I think California's tint laws are bit stricter and since you are a black guy so it might be smarter to stick within the law... put tints all on except light front, maybe.
I plan to tint mine soon... my state, Florida limits 15% all over except the driver window and front at 30%.
You can check your state tint law at:
Auto Window Tint Laws - TintCenter.com
Yes, I have seen many cars around have darker tints than the FL law requires though. Yet I'm not too sure as if it's rather lax here, I hope lol... would live to tint my driver side with 15% - 20% instead of 30%. That's what ponders me still.