Recessed luminaires

Recessed ceiling luminaires with different light distributions

Recessed luminaires integrate into the architecture. As a downlight, floodlight, wallwasher or directional luminaire in round or square version they fulfil their task without unduly affecting the ceiling’s appearance.

Criteria for recessed luminaires
- choice of luminaire determines lightcolour and light intensity
- emission angle determines thebeam of light
- cut-off angle or optical cut-off limit glare and increase visual comfort
- recess depth
- size of ceiling aperture
- mounting detail (covered, flush)

Downlights are suitable for attractive, uniform and efficient ambient lighting. They are optimally shielded for good visual comfort. In luminaires with lens system this is achieved by a wide optical cut-off or by an equivalent cut-off angle in darklight reflectors.
Luminaires with quite a narrow beam spread are ideal for high rooms, combining good visual comfort with uniform illumination.

Recessed luminaires

Double-focus downlights have a rotationally symmetric beam. With a narrow light distribution, this downlight is suitable particularly for use in high rooms. For mounting in inclined ceilings, the luminaire should be adjustable for optimum beam alignment directed vertically downwards.

Downlights have a rotationally symmetric beam that is directed vertically downwards.

Washlights have an asymmetric beam that is directed vertically downwards and onto vertical surfaces. They provide an even illumination for wall and floor surfaces. Special forms are double washlights for illuminating two opposite wall sections and corner washlights for illuminating corners of rooms.

Lens wallwashers have an asymmetric light distribution, which is aimed at vertical surfaces. They are used for illuminating wall surfaces evenly. On lens wallwashers special lens reflection systems ensure even wall illumination. The light is spread out by lenses and directed onto the wall by wallwasher reflectors. The Darklight reflectors of the lens wallwashers are visible from below and are glare-free.

Grazing light wallwashers at a short offset from the wall most vividly enhance the surface texture, thereby accentuating the materials used.

Directional downlights are used for highlighting individual areas or objects with a medium to narrow light distribution. They combine the advantages of a downlight with the flexibility of directional spotlights. Above the rotationally
symmetrical Darklight reflector, the reflector lamps emit their beam of light perpendicularly downwards, yet they can be rotated by 360° and tilted up to 20°. Because the Darklight reflector ensures that a cone of light is formed from
directional luminaires, the cut-off angle is consistent in all directions.


The offset from wall should measure approximately half of the luminaire spacing in order to achieve sufficient brightness on the wall and well proportioned scallops of light. To attain an even illumination on a reference plane, the luminaire spacing should not exceed the mounting height h by more than 1.5:1. An optimal evenness is achieved when d = h. To obtain symmetrical scallops in a corner, one downlight must be positioned on the 45° diagonal. .


The offset from the wall should measure at least one third of the room height. Alternatively, the offset from the wall is where a 20 degree line projected upwards from the base of the wall intersects the ceiling. An optimum evenness is obtained when the luminaire spacing is the same as the offset from the wall, or at least does not exceed it by more than 1.5 times. Wallwashers only develop their optimal evenness as of a minimum number of three luminaires. The position of a wallwasher in a corner of a room should lie on the 45° line.

Downlights are a universal instrument for functional, architectonic and accentuating lighting.

Recessed downlights are inconspicuous architectural details, whereas surface-mounted downlights and pendant downlights act as features in the room. They should correspond to the architecture in their arrangement and form.