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While wet-rated and damp-rated lighting is designed to handle contact with moisture, there’s a difference between the two. Wet-rated lighting is safety-rated to be placed in areas with direct exposure to water, including your shower. Fixtures classed as wet-rated are made with waterproof seals to protect the filament and other electrical components from water and moisture. 

Damp-rated fixtures can be used in places with some moisture contact, but not direct exposure. They don’t have the same waterproof seals used in wet-rated fixtures. Damp-rated lighting can be used on your bathroom ceiling or along a wall outside of your shower.

Yes, outdoor lights and receptacles should be on a ground-fault circuit interrupter (GFCI) for safety. The outdoors is considered a wet location where GFCI protection is generally required. A GFCI enhances safety by automatically tripping and shutting off the circuit if it detects an imbalance, which protects against electrocution and reduces the risk of an electrical fire. While it is the safest approach for all outdoor electrical components, specific requirements can vary depending on the type of light (e.g., pool lights), its location, and local electrical codes. For guidance tailored to your specific situation, it's best to consult a professional electrician.

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. 

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.