Sheet steel housing suitable for ceilings with visible T-rails, concealed symmetrical rail constructions and cut-out ceilings, protection class refers to the visible luminaire surface, 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.