Study on color temperature change lighting during the day for efficient office work

Verification of the difference in the effect by time

Abstract

In the previous experiment we found that the optimal correlated color temperature of the office lighting assessed using subjective methods approximated to the change of natural light, and the physiological effect was also shown.
In this experiment we paid attention to the ascending curve in the morning of this color temperature change curve, and evaluated whether the effect would change by the case where the ambient lighting was controlled by the ascending curve in the morning as it is, and the afternoon.
We found the ascending curve in the morning brought the result that suggested that mental strain was mitigated, however, the effect was lost by the ascending curve in the afternoon. From this result, we think that this curve is related to time.