| 摘要 |
<p>PURPOSE: To provide a lighting system not giving a feeling of glare or darkness, by controlling a condition of lighting a lamp in accordance with brightness in the periphery. CONSTITUTION: A main control part 4, when an operating switch 1 is turned on to start power supply, decides whether or not detected illuminance by an illuminance sensor 3 in this point of time is a decision value or more, to give control signal S1 for all lighting a lamp La to a power switching part 5, when the detected illumination intensity is the decision value or more, and to give a control signal S2 for controlling dimming to a dimmer control part 6 when the detected illuminance is less than the decision value. In the dimmer control part 6, when the control signal S2 is received from the main control part 4, a generating phase of a phase control signal given to the power switching part 5, that is, a trigger signal is momentarily changed in order to increase illuminance of the lamp La by a prescribed factor.</p> |
