Flat, square surface-mounted luminaire. Die-cast aluminum fitting, powder-coated, plastic (polycarbonate) cover. With narrow-beam plastic lenses for escape route lighting. Operating device suitable for direct current, suitable for central emergency power supply. Luminaires with limited surface temperature in accordance with DIN EN 60598-2-24 for use in an environment in which deposits of conductive dust on the luminaire can be expected. Ball-proof in accordance with DIN 18032-3. Approved for use in the food and beverage industry.