I like to use darker bottles for all my brews, it helps to shield against light. I've heard that ultraviolet light can produce hydrogen sulfide in wines, I assume this is the case in meads and beers as well. The new Compact Fluorescent bulbs produce a lot more ultraviolet than the old incandescent bulbs, that's why I keep an incandescent above my wine rack in the basement. I also shy away from stores that store their wine out under CF bulbs.