Why Light Affects Wine

Light exposure triggers chemical reactions within wine that can alter its flavour and aroma. This phenomenon, called lightstrike, occurs when UV rays penetrate the wine bottle and interact with its contents, leading to undesirable changes. White wines and sparkling wines are particularly vulnerable due to their lighter colouring and higher exposure to UV radiation through clear bottles.

To prevent light damage, it’s important to choose a proper wine storage solution and minimise light exposure.

The Effect of Lightstrike on Wine

Lightstrike, or "goût de lumière," is a condition caused by UV light interacting with the amino acids and riboflavin in wine. This interaction triggers a series of chemical reactions that release volatile sulphur compounds, which are responsible for unpleasant flavours and aromas.

Symptoms of Lightstrike

• Taste: Affected wines often develop notes reminiscent of wet cardboard, damp wool, or cabbage.
• Aroma: The aromas become muted or exhibit an unpleasant sulphurous scent.
• Appearance: White wines may turn brownish, while reds may lose their vibrancy.

Wines Most at Risk

Lightstrike is more prevalent in wines stored in clear or lightly tinted bottles, such as white, rosé, and sparkling wines. These bottles offer minimal protection compared to darker glass, which blocks more UV rays.

For more on the effects of lightstrike, check out "The (increasing) problem of lightstrike"

The Impact of Natural Light on Wine

Sunlight contains UV rays that are particularly harmful to wine. When bottles are exposed to direct sunlight for extended periods, the heat and UV rays can degrade their contents. Over time, this can result in muted flavours, unpleasant aromas, and even a change in the wine’s colour.

Lightstrike Prevention Tips

• Store wine in dark areas, such as cellars or closed cabinets, to limit exposure to sunlight.
• Use UV-filtering glass in wine rooms or display cases to shield bottles while still showcasing your collection.
• Keep wine bottle displays away from windows, or use blackout curtains to block sunlight entirely.

For more about UV protection in wine storage, check out Sommwine’s guide on protecting wine from UV light.

Ambient Lighting: Balancing Aesthetics and Preservation

Ambient lighting is often used to create a warm and inviting atmosphere in wine rooms or dining areas. However, poorly placed ambient lights can lead to subtle heat buildup or prolonged exposure that damages wine over time.

Pros

• Enhances the aesthetic appeal of your wine display without direct exposure to UV rays.
• Soft, diffused lighting adds elegance to any wine storage area.

Cons

• Can still cause minor heat damage if positioned too close to bottles.
• Requires careful placement to avoid unwanted glare or reflections.

Recommendations

Opt for dimmable LED ambient lighting to balance style and functionality while ensuring your wine is stored safely.

Artificial Lighting: Practical Solutions for Wine Displays

LED Lighting
LED lights are the ideal choice for wine storage as they emit no UV rays and produce minimal heat. Their energy efficiency and versatility make them a popular option for wine cellars, cabinets, and walls. For more on why LED lighting is the best choice for sensitive environments, visit The Society of Light and Lighting’s resource on LED lighting.

Halogen Lighting
‍Halogen lights provide bright, high-quality illumination, but they emit significant heat, making them less suitable for wine displays. If used, they should be positioned far from bottles to avoid temperature fluctuations.

‍Incandescent Lighting
‍Incandescent bulbs offer a warm glow but generate heat, which can negatively affect wine. They are best reserved for ambient lighting rather than direct illumination of wine bottles.

Tips to Minimise Light Exposure

Proper storage techniques can help reduce the impact of light on wine, ensuring its quality and longevity.

1. Use UV-Filtered Glass:
   Install UV-filtering glass doors or panels in wine rooms or cabinets to shield bottles from harmful rays while maintaining visibility.
2. Limit Sunlight Exposure:
   Place wine storage areas away from windows or use curtains and shades to block direct sunlight. This simple step can significantly reduce the risk of lightstrike.
3. Opt for LED Lighting:
   Install LED lights in your wine storage spaces to provide gentle illumination without heat or UV rays. LEDs are available in various tones, allowing you to create the desired ambiance without compromising wine preservation.
4. Pay Attention to Bottle Colours:
   Dark glass bottles offer better protection against light than clear or lightly tinted bottles. For more vulnerable wines, consider additional protective measures like storing them in closed cabinets.

Get tips on "How to Light a Wine Wall"