Sheet steel housing, rectangular cross-section, clean rooms and clean room areas according to DIN 14644-1, also IPA certified luminaire, tested for clean room systems according to ISO CLASS 1 as well as chemical and biological resistance at individual component level, direct light distribution via diffusely radiating, satin-finished diffuser made of acrylic glass with 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.