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Old 03-11-10, 02:57 PM   #13
Lex Parsimoniae
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When I said it was way off, I mean way too high.. I think the exiting light losses might be much less than 10%..

Here's an URL Understanding Energy-Efficient Windows - Fine Homebuilding Article

I skimmed it fast, but didn't see any number associated with light going backwards out the window..

Hey, those look like my Low-E windows!!
Just looking at that picture, it seems intuitive that what Sunlight comes in the window, stays inside..
Expect for the regular cold air leaks and low R-factor window leakage..
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