What type of electrical wiring is typically used for outdoor lighting?

UF (Underground Feeder) cable is specifically designed for outdoor applications, making it the most suitable choice for outdoor lighting. This type of cable is rated for direct burial and can withstand moisture and other environmental factors that are common in outdoor settings. It features a tough outer sheath that protects the wires inside from damage and degradation due to exposure to water, soil, and various weather conditions.

While NM (Non-Metallic) cable and Romex cable are types of wiring primarily intended for indoor use, they are not suitable for direct burial or outdoor environments. THHN wire is generally used for indoor applications and requires protection, such as conduit, when used outdoors. UF cable's construction and ratings make it the most appropriate choice for safely powering outdoor lighting.