抄録
The possibility of the practical use as an office lighting system, which make the total illuminance of 400lx and Task and Ambient illuminance ratio of 1.0 on the working desk, by using Task and Ambient Lighting system was reported on the last year research. On this year research, the following aspects were indicated based on the analysis of the psychological queries after two weeks actual work in the specific illuminance level and Task and Ambient illuminance ratio. The illuminance level of 200lx on a working desk cause some psychological problem as room and desk area ‘darkness’ and illuminance level ‘unevenness’. These problems were improved when the illuminance level of 300lx was applied. And this analysis suggested that the Task and Ambient illuminance ratio shall be around 1.0. An approximately 20% saving energy can be achieved under this lighting system condition compared with the general office lighting system.
