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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.

Costs depend on system type, issue severity, and labor rates.

Testing tools, such as Christmas light testers, non-contact proximity electrical testers, and multimeters, all simplify the process of testing Christmas lights. However, without one or more of those tools, testing Christmas lights the old-fashioned way only works sometimes. Without testing tools, the simplest testing method is visual inspection, which may or may not yield positive results.

Replacing a pool light costs about $625 per light. If you only need to replace the light bulb, plan on paying about $20 to $100 per light. The largest cost factors include the type of pool light, the number of pool lights needed, and the labor costs in your location. But additional cost factors include work required on existing wiring, other repairs, and the continual maintenance needed to keep your pool light in good working condition after installation.