Linear recessed ceiling and wall luminaire for aesthetically sophisticated lighting. Housing made of extruded aluminium profile, powder-coated. End cap is also aluminium and powder-coated. The diffuser is made of non-yellowing plastic (PMMA) with a microprismatic design. It features a specially matched 2-component optical system for glare-free light at the workstation, suitable for environments with computer screens in accordance with EN 12464-1. The ceiling installation includes a pre-assembled SBS mounting system and is suitable for recessed ceiling mounting. The LED unit has an integrated converter that is interchangeable and removable, and it is suitable for through-wiring.