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6 DESIGN The energy use and by this the performance of a luminaire is evaluated in Lux, as this is the easiest value to measure and control. In a cross-cultural study with four countries, Küller et al, 2006 suggest that people in colourful workplaces have better mood than people in neutral or colourless environments. The illuminance levels also differed over the year, from 30lx-2000lx in the four different countries, but showed no significant impact on mood at any time. (Küller et al., 2006) During February, the distance to the window did have a significant impact on mood. 6.3.2 Quality The quality of a light is evaluated in connection to the specific space and function. Light quality is mainly about how the light is perceived and how it supports the daily tasks, varying from work tasks to driving at night. To ensure a common denominator, the European standards were adopted and are continuously updated. As humans react to light both physically and psy- chically, the quality of light is evaluated, based on a combination of architec- tural factors, human needs, economy and environmental impact. (Lysviden. dk, no date) Evaluation of the quality can be divided into two groups, lighting quality and light quality. In trying to differentiate between the two, it is important to underline the importance of the lighting quality, when you work with people. This refers to atmosphere, glare and flicker etc. - factors that plays a great role in the experienced quality of the light in a space. (Interview G, 00:17:20) The lighting quality is hard to predict or measure before it has been installed. Light quality refers to the qualities of luminaires in terms of things you can specify in a tender e.g. CRI, size of the cone and lumen output etc. 6.3.3 Visual experience The visual experience is an important part of the specifications. This will depend on factors as contrast, light distribution, spatial awareness and colour. Uniformity The variety in light distribution is measured in uniformity, and is about shadows and contrast in a space. In a VR-experiment, findings suggest that people find light in spaces more interesting when a certain level of contrast is added to an architectural space (e.g bright direct sunlight entering the room, creating sharp shadows or added shapes and patterns in the shading). (Chamilothori, 2015) As PCBA ED 55 is a professional workplace, comfort and safety is of very high importance which could imply that it should be deigned with high uniformity. However, when the light distribution is less uniform and includes vertical illumination, this can add to the spatial aware- ness and the space will be perceived as more interesting. As CR focuses on the natural cycle, the indoor environment should vary as well, in both time and space. (Velux, 2013) Master thesis · MSc Lighting Design · Pernille Bech-Larsen · Fall 2017 79PDF Image | Healing with light
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