| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an illumination control system wherein the main unit can carry out different illumination controls depending on illumination load groups whereby the construction time and the cost are reduced. SOLUTION: An light control terminal 3b of the main unit is connected to a plurality of lighting fixtures 4 through two-wire light control signal line 6. The light control signals having different periods T1 to T3 from the light control terminals 3b are transmitted to the lighting fixture groups G1 to G3 through the light control signal line 6. The lighting fixtures 41... belonging to the lighting fixture groups G1... selectivety receive light control signals having previously designated periods T1... among the light control signals received, and charge a lighting level of a fluorescent lamp 14 which is the light source, based on the duty ratio of the light control signals received. Accordingly, one light control terminal 3b can carry out light control of different lighting fixture groups G1 to G3, and thus it can provide a light control system which can be operated at low cost and reduce the construction time compared with a prior art system requiring a light control terminal for each lighting fixture group G1....</p> |
