Ring shaped luminaire housing from rolled aluminium extruded profile, seamlessly welded; flat design luminaire housing; surface powder coated; pendant fitting with cable suspension, alternatively with canopy central; height adjustment without tools; incl. feed (black or white); converter included in canopy; HPO (High Performance Opal) cover for uniform illumination; optional with direct/indirect illumination characteristic for additional emphasis of the ceiling and more visual comfort; energy-efficient LEDs with very good colour rendering