Linear recessed ceiling and wall luminaire for aesthetically sophisticated lighting. The luminaire features four LED light units. The housing is made of extruded aluminium profile and is powder-coated. The end cap is also aluminium and powder-coated. Each LED light unit utilizes MRS technology, which includes a Mini-Reflector-System made of metallised thermoplastic with a prismatic black glare-suppressing frame for pleasant, glare-free light (UGR < 10). Each LED light unit contains seven reflector elements and provides wide beam light distribution. It is designed for ceiling installation with a pre-assembled SBS mounting system. The LED unit has an integrated converter that is interchangeable and removable, and it is suitable for through-wiring.