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High-quality landscape lights that are hardwired and properly maintained can last for 10 to 25 years or more. You’ll usually get a longer lifespan from soffit lights and wall-mounted lights that aren’t directly exposed to the elements or prone to damage from foot traffic or vehicle traffic. Solar-powered and battery-powered lights often won’t last as long, but you can still expect a lifespan of five to 15 years.

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. 

Flickering lights, intermittent outages, or physical damage to fixtures signal immediate repair to avoid electrical hazards.

The average cost to install outdoor or landscape lighting is around $4,000, with most projects ranging from $2,000 to $6,000. The total cost can vary widely depending on several factors, including the number of fixtures, design complexity, and the type and quality of the lights used, such as wall sconces, pathway lights, or lamp posts. Other factors that influence the price are the square footage of the area being lit, the amount of electrical work needed, any required excavation or trenching, and local permitting costs. For specific types, you might pay around $100 for pathway or string lighting and up to $700 for lamp post lighting.