A light bar for a motor vehicle has a plurality of lights mounted to an elongated support member is rotatably connected to opposing end walls of a rectangular frame. An offset cam is connected to the support member and moved by an actuating mechanism between a first and second position which cause the support member and lights to rotate about an axis to corresponding first and second positions. When the support frame and lights are in a first position they are shielded by and substantially enclosed by the sides and ends of the rectangular frame, and when in a second position the lights extend above and generally parallel to the rectangular frame to shine above and forward of the rectangular frame. A power switch energizes the actuating mechanism to move the lights and support member between the first and second positions.