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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

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. 

Simple repairs like replacing bulbs can be DIY projects, but professionals should handle significant electrical repairs to ensure safety and compliance with electrical standards.

It’s fair to be concerned about handling pool lights or wiring in a pool filled with water. But fortunately, pool lights and swimming pools are designed to make it easy and safe to replace the lights without needing to drain the water. Instead, you can turn off the electricity to the pool as a safety precaution, unscrew the pool fixture, pull it up and out to the side of the pool, then change the bulb.