Multifunctional DALI/DSI control unit for separate control of four lighting groups. Four control outputs, each with individual, automatic switching for DSI and DALI-compatible lamp operating devices. Maximum of 25 DALI or 50 DSI operating devices per output channel. Dimming range: 100 to 1%. The lighting control unit has a built-in 10 amp relay, which optionally also de-energizes the lamp operating devices when the lamp operating devices are switched off. The connections are made via screw terminals. Housing in control cabinet design made of flame-retardant polycarbonate, halogen-free, gray (RAL 7040), with status LED and test button, dimensions: 140 x 90 x 59 mm, weight: 0.36 kg.