APPEARANCE OF TYPICAL INTERIOR MATERIALS

Scientific publication „Influence of lighting conditions on the appearance of typical interior materials“ by Dr. Ruta Lasauskaite Schüpbach, Markus Reisinger und Björn Schrader is published in Color Research & Application. The article reports two experiments that investigated how lighting influences perception of various materials. The first experiment shows that cool color temperature of the light source is preferred for materials of blue color (cold hue). Warm color temperature of the light source is preferred for materials of warm hue materials and those materials that have natural reference (e.g., grass). The second study shows that materials tend to appear softer under LED light source compared to other light sources in our setup. Finally, future directions in this research area are discussed.

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COLOR AND LIGHT SPACE IN LUCERNE

To demonstrate and study the spatial interaction of light and color the department of interior architecture at Lucerne University of Applied Sciences and Arts runs a dedicated workshop room. Equipped with various types of light sources and a rich collection of painted samples the workspace is suitable for design work as well as for perception studies.

Farblichtraum

To study qualities of the spatial experience is the core activity in the center of competence for interior architecture. With innovative partners these insights are translated to prototype spaces and future solutions.

Contact page at Lucerne University of Applied Sciences and Arts
http://www.hslu.ch/licht

 

 

3D LIGHT DESCRIPTION

For luminaires the description of the light distribution
is essential to characterize a product. For scenes the description of the light field is not considered of such high importance, but as computers enabled us to produce them the awareness might increase.

Light field of an asymmetric lit room

For viewing the above picture please use red-cyan stereo glasses. The picture itself shows the light field structure of an asymmetrically lit enclosed space. More details on the procedure to generate such 3D representations of the illumination you find in the following presentation.

For viewing the above picture please use red-cyan stereo glasses. The picture itself shows the light field structure of an asymmetrically lit enclosed space. More details on the procedure how to generate such 3D represenations of the illumination you find in the following presentation.

In case you started to ask yourself why do light tubes bend and what can they tell, than continue to read.

What do light tubes tell?
Light tubes represent global characteristics of the illumination field in a scene. The tubes illustrate direction of energy transfer; hence reveal the light fields structures. Each light tube gives information about light flux, the intensity of light on a point and the direction of light for that point in space. There is no direct information about light density contained. A perfectly diffuse lit space with equal amounts of light coming from all directions will show no net flux transfer, hence the light vector is 0 and there is no flux line and respectively no light tube.
The information about lights directionality can indicate how lively a scene will be perceived. A varied structure is likely to be more vigorous perceived as a basal structure. The representation through tubes can exemplify the structure rather well as light arriving at points in space varies smoothly from place to place (except at defined boundaries as surfaces or shadows).
Characteristics of light tubes are best explained with an example. In the following three movies are three light situations characterized by simple descriptions of the light field with six tubes only.

1. Room illuminated by a single centrally located light source.

2. Room asymmetrically lit by three diffuse light sources.

3. Room lit by applying wall washing illumination along two walls.

Why do light tubes bend?
For the understanding of flux lines it is important to distinguish them from light rays. Light rays can and do cross each other, flux lines cannot. The illumination in a room can be described by an infinite number of flux lines. For each flux line the direction coincides at every point with the direction of the illumination vector at that point. Through each point only a single flux line can pass. At places with an illumination vector of 0 there is no flux line. To represent the light field it is convenient to replace the infinite number of flow-lines by a finite number of tubes of flux, the sides of which are formed by flux-lines. Generally flux tubes start from light sources and proceed through space until a surface is reached. The shape of the tubes is determined by the light vector at points in space and as the light vector directions are changing from point to point tubes show curvature.

cite page as: http://info.lightingresearch.eu/flow/