Round recessed luminaire in aluminium, consisting of (SONO) light housing and recessed housing; housing with trim suitable for installation in plasterboard ceilings; suitable for ceiling thickness of 10-25 mm; optionally: installation in concrete ceilings with a special installation housing; surface white powder coated; luminaire installs in housing without tools optionally flush or protruding by 25mm; completely homogeneously illuminated, satinised PMMA cover; same luminance for all flat luminaires; energy-efficient LEDs with very good colour rendering; binning initial ≤ 3 MacAdam; available in the light colours 3000K and 4000K; CRI ≥ 80; min. 90 % of the luminous flux after 50000 hours; luminaire with 2 cable openings and plug-in terminals for through wiring; degree of protection IP 54; PC I; photobiological safety according to IEC 62471 risk group 0; optional DALI dimmable with CLO function