Sheet steel housing suitable for ceilings with visible T-rails, concealed symmetrical rail constructions and cut-out ceilings, protection class refers to visible luminaire surface, suitable for use in clean rooms and clean room areas according to DIN 14644-1, manufactured according to IPA specifications, as well as the GMP (Good Manufacturing Practice) quality assurance guidelines, direct light distribution using a diffusely radiating, satin-finished diffuser made of acrylic glass with a naturally anodized aluminum frame, light color neutral white (840) with very good color consistency and high color rendering Ra>80, electrical connection via 3-pin connection terminal with plug-in contact technology.