ELC control unit (ELC=ESYLUX Light Control) with integrated constant light control for high energy efficiency. SymbiLogic technology for energy-efficient human centric lighting in the workplace. Plug-and-play connection of up to 4 ELC lights with tunable white. Two button inputs for conventional buttons (230 V). Optional 8-way keypad (accessory) for manual override. Manual override and calling up of scenes in two separate light channels. Fast plug-and-play connection of the lights via RJ45 plug connections. Can be easily networked with other ELC control units via plug connection. Basic system designed for a light connection (RJ45) of 3 m. Expansion with DALI lights possible via integrated DALI bus outputs. Presence-dependent switching of HVAC via separately available DALI switching actuator (DALI switch).