I was reading the posts on this subject from January 2008 (http://forums.consumerreports.org/n/pfx/forum.aspx?tsn=1&nav=messages&webtag=cr-38aujohn&tid=4120). I read this local article which explained this phenomenon better than any I've read in the past.
The Headlight Doctor:http://www.fwbusinesspress.com/display.php?id=11310
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