Finally, it is important to keep the beer out of direct sunlight, especially if you use clear or green bottles. Exposure to sunlight or fluorescent light will cause beer to develop a skunky character. It is the result of a photo-chemical reaction with hop compounds and sulfur compounds. Contrary to popular belief, this is not a character that Heineken, Grolsch, and Molson strive for in their beer. It is simply a result of poor handling by retailers, and storing them under fluorescent lighting. Other beers like Miller High Life™ don't boil hops with the wort but instead use a specially processed hop extract for bittering which lacks the compounds that cause skunking (and flavor). Brown bottles are best unless you make a point of keeping your beer in the dark.

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