Sheet steel housing with an evenly wide, all-round edge and 7 mm high upstands for concealed, symmetrical track constructions and cut-out ceilings, direct wide-beam light distribution using a metal grid, sheet steel, with stable, smooth cross slats, painted white similar to RAL 9016, with V-reflector, foldable on one side, ball-proof. Grid fastening via spring-loaded, ball-proof locks that can only be opened with tools, wiring in two-group circuit, grouping of the LED units 1x inside / 2x outside, electrical connection via 5-pin connection terminal with plug-in contact technology.