In a context marked by the rampant use of glazing as openings in buildings in Senegal, The objective of this study is to establish the optimal occupancy zone under natural lighting in order to determine, based on orientation and glazed surface area, the ideal location that allows occupants to enjoy excellent visual conditions. An experimental approach is therefore adopted. Using a 3000 lx caliber light meter, five measurement points (0.1D, 0.3D, 0.5D, 0.7D, 0.9D) are selected on the line (D) perpendicular to the vertical central axis of the window at a height of 0.70 cm from the floor, using the Lumen method. Reflective glazing is used in our experimental work. Measurements were taken between 8 a.m. and 6 p.m., at one-hour interval for East, West, South, and North orientations, and for different window surfaces of dimensions: 1.5, 1.25, and 1 m2. Minimum illuminance values between 300 and 500 lx are recommended. The results demonstrate that for optimal brightness in the work area, the 0.3D location remains the optimal zone for a south-facing glass surface. The east and west orientations confirm the south results for the 1.5 and 1.25 m2 windows. On the other hand, the 0.1D position is the ideal space for a 1 m2 opening. However, the north orientation is not suitable for satisfactory lighting. In conclusion, this study proves that energy consumption in homes can be drastically reduced by focusing on the optimal occupancy zone.