Ultra-flat LED ceiling luminaire with 10 mm thickness only, approx. 95 % direct beam, wide beam, additional ceiling lighting and very even, almost floor-to-ceiling illumination of walls by secondary light, flexible application by means of magnetic attachment, version for 24 volts DC, external converter required, this converter can be integrated in a suspended ceiling or an appropriate in-ceiling junction box, the mounting ring of the luminaire can be directly fastened to this in-ceiling junction box.