Abstract: A light source unit includes a light-emitting element 52 such as a LED provided on an inner surface of a side wall 4, and a reflecting surface 31 opposed to the light-emitting element 52 with the side wall 4 made parallel to a direction of radiation of the reflecting surface 31, the reflecting surface 31 formed of a part of a curved surface formed by a paraboloid of revolution or the like that is obtained by revolving a parabola and is spread and opened in the direction of radiation.

Abstract: In one embodiment, a lighting equipment includes a thermally conductive housing. A light source portion formed of a light emitting element as a light source is accommodated in the housing. A spacer element is arranged between an inner wall of the housing and the light source portion to form an accommodation space between the spacer element and the inner wall of the housing. A heat transmitting device thermally connects the light source portion with the inner wall of the housing passing the element accommodation space. The heat generated in the light emitting element is dissipated through the heat transmitting device.

Abstract: In one embodiment, a light source unit includes a reflector formed of synthetic resin. The reflector includes a radiation opening, a reflective surface formed of a portion of a curved surface expanding toward the radiation opening, a reinforcing element formed to connect ends of the radiation opening, and a light source arranged in a side of the reflector so as to face the reflective surface.