A modular multi-component power distribution system is provided having a plurality of modular components which includes a bus-bar-like power distribution assembly, branching connectors, flex connectors, and receptacles. The valve head is connected to an elongate valve stem that is mounted in the cylinder head for controlling the intermittent flow of fluid from the intake port to the combustion chamber. An image is captured in an invisible domain of the optical spectrum by illuminating a scene of interest under an illumination corresponding to said invisible domain of the optical spectrum by an invisible light illumination unit.