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No, you should not leave LED Christmas lights up all year. While the LED lights themselves are very durable, their wiring and casings can be as vulnerable as any Christmas lights. They’re subject to drying out, experiencing cold or sun damage that causes them to crack, and even damage caused by gnawing pests. (The same is true of incandescents.) If you want your lights to last the years that they’re rated for, bring them inside after Christmas is over. 

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.

If only half of your string of Christmas lights is out, it likely means that you have a broken or loose bulb somewhere along the strand. That’s why we suggest inspecting and testing each bulb to ensure it’s still tight and functioning properly. Luckily, this problem is quickly solved with a DIY fix, such as replacing the bad bulb or repairing a damaged shunt.

Modern outdoor light fixtures are waterproof and weather resistant, and, provided they’re installed correctly and by a professional, the fixture and wiring can last for 20 to 30 years or more. The lifespan will depend largely on the quality of the fixture. The lifespan of the bulb will depend on the type of light you install:

• CFL bulb (for sustained use): 15,000 hours

• Halogen bulb (mostly for security): 2,000 hours

• HID bulbs (for security): 12,000 hours

• Incandescent bulb: 1,000 hours

• LED bulb: 50,000 hours