Round highbay luminaire with precise optical system for glare-free lighting. Housing: die-cast aluminium with eye ring, powder-coated. Optimised thermal management thanks to special luminaire design. Self-cleaning heat sink for constant heat dissipation. Specially matched lens optics system made of non-yellowing plastic (polycarbonate). Maximum efficiency and glare-free lighting up to RUG ≤ 19. Easy to install thanks to 1-point suspension. Suitable for chain or steel cable suspension (to be provided on site). Ceiling- and wall-mounting bracket available as accessory. Connection cable, double insulated, with open ends. MultiLumen: Several steps adjustable luminous flux. Factory setting is the highest luminous flux. Stand-alone movement sensor for presence-dependent lighting control with built-in daylight sensor optionally available. Luminaire with limited surface temperature in accordance with EN 60598-2-24 for use in environments in which a deposit of conductive dust on the luminaire can be expected.