Sheet steel housing suitable for ceilings with visible T-rails, concealed symmetrical rail constructions and cut-out ceilings, direct light distribution using a micro-prism panel made of PMMA, a soft light is transmitted to the outside with frosted diffusers, light color neutral white (840) with very good color consistency and high color rendering Ra>80, for computer workstations, 65° < 3000 cd/m² all-round glare protection according to the current standard DIN-EN 12464-1, electrical connection via 3-pin connection terminal with plug-in contact technology.