| 摘要 |
<p>An illuminated location is divided up into a plurality of illumination zones for each of which a design illuminance is decided upon taking into account such factors as the use of the zone. Each illumination zone is provided with a plurality of fluorescent lamps, one or more inverters to which the lamps are connected, a photometer for receiving light reflected from objects in the zone, a controller for changing the current values of the inverters, and a setting device. The design illuminance decided is input to the controller for each illumination zone by the setting device. At prescribed time intervals, the controller reads in a change in the output of the photometer and, in dependence upon the change, alters the output current values of all inverters of this illumination zone, whereby the brightness of the illumination zone is corrected so as to be held at the originally set design illuminance. <IMAGE></p> |
