Truck license plate light Function and purpose: Illuminates the license plate on trucks and trailers to ensure visibility at night. Compatibility: Suitable for most trucks and trailers; can also serve as a marker light for car applications. Key benefits: brightness for clear plate legibility; easy to install; durable for long term use. Performance notes: Provides reliable illumination in varying weather and road conditions. Tractor light Function and purpose: Easy to install light that supports trailer marker lighting needs for tractors. Compatibility: Designed for tractors and associated trailers requiring marker lighting. Key benefits: Simple installation, durable construction, dependable marker illumination. Performance notes: Built to endure regular use and outdoor exposure. Truck marker lights Function and purpose: Used as side marker lights or license plate lights on trucks. Compatibility: Compatible with standard truck marker lighting configurations and plate lighting needs. Key benefits: Enhances vehicle visibility from the sides and rear; improves compliance with marking requirements. Performance notes: Reliable brightness with steady operation in typical trucking environments. Door plate light Function and purpose: Provides brightness to improve visibility of door and surrounding area at night. Compatibility: Suitable for trailer and truck door plate lighting needs; also serves as a trailer license plate light. Key benefits: brightness for clear night illumination; easy to see for safer entry and operation. Performance notes: Designed for dependable nighttime visibility and door area lighting. Use scenarios On a heavyduty truck, install the truck license plate light above or near the license plate to ensure it is clearly illuminated for nighttime legality. On a utility trailer, use the truck marker lights as side markers and the license plate lighting to meet visibility and compliance requirements during night hauls. On a farm trailer or tractor setup, deploy the door plate light to brightly illuminate the door area and the trailer plate for safer access and improved roadside visibility. Notes The set covers four lighting functions: license plate illumination for trucks, tractor trailer marker lighting, general truck side and plate marking, and door area illumination. All components are described as easy to install and durable for regular outdoor use, with brightness where specified.