The module is designed so that not only for the light source,but motion sensor, emergency module or speaker can be inserted into the opening also. Themselves modules can be rotated around the axis and, in the case of a light source, it is also possible to rotate the light source itself. 
You can configure own lenghts of luminaire also. Same design is for wall mounted, suspended and surface-mounted variants. It is simple , minimalistic design for private and commercial interiors. Housing of luminaire is made from aluminium (casting) with powder coating colour.