A two part bracket for mounting a light bar to an environmental surface. The bracket may comprise two mirror image platforms or members hinged to one another to move from an open condition to a closed or folded condition. Each platform may have a plurality of holes for passing fasteners to fix the platform to the light bar or to the environmental surface. In the closed conditioner, the bracket obstructs casual access to these fasteners. Each platform has an eye which aligns with the eye of the other platform when the bracket is in the closed condition, to receive the shackle of a padlock for example. Each platform includes pads which abut pads of the other to oppose collapse of the bracket due to weight loads.