Abstract: A lighting device for street light, lounge light, signboard light or streamline worktable light application to meet energy-saving and carbon-reduction requirements is disclosed to include a light source, a lamp case, a power converter, a shaped reflector for reflecting light rays from the light source toward a predetermined space area to form a rectangular or specially shaped illumination zone, and a light-transmissive material. The shaped reflector includes an inner reflecting surface, two lateral walls respectively formed of a straight line segment structure of an outwardly arched curvature, and opposing front and rear walls respectively providing an outwardly arched curvature. Each outwardly arched curvature consists of multiple inclined faces inclining in such a manner that an upper inclined face inclines toward the center of the shaped reflector at a relative greater angle than one adjacent lower inclined face.