Luminaire for escape route lighting. Housing and end caps are made of powder-coated sheet steel. End caps feature no visible screws and include a durable silicone foam seal. The curved diffuser is made of non-yellowing opal plastic (PMMA). It has a specially matched 2-component optical system for homogeneous and soft illumination of the entire light-emitting surface. Suitable for ceiling surface mounting and wall surface mounting. Luminaires have a limited surface temperature in accordance with DIN EN 60598-2-24 for use in environments where non-conductive dust may be expected to deposit on the luminaire.