A ceiling-recessed office lighting fixture. A two-layer microprismatic diffuser reduces glare and evenly directs the light, ensuring visual comfort during long office work in front of a computer screen. The housing is made of white painted steel sheet. The electrical connector on the back of the fixture shortens the assembly time. Tool-free power supply connection and luminaire mounting in modular ceilings. Installation in plasterboard ceilings with a thickness of 12.5 mm to 25 mm is possible with additional adjustable brackets. The luminaire is equipped with a light source and separate lighting control equipment that cannot be replaced by the user.