Picked up my car from the guy who tints cars around my area earlier,he said the percentage of light being let through by the tinted glass on the bocanegra on the rear passenger windows and rear windscreen is definetly letting through far less than 70% light,he reckons its between 20-35% but couldn't back this up fully as his tint measuring device was at another workshop.
I'd still go by what he says though.
I'd still go by what he says though.