If I remember correctly the %light transmission is largely independent of heat/UV reduction. I'd avoid that thought trap.
Legal issues are %LT so know your local tint laws. That said, many states allow up to 50% on the windshield which I've found CRITICAL for glare reduction with all these shitty HID/xenons on the roads these days, especially from lifted micropenis compensating bro-trucks.
I've had Huber, Llumar, 3M and feel they're all roughly equivalent. I think Llumar looks best as the Huber had quite a few imperfections regardless of the talent of my tint shop. I love the way metallic tint looks but hate the RF and cell signal blocking.
When I do it again I'll probably go with 30% Llumar full ceramic on every piece of glass again though I might stick w/ 50% windshield to keep it legal as that's pretty obvious.
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