No matter if you are looking for directional or diffuse measurements ? with the Light Sensor Dual both work! The challenge must not be underestimated. In order to obtain usable information about the lighting situation in a room, it is not sufficient to simply determine the general brightness. It is important to combine the measurement, e.g. at table height, with the determination of the diffuse room brightness. In this way, error influences can be eliminated for better light control. And the STEINEL Light Sensor Dual is perfect for this.