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This might help you understand the percentages a bit better. 30% isn't really all that dark but it will look and perform better than having no tint. The lower the %, the less light that gets through.
If the law is 30%, then you probably want to tell your installer to use 35% tint to keep it legal. The factory windows are already tinted at 70% so if you installed 30% tint on top of that, you'd be in the mid to upper 20% range overall.
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