Dosage forms having a core having a surface having means for controlling release on an active agent; methods of manufacturing, tools used in manufacturing; and uses of the dosage forms are described. A first light flux producer for producing a first light flux and a second light flux producer for producing a second light flux are arranged on the light emission side of a lamp. The stack of porous structures is disposed between a bottom plate and a top plate in the furnace, wherein the bottom plate, the stack of porous structures, and the ring-like spacers define an enclosed cavity. A switch responsive to an output signal from the sensor is adapted to selectively decouple the light source from a power supply when the sensor detects that the cover is attached to the light source. The assembly may comprise an outer slide in sliding or rolling engagement with an inner slide, and a brake comprising at least one pivot member may be coupled to the inner slide. The present invention also relates to the use of these compositions for controlling undesirable vegetation, in particular in crops.