the percentage always means the same thing...the amount of light that will go through the window. so if you ask for 70% they will give you 70%, not mistakingly 30%. 30% would mean that only 30% light can go through the window. 70% tint is much lighter than 30% tint.
i have 5% on my windows.... and ive only been bothered once about it. but it is almost impossible to see out of at night.
the guy that did my tint, i would recomend to anyone, anytime. he does excelant work. next thing i get tinted, is absolutly gonna be done by him. his name is Lee, send him an email and ask him what his prices are,
leeberbs@comcast.net