The ceiling mount multi-sensor is DALI-2 device which combines motion sensor and light sensor. The device performs motion detection and measures illuminance level. The DALI-2 multi-sensor can work with D4i LED drivers or luminaires, the luminaires just need to be connected to mains power. The result is increased occupant comfort and significant energy savings that meet the most demanding building energy codes. The sensor is suitable for low bay applications which need sensor based automation. The multi-sensor can be powered by DALI bus and no extra power supply required, which means easier and faster wiring and installation process.