Understanding the Issue:  

Box wall lanterns installed outdoors can steam up and get condensation after installation in humid weather due to several specific factors:

1. Temperature Difference: Outdoor lanterns are exposed to varying temperatures. During humid weather, the outside air is warm and full of moisture. When this warm, humid air encounters the cooler surface of the lantern, the moisture in the air condenses into water droplets on the lantern's surface. This is especially common in the evening or early morning when the temperature can drop significantly.

2. High Humidity Levels: Outdoor environments often experience fluctuating humidity levels. High humidity means the air contains a large amount of water vapour. When this moist air comes into contact with the cooler surface of the lantern, the air's moisture content reaches its dew point. At this temperature, the air can no longer hold all the moisture, and it condenses on the cooler surface of the lantern.

3. Surface Temperature of the Lantern: The material of the outdoor lantern can influence how quickly it cools down. Metal lanterns, for instance, tend to lose heat rapidly and can become cooler than the surrounding air, particularly at night. This cooling effect can cause the moisture in the warm, humid air to condense more readily on the lantern's surface.

4. Exposure to the Elements: Outdoor lanterns are constantly exposed to the elements, such as rain, wind, and dew. This constant exposure can lead to the lantern cooling down more quickly than if it were protected. After a rain shower, for instance, the lantern might remain cooler than the air temperature as it dries, leading to condensation when the humid air contacts its cooler surface.

5. Location and Positioning: The placement of the outdoor lantern can also affect condensation. Lanterns installed in shaded areas or places that do not receive much direct sunlight may stay cooler for longer periods, making them more prone to condensation when the humid air comes into contact with them.

6. Type of Bulb Used: The type of bulb used in the lantern can significantly influence condensation. Incandescent bulbs generate more heat compared to LED bulbs. This additional heat can keep the lantern's interior warmer, reducing the temperature differential between the inside and outside surfaces and thus minimising condensation. Conversely, LED bulbs emit less heat, which might result in a cooler lantern surface, making it more susceptible to condensation in humid conditions.

How to Help Rectify the Situation:

To reduce or eliminate condensation in your outdoor box wall lanterns, consider the following steps:

1. Use a Different Bulb:  Switching to incandescent bulbs or other higher-heat-generating bulbs can help reduce condensation by keeping the lantern's interior warmer. Ensure that you check the lamp's recommended wattage as suggested by the manufacturer to avoid any damage or safety issues.

2. Apply Anti-Condensation Coating: There are special coatings available that can be applied to the glass surfaces of the lantern. These coatings can help prevent condensation by reducing the surface tension and allowing water to form a thin, even film rather than droplets.

3. Improve Sealing: Ensure that the lantern is properly sealed to prevent moist air from entering. Weatherproof seals or gaskets can help keep humid air out while maintaining the internal temperature.

4. Install a Desiccant: Place a desiccant pack (such as silica gel) inside the lantern. Desiccants absorb moisture from the air, reducing the overall humidity inside the lantern and preventing condensation. Note that this is only a short-term solution, as desiccants need to be replaced regularly.

5. Adjust Installation Location: If possible, move the lantern to a location that receives more direct sunlight. Sunlight can help warm the lantern and reduce the temperature differential, thereby reducing condensation.

6. Inspect Ventilation: Ensure that the ventilation is appropriate and not blocked in any way. This includes checking internal drainage holes, often located at the bottom or bottom back of the lantern. Proper ventilation helps regulate the temperature and humidity levels within the lantern, reducing the likelihood of condensation.

Reassurance and Advice:

At Dusk Lighting, we have observed this issue with a variety of box lanterns over the years, from different designs and manufacturers. Despite being well-ventilated, condensation can still occur initially. In 99% of all cases, the problem has rectified itself over time. We advise turning on the light for as long as possible and combining this with good sunny weather. This combination nearly always resolves the issue.

If the problem persists after six months, please contact Dusk Lighting for further assistance.