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Originally Posted by bmussatti
Hey Jim:
The test is still valid, and works. I have very new sunglasses and a very new Ford Explorer (rear window). If I turn the sunglasses, I can block out more light, as the polarization become less parallel. Haven't yested in the Porsche, though.
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Hi,
As I said, it may work on some older cars, or companies which still use polarizing as a means to block UV, but this is phasing out.
Polarizing is more expensive to manufacture and it reduces the total light transmitted through the glass which can be especially important for nightime driving.
To help combat this, the glass is generally
less polarized and so the UV protection is more on the order of 75% or so. It's a trade-off between overall light reduction and UV protection.
I too wear polarized Sunglasses and there is no blocking on the Boxster glass, when rotating them as you mention.
Still, your post was thoughtful and very informative.
Happy Motoring!...Jim'99