Luminous reflectance - gypsum mirrors the light

The gypsumboard surface is ideal for applying various types of paints and laminates. The nature of the surface can vary from high-gloss to matt surfacing. For measuring luminous reflectance, a standard measuring method is used, DIN 5036, Part 3. The subjective perception can vary from the measured values, however, since in addition to the values for reflection the gloss and structure of the surface need to be taken into consideration.

Gloss has a bearing on reflections at very oblique incidences of light. Thus great mattness gives very little reflection. The structure also affects reflection. Perforated boards reflect light back in many directions and thus create a great scattering of light. Both are instrumental in giving gypsum products minimum reflection and take excellent advantage of reflected light, so rooms in which gypsum ceilings have been used are perceived as being light and pleasant.

Painted Danoline ceilings are supplied as standard with a white gloss 5 surface (NCS 0700). The painted surface has a fine, matt texture, providing great light dispersion to ensure optimal exploitation of working light without troublesome reflections. In functional terms, the surface can beneficially be used in rooms where work is done at computer monitors. Gloss 5 paint and dark colours create far fewer reflections but should only be used in rooms where there is adequate lighting, e.g. in the form of large window surfaces.

Gloss 15 surfaces should only be used as a special finish, since less light reflection is achieved together with a greater mirror reflection. In functional terms, high-gloss surfaces have the advantage of being easier to clean, and dirt is less prone to cling to the surface.

Luminous reflectance
Measurements of reflection have been carried out in accordance with DIN 5036, Part3, DLO measuring instruction B15-1:

Product	Surface	Reflective
Quadril Q1	Gloss 5	75,1%
Micro M1	Gloss 5	72,1%
Globe G1	Gloss 5	72,8%
Globe G1	Gloss 15	71,5%
Regula R plain	Gloss 5	82,6%
Regula R plain	Gloss 15	80,8%
Regula plain	White faced	86,3%