A trunking lighting system is a continuous-row lighting assembly designed with a modular concept. Many commercial and industrial lighting applications, such as offices, supermarkets, retail stores, libraries, warehouses, airports, schools, laboratories, etc. demand a robust lighting system that provides effective, adaptive and efficient lighting in a visually and architecturally cohesive form. The flexible trunking system adapts individually to complex lighting tasks while providing a future-proof platform that echoes the advancements in lighting technology. The scalable and modular feature of trunking systems gives lighting designers a great amount of options and customizations that can be implemented without much hassle. A trunking lighting system consists of trunking rails, rail mounted luminaires and accessories. A trunking rail is a rigid aluminum extrusion or roll-formed sheet steel channel that allows the passage of power cables and provides a support structure for the luminaires.