照明の変動知覚における開始照度と調光曲線の影響に関する研究

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タイトル別名
  • THE EFFECT OF STARTING ILLUMINANCE AND DIMMING CURVE ON THE PERCEPTION OF LIGHTING FLUCTUATION
  • ショウメイ ノ ヘンドウ チカク ニ オケル カイシ ショウド ト チョウコウ キョクセン ノ エイキョウ ニ カンスル ケンキュウ

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 Following previous research, this study was conducted on the factors of starting illuminance levels and dimming curves to observe the perceptual characteristics resulting from changes in the brightness of office lightings.<br> Per experimental conditions, two desks were placed inside the testing room (Area: 12.25 m2), and two people participated in the experiment at the same time. For the lighting, four HF fluorescent lamps (32W, 6700K) were fixed to the ceiling, and the dimness of light was controlled using a dimmer. The level of illuminance in the acclimation room before the experiment and in between sessions was set at 500lx on the surface of the desk.<br> The conditions for Experiment 1 involved 12 patterns, with two levels of staring illuminance (500lx and 1, 000lx), two illuminance ratios (0.54 and 0.7), and three rates of changes. The experimental methods used in the prior paper for Experiment 2 were followed precisely for this experiment.<br> Therefore, it was found that the perception of the subject was influenced not only by the illuminance ratios and rates of change, but also by the starting illuminance. It was confirmed that a high starting illuminance of 1, 000lx lowered the perceptibility of the subject, even at the same illuminance ratio and rate of change in the room and on the surface of the desk. As for the tolerance experienced with regard to the changing brightness, it was found that tolerance was increased if the starting illuminance was higher, if the illuminance ratio was higher, and if the rate of change was slower.<br> The conditions for Experiment 2 consisted 12 patterns, with the starting illuminance at 750lx, two illuminance ratios (0.5 and 0.7), and three types of light dimming curves (convex, concave, and Weber) for the two rates of change.<br> Therefore, no definite effect of the dimming curve was confirmed at any of the illuminance ratios. Within the set conditions of the experiment, it was concluded that the dimming curves had little effect on the perception of brightness and that the illuminance ratio and changing time affect the perception of an office worker.<br> As for the tolerance to change in brightness, it was found that tolerance increased for patterns where the illuminance ratio was high and changing time was long. In addition, particularly in patterns with long changing times, the range of tolerance of the Weber curve was slightly larger than that of the other dimming curves. Within the set conditions of the experiment, it was found that linear changes were most suitable for lowering the perceptibility. However, by considering factors such as the difference in the testing environment and lighting apparatus compared to those of experiments in prior research and the fact that the dimming curves were not smoothly operated to the nature of the lighting control system, it is necessary to conduct further experiments in future for observing perceptual characteristics.

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