Room-related lighting

Room-related lighting is uniform lighting for the whole room, providing equally good visual conditions at all points. According to DIN EN 12464-1 "Lighting for indoor work places", room-related lighting needs to be realised instead of task area lighting if the position of workplaces in the room is not known at the time of planning.

Room-related lighting is also the only lighting concept suitable for a flexible, frequently changing arrangement of workplaces.

Recessed ceiling luminaires

Luminaires for mounting in cavities or ceiling voids. Most of the luminaire is recessed in the ceiling and thus not visible. In many cases, the luminaire face is flush with the ceiling.


Polished and highly polished reflectors in luminaires and reflector lamps are used as light controllers. Depending on their design, they produce different intensity distribution curves and beam spreads.


Reflectance indicates the percentage of luminous flux reflected by a surface. The reflectance of light surfaces is high; that of dark surfaces is low. White walls reflect up to 85 percent of the light that strikes them, while light-coloured wood panelling reflects as much as 35 percent. The reflectance of red brick, however, is only 15 percent. So the darker the decor and furnishings, the more light is needed to produce the same illuminance at the working plane.

Rotational casting

Process of forming hollow articles from liquid materials by rotating a mould containing a charge of the material about one or more axes at relatively low speed, until the charge is distributed on the inner mould walls by gravitational force, and then solidified by suitable means.