LED ceiling-recessed luminaire (pre-assembled luminaire), designed for use where space is limited in ceiling: recess depth <100mm; "stableWhite" LED luminaire, with symmetric wide-beam light distribution with maximum luminaire efficiency and optimum photometric properties; lamp(s): LED1800-940; Colour rendering Ra > 90, colour temperature 4000 K (neutral white); Chromaticity tolerance (initial MacAdam): 2; total power: 15 W; Luminaire luminous flux: 1786 lm, Luminaire efficacy: 119 lm/W; service life: 50000h at 95% luminous flux; includes separate control unit Slave luminaire for DALI control (DALI only); high-quality reflector unit fixed to modular LED lighting chamber by twist-and-lock mechanism; high-efficiency LED lighting chamber is integrated in optimised, passive thermal management system of diecast aluminium; reflector: smooth, matt aluminized finish; reflector/trim made of high-quality, UV-resistant polycarbonate; cover ring white; mounting ring of Glass fibre-reinforced polycarbonate (PC), grey; luminaire unit can be fitted quickly without tools using twist-and-lock mechanism; IP44_IP20; luminaire wired with halogen-free leads; power connection: 5-pole connector terminal, loop-in/loop-out possible; mains voltage: 220-240V / 0/50/60Hz, for use with 220V DC central battery; tool-free quick installation using antislip spring clips in ceilings of thickness 1-40mm; ceiling cutout: 150mm, recess depth: 81mm; weight: 0.79 kg; Note: To achieve EN12464 compliance in office applications (UGR<19, aluminized reflector type), please order an additional antiglare ring