The aim of this collocation is to bring the two communities in contact: the LS community, which has been active in lighting systems, expanding to smart and human-centric lighting, and the IEEE community, which has been focusing, on among others, energy efficiency for domestic appliances including lighting. This joint event will provide a unique forum to discuss and debate the latest developments in energy and environmental impact of residential appliances and lighting, heating and cooling equipment, electronics, smart appliances, smart meters, consumer behaviour, the policies and programs both adopted and planned. This interaction will give birth, for sure, to new successful collaborations.