Single luminaire of the ceiling-mounted light channel system for architectural lighting. The luminaire is part of a range of recessed, surface-mounted and suspended luminaires that are coordinated in appearance. System-relevant accessories such as installation and ceiling fastening clips, as well as head pieces are included in the scope of delivery. For ceiling mounting indoors. The opal, finely structured, homogeneously illuminated PMMA diffuser is flush-mounted. With Lambertian luminous intensity distribution. Luminaire luminous flux and light color are fixed. Rated luminous flux 2666 lm, rated power 27 W, maximum luminaire luminous efficacy 99 lm/W. Light color neutral white, correlated color temperature (CCT) 4000 K, general color rendering index (CRI) Ra > 80. Color location tolerance (initial MacAdam) = 3 SDCM. Average rated service life L90(tq 25 °C) = 50,000 h. The light source is replaceable in accordance with ecodesign requirements (Regulation (EU) 2019/2020). Channel elements made of extruded aluminum profile, head pieces made of plastic (PMMA). Surface coated white (RAL 9016). Dimensions (L x W): 1126 mm x 50 mm, luminaire height 62 mm. Protection class (EN 61140): I, protection type (DIN EN 60529): IP20, shock resistance level according to IEC 62262: IK03, test temperature glow wire test according to IEC 60695-2-11: 650 °C. Weight: 2.9 kg. The mains connection is made using a 5-pin connection terminal up to 1.5 mm2. With electronic control gear, switchable. The control gear is replaceable in accordance with ecodesign requirements (Regulation (EU) 2019/2020). The product meets the basic requirements of the applicable EU directives and the product safety law and bears the CE marking. Luminaire 10 years, spare parts (LED module, control gear, optical system) 15 years after the invoice date, subject to reasonable changes in the interests of progress.