I would definitely try to store your wine in the dark if you can. Your wines are in what I’m assuming are clear glass demijohns and over the year or more aging you might want for the wine, it could be enough to be detrimental to your wine’s quality. Interestingly, it’s not damage to your wine’s color that I would worry about the most; it’s damage to the wine’s aromas and flavors. Clear glass blocks so little UV light that it essentially offers no protection at all. Though indeed high UV light exposure could contribute to premature oxidation of pigments, light can interact with amino acids and other sulfur-containing compounds naturally occurring in wine, resulting in dimethyl disulfide (DMDS) or other aromatic sulfides. These compounds are super stinky; think overcooked cabbage, wet cardboard, or rotten onions. Not aromas you’d really want to have in something you’ve invested so much of your time and effort. This defect is sometimes called “light strike” and is the reason that dark green or dark brown bottles are so traditional as wine bottle colors. Ever
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