Cecil Adams explores the issue of lightstruck beer. I disagree with some of his methodology — he sampled his beers at 35°F for starters — but his conclusions are on the mark:
(1) In this world of mendacity and fraud, at least one ad claim has a basis in fact — brown bottles do protect beer better than green or clear.
(2) Notwithstanding (1), in the war of beer versus sun, don’t bet against the sun.
Read the whole article at The Straight Dope.