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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. 

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.

While most general electricians can repair lamps and light fixtures, it is often better to hire a lamp repair specialist. Many electricians prefer larger jobs, such as fixing electrical systems or relocating fixtures, and may not offer lamp repair services due to the small scale of the work. Additionally, some lamps, particularly antique models, require dedicated expertise that a general electrician might not have. A lamp repair specialist will be familiar with various types of fixtures and can provide a more dedicated service. If you have already hired an electrician for a larger project, you can ask them to look at your lamp, but for a standalone repair, a specialist is typically the best option.