Semi-recessed and surface-mounted luminaires in diverse sizes with high light output. Semi-recessed luminaires for installation in suspended ceilings with shallow depths. Both groups are characterized by their convenient mounting system for easy and economical installation. A new series of downlights with dual lighting technology. The unit comprising reflector and shield divides the light of the light source, the greater part of the light as downlight and the smaller part as free-radiating light. The combination of this diverse light distribution produces very efficient, high illuminance directly below the luminaires, as well as effective free-radiating light. Satin matt crystal glass with light-diffusing texture provides pleasant uniform light.