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If you need to visually inspect your Christmas lights to determine which are good and which need replacement, there are a few things to look for. First, look for discoloration, such as a dark spot or two on the inside of the glass. The spot is an indication of a burnt filament. Also, look for missing filaments, cracked bulb glass, and broken sockets.

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

Local building codes typically require conduit around exterior wiring. Conduit protects the wire from moisture, extreme temperatures, sun exposure, and harsh weather conditions to prolong its lifespan. When a wire is worn out, it can be dangerous as the risk of electric shock or fire increases.

Cold weather can cause older incandescent Christmas lights to fail by causing cracks in the finish or the glass itself. Modern LED lights are affected in the opposite way and perform even better as the temperature drops.