Abstract
This study examined the influence of the occupants' eyes position and the installed lighting equipment position on the suitable illuminance. In the experiment, seven subjects adjusted the suitable illuminance for relaxation. By using the experimental result, authors examined two problems:1) to investigate the point where occupants looked when they adjusted illuminance; 2) to propose the method for estimating the illuminance. The main results were followings:
1) When the occupants adjusted illuminance, they looked positions where was mainly the lighting equipment, the surrounding it and the extreme bright/dark point made by light reflection, regardless of the eyes position.
2) The suitable lluminance of the bracket at wall was not so difference in any eyes position and installed lighting equipment position in this experimental condition.
3) The suitable illuminance could be estimated by the profile angle, even if the eyes position and the installed lighting equipment position changed, The profile angle was defined as an angle where the direction from the eyes position to the lighting equipment position intersected with the direction of the front of the occupants.
