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I don't really see the point of doing this testing yourself when brand name automotive window film makers have detailed numbers published on UV/IR/visible light transmission. As far as I'm concerned, if you live in a sunny place like CA, it's a no-brainer, and every single window needs it.
My personal preference is Llumar Air 80 all around, maybe 90 on the windshield. It's cheaper than 3M Crystalline or Photosync, and the 80 is about the optimal level of light transmission for me. I tried Crystalline 70 on the windshield of my FRS and at times I felt like it was hard to see at night.
The difference between having Crystalline 70 or Air 80 and nothing is like night and day.
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