Light will prematurely age a bottle of wine. Clear bottles are most susceptible to this problem, but ultraviolet (UV) light will penetrate even dark colored glass.
Ultraviolet light will damage wine by causing the degradation of the otherwise stable organic compounds, especially the tannins found in wine. These organic compounds contribute to the aroma, flavor and structure of the wine. Without them your wine would be flat and thin.
Exposure to UV light causes undesirable and irreversible changes in your wine.
Extra care should be given to sparkling wines as they are more sensitive to light than other wines.
Sunlight or exposure to UV
Incandescent or sodium vapor lights are better for a cellar than fluorescent lighting. Fluorescent lights give off significant amounts of UV light.
If you have a glass-fronted refrigerator or wine storage cabinet just remember that glass readily transmits UV.
Summary: Store your wines in a dark place.