DALI control unit Bluetooth for cavity/luminaire installation. Bluetooth control unit for daylight and presence-dependent control of up to 32 DALI participants DT6 and DT8, HCL control with integrated real-time clock (RTC), connection of up to 4 sensors and push-button couplers, various changeable function modes, configuration and operation via iOS or Android app Osram BT Control, housing intended for installation in cavities such as suspended ceilings or possibly also in luminaire housings.