You can string up to a particular number of LED Christmas lights without issue based on the type of light sets you have and how many are on each string. Some Christmas lights brands, such as Pro Christmas, indicate how many light sets you can string together of certain kinds in the product info section.

The wattage of the lights and number of bulbs on each string, along with the available wattage on your circuit, are what determines how many LED Christmas light sets you can string together. Some LED Christmas lights brands, such as Pro Christmas, indicate the number of light sets that you can string together in the info section of the lights that they produce. For example, Pro Christmas 5mm wide angle conicals can connect a max of 43 sets together. If you’re using multiple identical LED Christmas light sets from a single manufacturer, follow the guidance they provide in their product info if available.

You can also figure how many LED Christmas light sets you can string together by using this formula: multiply the wattage per string by the number of strings you want for your display to get the wattage needed; then divide 210 (this is the wattage that cannot be exceeded by connected UL-listed Christmas lights in 22 gauge wire) by the wattage needed to find the number of light sets you can attach in sequence. If you’re decorating with 20 gauge wire, divide 420 by the wattage needed.

If you’re putting together LED Christmas lights with retrofit bulbs, such as C9 or G50, and base cord, two main factors determine how many Christmas lights can be lined up: the gauge of the cord and the length of the run. The standard for power measurement when decorating with retrofit bulbs and base cord is amperage rather than wattage. We break down amperage allowance for Christmas light electrical cords here so you can learn more about how many retrofit LED Christmas lights you can put together.

Be careful when stringing together Christmas lights and always be sure how many light sets you can combine. Too many Christmas light sets connected together can blow fuses in the light sets or trip the breaker in the circuit where the lights are plugged in. Ensure that the circuit you plug your lights into has the wattage capacity to operate your desired number of lights, and do not exceed 80% of a circuit’s max wattage capacity for safety. You can maintain available power on the circuit by having a dedicated set of outlets where only your Christmas lights are plugged in. If outlets are limited, avoid plugging in power hungry appliances or multiple devices on a power strip into the circuit where plug your lights in.

Find the right set of lights to string together from our selection of dazzling LED Christmas lights to make your next decorating masterpiece with.