| 摘要 |
PROBLEM TO BE SOLVED: To enable to provide various settings for each lighting fixture without the need of a device for exclusive use, and irrespective of a distance between the lighting fixture and a user, in a lighting fixture with an illuminance sensor mounted.SOLUTION: An output control section 7 of a lighting device 3, controls a lighting circuit section 6 in accordance with a light-control command value from an operation control section 8 to control an output (a light-control ratio) of a light source 4. The operation control section 8 outputs the light-control command value to the output control section 7 so as a signal level (a sensor voltage) of an output signal of an illuminance sensor 5 to be a predetermined value and to carry out feedback control of the supply power to the light source 4. And also, the operation control section 8 determines increase and decrease of the sensor voltage of the illuminance sensor 5. In case of a predetermined increase and decrease pattern occurring, the operation control section 8 switches the operation mode to output a light-control command value to the output control section 7 in accordance with the operation mode. |
