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How many string lights can be on one outlet depends on a number of varying factors, including the total wattage of your circuit, the type of lights, the energy needs of the lights, and cord specifications. It’s better to play it safe here to protect your circuit, so figure out the max wattage of your circuit, compare that to the lights, and move on from there. Generally speaking, LED string lights require less energy than incandescent bulbs, translating to a higher number of lights per circuit. 

Inspect for burnt-out bulbs, secure connections, and protect from water exposure to maintain functionality.

Yes, you should purchase and use an extension cord rated for outdoor use to power Christmas lights. Extension cords intended for indoor use do not have the same protective properties as outdoor versions, so they can’t withstand the exposure to the outdoor elements. Be sure to plug your Christmas lights into outdoor extension cords only.

Several Christmas light software options, like Vixen, LOR, xLights, Animated Lights, and Light-O-Rama, allow you to sync music to your Christmas light show right at home. All you need is a computer, the software, and a controller that connects to your laptop. Depending on your technical skills, you should choose more beginner-friendly software like Animated Lights or Vixen.