Also a key thing to remember is that alot of states have regulations on the reflectivity of the tint. Many of them do not allow this type of tint because the officers can not see in the vehicle.
The reflective tints are usually the best ones because they have a metallic layer to them that reflects the heat, but again make sure to do plenty of research into your local laws first.