IEC 62386-304:2017 specifies a bus system for control by digital signals of electronic lighting equipment which is in line with the requirements of IEC 61347, with the addition of DC supplies.
This document is only applicable to IEC 62386-103:2014 and IEC 62386-­103:2014/AMD1:— input devices that deliver illuminance level information to the lighting control system through light level sensing.