Attractive and highly efficient diffuser light for use even under increased requirements. Housing and end caps made of powder-coated sheet steel. End caps without visible screws, with permanently dimensionally stable silicone foam seal. Curved diffuser made of non-yellowing plastic (PMMA), opal. Specially coordinated 2-component optical system for homogeneous and soft illumination of the entire light-emitting surface. Suitable for ceiling mounting, wall mounting. Control gear integrated. Suitable for through-wiring. Luminaires with limited surface temperature according to DIN EN 60598-2-24 for use in an environment in which a deposit of non-conductive dust on the luminaire can be expected. Approved for use in the food and beverage industry. Environmentally friendly and resource-saving thanks to replaceable components.