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: According to one embodiment, a control section controls a lighting circuit on the basis of a luminous intensity ratio table of a set rated current type to have a luminous intensity ratio corresponding to a current value detected by a current detecting circuit. The control section switches, according to a switch signal input from a power supply line, the luminous intensity ratio table to a luminous intensity ratio table of a rated current type corresponding to the switching signal.

Abstract: According to one embodiment, a marker lamp is supplied with electric power from an alternating constant-current power supply device via a saturable device. The marker lamp includes a solid-state light-emitting circuit functioning as a light source and a lighting circuit configured to subject the solid-state light-emitting circuit to lighting control. The marker lamp further includes an abnormality monitoring device configured to monitor a state of the solid-state light-emitting circuit and open, if detecting an abnormal state, an output side of the saturable device corresponding to the marker lamp.

Abstract: According to one embodiment, a lighting control circuit includes a rectifying device configured to rectify an output of an alternating constant-current power supply device capable of changing an output current value, a power converting section configured to receive an output of the rectifying device and variably output direct-current power, and a solid-state light-emitting element supplied with the output of the power converting section to be lit. A shunting device configured to shunt a part of an output current from the alternating constant-current power supply is provided on an input side of the rectifying device.