What a repair actually costs
| Part | Pack price | Per unit | Use |
|---|---|---|---|
| C9 LED bulb | 25-pack $19.95 | $0.798 | Swap a failed or broken bulb |
| C9 replacement socket | 10-pack $10.99 | $1.099 | Replace a cracked or corroded socket |
| Male plug | 50-pack $37.99 | $0.760 | Power end of a cut run |
| Female plug | 50-pack $37.99 | $0.760 | Output end of a cut run |
| SPT-1 zip cord | 250' spool $78.00 | $0.312/ft | Leads and jumpers |
Prices as listed at Christmas Light Supplier on September 27, 2026. Compare these with the cost of a new run: a failed socket on a 50-foot section fixed with a $1.099 socket, against roughly $46.64 to rebuild that section at 15-inch spacing from case-priced parts.
Replacing bulbs
With C9 socket wire, each bulb screws into its own socket, so a failed bulb is a single swap. LED C9 bulbs on socket wire are wired so that one out does not take the rest of the run dark, which makes the failed bulb easy to spot. Keep a 25-pack of each color you use on hand; if you bought a 500-count case for a job that needed 400, the extra 100 are your replacement stock for years.
Match the color temperature when you replace. Warm white, sun warm white, pure white and cool white are all listed separately, and mixing two whites on one roofline is noticeable at night. Write the color on the storage bin.
Replacing sockets
Sockets crack from ladder bumps, UV exposure and freezing water. A C9 replacement socket clamps onto the wire in place of the damaged one, at $1.099 each in a 10-pack. Replace any socket with a cracked body before the season rather than risk a short in wet weather, and unplug the run before working on it.
Re-cutting runs to fit a new roofline
Moving to a new house, or adding a gable, does not mean new lights. Socket wire can be cut between sockets and re-terminated with a male plug on the power end and a female plug on the far end. Two plugs cost $1.52 at 50-pack prices, so turning one long run into three shorter ones costs about $3.04 in plugs.
Plan cuts on paper first. Measure each new section, mark the cut point on the old run between two sockets, and label every finished section with its location. Labeled runs go up faster next year and are less likely to be cut again.
Building your own leads and jumpers
Store-bought extension cords come in fixed lengths, so you end up with extra cord coiled on the roof. SPT-1 zip cord lets you cut leads to the exact length needed. A 10-foot jumper made from zip cord plus one male and one female plug costs about $4.64 in parts. The spool's description lists it as 18-gauge, 2-conductor SPT-1 rated at 8 amps and 960 watts, so keep the total load on each lead within that rating.
Store lights so they last
- Wind socket wire onto a reel or spool instead of bunching it, which avoids kinks and cracked sockets.
- Leave bulbs in place if runs will go back on the same roofline; remove them if runs will be re-cut.
- Keep clips in labeled bins by type. O clips, all-in-one clips and shingle tabs can all be reused if they come off cleanly.
- Store in a dry place. Moisture in plug ends is a common reason a run fails to light the following year.
Repair parts are small orders, and Christmas Light Supplier ships them free and same day with no minimum, so a $10.99 pack of sockets costs $10.99 delivered.