A power source includes a housing formed of a front face and a plurality of side walls extending from the front face; the front face and the plurality of side walls define a compartment. A first ballast is secured to a first side wall of the plurality of side walls, and a second ballast is secured to a second side wall of the plurality of side walls that is disposed opposite the first side wall. A first set of passive cooling fins extends from the first side wall, and a second set of passive cooling fins extends from the second side wall.