| 摘要 |
PURPOSE:To provide a precise illuminance pattern distribution within a tunnel in response to external condition in a comparatively simple constitution by providing a system control unit to control the degree of dimmer of each reference lighting appliance within the tunnel, for the outside of the tunnel. CONSTITUTION:A system control unit 1 is disposed at the outside of a tunnel, so that plural lighting appliances 2 which are lined up while electronic addresses within the tunnel are given to each of them, are thereby controlled. Plural illuminance patterns which have been set in advance in response to assumed external conditions, are stored in a memory section 11 as a data table, the illuminance pattern is searched for by a control circuit 13 based on the result of detection by an external condition detecting section 12, so that it is thereby outputted through a power line 3 via an superimposing section 14. Address data and dimming comparison command data are received by a data receiving section 21, and necessary control data stored in advance is read out of a dimming control memory section 24 by a control circuit section 25, so that dimming control signals are thereby sent to a stabilizer 26. |
