Originally posted by Setec Astronomy
I`m not going to get into a huge argument here, but some of the points you have made are erroneous.
If you look at the window manufacturer chart here you will see that clear glass only has a UV transmission rate of 58%. You may also notice the Low-E glass (which has a sputtered metal coating which has a very low UV transmission), which may be what you were referring to as "films that are so light you don`t even notice them, but they keep out 2-4 times the heat that privacy glass does". I`m not aware of Low-E coatings being used on automobiles.
I`m not referring to Low-E glass, they are not used in vehicles. I`m referring to high VLT films.
This is just wrong. A quote from here "As a general rule, photochromic lenses won`t darken behind the windshield because the glass blocks out the UV rays that cause the lenses to change color."
FYI, pc eyeglasses do not require UV rays SOLELY to darken. I should have worded that differently. Also, windshields do not block all of the UV rays that cause fading. (Copied directly from superiorcarcare.net - "and protect from the UV rays that are magnified through the windshield, and would otherwise speed up aging and catalyze deterioration." This is referring to WG int. protectants.
It gets hot inside your house because the sun is shining on THE WHOLE HOUSE. Your house has MUCH less relative window area than a vehicle. I don`t know if by "curtains" you refer to the filmy transparent kind, but I tend to open my blinds/curtains/drapes during the day, which lets light/heat in and can cause fading over time. This whole house comparison is bogus because stuff in your house isn`t designed to be fade resistant in the same manner your car is, but I don`t worry about it because I have Low-E windows, and I can see out at night, unlike you guys with your dark tints! :p
If you stand in front of the window you can feel the heat coming in. True, your whole house is getting heated, but the insulation in your walls and ceilings should be taking care of the sunlight that ISN`T hitting the window area. I don`t know about where you live or your house, but my house doesn`t climb more than 1 degree an hour without using the A/C. And, yes, it gets up to about 110 here in the summer. If you were to have your windows tinted in your house, you could keep your possessions from fading. But you probably think that flat glass film has to look like something from "Pimp My Ride". Here`s a hint: it doesn`t.
Now you`re telling me that the things inside my vehicle are designed to withstand UV ray damage moreso than things in my house? Do they come injected with SPF40????
What causes fading?
40% UV Light
25% Visible Light
25% Heat
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