Light bar for releasably mounting multiple light modules

A vehicle-mountable track-lighting light bar supports multiple light modules in user-configurable mounting positions, each of the multiple light modules having a mounting foot, electrical contacts, and laterally extending track-attachment members. Multiple laterally spaced-apart electrically conductive pathways are supported on a floor of each of light module mounting tracks. A light module, when its mounting foot is set in a light module mounting track, is slidable lengthwise along the track length while its electrical contacts contact associated ones of the electrically conductive pathways. A controller is electrically associated with the electrically conductive pathways so as to apply electrical signals for delivery to the electrical contacts of the light module.