Patent ID: 9578707
Date: 2017-02-21
CPC Classifications: H05B,Y02B,Y04S

Claim:
1. A lighting system comprising: a light fixture connected to a distribution panel via a power line, wherein the light fixture emits light using power supplied from the power line; a demand controller which obtains a total power usage by a plurality of devices including the light fixture, which are connected to the distribution panel via power lines, and outputs a demand signal according to the total power usage; a control apparatus which includes a switch controller which suspends supply of the power for a first predetermined time period by turning off the switch for the first predetermined time period when the switch controller receives the demand signal; and an occupancy sensor, wherein: the light fixture includes when the detector detects that the power being supplied to the light fixture emitting light in a first illumination state is suspended for the first predetermined time period, the controller: (i) causes the light emitter to emit light in a second illumination state dimmer than the first illumination state when the occupancy sensor has sensed a person in a second predetermined time period immediately before the detector detects that the power being supplied to the light fixture emitting light in the first illumination state is suspended for the first predetermined time period; and (ii) causes the light emitter to emit light in a third illumination state dimmer than the second illumination state when the occupancy sensor has sensed no one in the second predetermined time period.