Sheet steel housing with an evenly wide, all-round edge and 7 mm high upstands for ceilings with visible T-rails, concealed symmetrical rail constructions and cut-out ceilings, direct light distribution using reflection-enhanced MIRO® aluminum parabolic louvre, satin matt anodized, for computer workstations, 65° < 1000 cd/m² all-round glare protection in accordance with the current standard DIN-EN 12464-1, self-locking, can be folded down on both sides, electrical connection via 3-pin connection terminal with plug-in contact technology.