Abstract: According to one embodiment, a plurality of first saturable units respectively include input sections connected to an output side of a constant current power supply apparatus in series to one another and respectively supply outputs to loads corresponding thereto. A second saturable unit includes an input section and an output section, the input section being connected to the input sections of the first saturable units in series. An abnormality detecting unit monitors a state of the load of at least one of the first saturable units, closes the output section of the second saturable unit during normal time, and opens the output section of the second saturable unit during abnormal time.

Abstract: A light-emitting device and a luminaire that can reduce glare are provided. A light-emitting device according to an embodiment includes a substrate, an LED chip mounted on the lower surface of the substrate, a light reflecting member arranged downward and on one side when viewed from the LED chip and opened on the other side, a surface of the light reflecting member opposed to the LED chip being a light reflecting surface, and an optical member configured to guide light emitted from the LED chip and reflected by the light reflecting member downward.

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.