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If half of a string of Christmas lights is out, it is likely because of a single burned-out, loose, or broken bulb within that section. Long strands of lights often contain more than one circuit, so when one bulb fails, it can cause the entire circuit (or half the strand) to go dark. To fix this, inspect the unlit section and test each bulb to ensure it is tight and functioning properly. Replacing the faulty bulb or repairing a damaged shunt will typically solve the problem.

While most general electricians can repair lamps and light fixtures, it is often better to hire a lamp repair specialist. Many electricians prefer larger jobs, such as fixing electrical systems or relocating fixtures, and may not offer lamp repair services due to the small scale of the work. Additionally, some lamps, particularly antique models, require dedicated expertise that a general electrician might not have. A lamp repair specialist will be familiar with various types of fixtures and can provide a more dedicated service. If you have already hired an electrician for a larger project, you can ask them to look at your lamp, but for a standalone repair, a specialist is typically the best option.

There are a number of reasons that landscape lights burn out, including an incorrectly installed transformer, inconsistent voltage, and burned-out or faulty bulbs. Troubleshoot landscape lighting problems by first determining whether it’s a system-wide problem or an issue with just one light, which will help you get to the bottom of your outdoor lighting woes.

If your lights are shorting out during rain storms or other winter events, you should probably replace them. These shorts indicate electrical issues that could cause serious hazards. Look for outdoor-rated lights with connectors made for rainy conditions to replace them. But if your Christmas lights are new and you want further protection, you can find weatherproof covers to add to the male-end connectors of your Christmas light strings. These can minimize the risk of shorts.