the windows come from the factory with 70% tint, if you tint them with 50%, you're blocking 50% of the light coming through the 70%, so 50% of 70% is 35%. sorry it's hard to explain
I know mine are very illegal here in Iowa BUT i can get by with it due to a optimamologist note saying my eyes are sensitive to light
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stock 2.4-building a WAI to a CAI 3A Racing muffler- ~Kicker Door speakers and Power Accustic rear speakers 10% tint 18x7.5 Alt Sonix, 2001 GLS sedan