Apollon® 21 square, office luminaire. * lighting technology 1: - primary optical cover: micro prismatic cover, of PMMA, - CAT 2 (L<= 3000cd/m²), - UGR viewing direction along longitudinal luminaire axis ≤ 19 (X = 4H | Y = 8H | S = 0.25H | reflection values 70/50/20), - UGR viewing direction along lateral luminaire axis ≤ 19 (X = 4H | Y = 8H | S = 0.25H | reflection values 70/50/20), - primary emission direction: below, - primary beam angle: wide distribution, 90°, - light emission: direct distribution, - primary light characteristic: symmetric, - laterally positioned lamps, concealed from below. * mounting: - installation arrangement: single arrangement, - installation type: lay-in mounting, - installation location: in the ceiling. * electrical 1: LED, - rated luminous flux: 4.100lm, - luminous efficacy: 166lm/W, - light colour: 940, - colour temperature: 4000K, - colour rendering: CRI > 90, - control gear: DALI 2, - with terminal, 5-pole, - mains connection: 220..240V, AC/DC, 0/50..60Hz, - rated input power: 24.7W. * component: - housing, of aluminium, coated, traffic white (RAL 9016). - module: M625, - length: 620mm, width: 620mm, height: 30mm, - ceiling cut-out LxB: 605 x 605mm, - weight: 2,1 kg. - housing upper side, of sheet steel, galvanised. * testings/approvals/admissions: - protection rating (complete): IP20, - protection rating (lamp compartment, on room side): IP50, - insulation class (complete): insulation class II (safety insulation), - certification: CE, ENEC, - impact resistance: IK03, - permissible operating ambient temperature: -20..+45°C, - permissible storage temperature: -40..+80°C. * service life: - rated service life: 50.000h (L90/B50) at AT= 25°C - rated service life: 100.000h (L80/B50) at AT= 25°C. - packaging unit: 1 piece, - ultra-slim construction. * manufacture: Siteco, Apollon® 21 square. * type: 51MQ11WD2114.