A down-draft fixed bed gasifier is disclosed that produced clean producer or synthesis gas. The method includes shipping at least a first mobile device to a first end user and at least a second mobile device to a second end user different from the first end use. The emergency light may be mounted to a window pane using suction cups, to a steel door or other ferrous-metallic surface using magnetic strips, hung on a door using an integral hanger or stood on a flat bottom surface.