2024-03-28T15:45:11Zhttps://www.tdx.cat/oai/requestoai:www.tdx.cat:10803/6755282022-09-29T11:11:12Zcom_10803_183col_10803_329009
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El recorrido en espacios de baja intensidad lumínica
[Barcelona] :
Universitat Politècnica de Catalunya,
2022
Accés lliure
http://hdl.handle.net/10803/675528
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Espinoza Cateriano, Edgard Eduardo,
autor
Arquitectura, energia i medi ambient,
degree
1 recurs en línia (225 pàgines)
Tesi amb diferents seccions retallades per drets de l'editor
Tesi
Doctorat
Universitat Politècnica de Catalunya. Departament de Tecnologia de l'Arquitectura
2022
Universitat Politècnica de Catalunya. Departament de Tecnologia de l'Arquitectura
Tesis i dissertacions electròniques
Crespo Cabillo, Isabel,
supervisor acadèmic
TDX
The research focuses on how to illuminate low light intensity spaces. Different uses of those spaces serve as the start point for rethinking lighting design. The characteristics of light, surface and vision are essential to strengthen the link between the symbol and the object's meaning. The present study evaluates the illumination of places destined to reduce the light level without prejudice to the object's vision. Museums are one of those spaces where lighting design should lower light energy for conservation reasons. However, we observe the tendency to maintain high light levels in interior spaces where the purpose of choosing high light intensity is supposed to have a better vision. There are regulations that define the minimum and maximum light levels for workspaces, factories, offices or schools, i.e. the spaces where the requirements assume the condition of high light intensity. In low light intensity spaces, the parameters to consider in the lighting design have a different order of priority than in high light intensity spaces. Lighting intensity alterations produce vision changes and, therefore, changes in the visual perception of the scene. In scotopic vision, we have less ability to distinguish colours, and we get more peripheral vision sensitivity, contrary to photopic vision. Instead, the transition between scotopic and photopic vision, called mesopic vision, is characterized by having the advantages and disadvantages of both types of vision. The changes in the vision lead us to think about searching for different lighting design strategies depending on the light level in the environment.
In situations of low light intensity in which the observer is in the scotopic or mesopic vision, the parameters to be considered in the lighting design have a different hierarchy than in high light spaces. In that case, some lighting characteristics become secondary, but the colour temperature becomes the most important component of the lighting design to separate surfaces with similar luminance. This work has analysed such specific cases to establish how much the priorities of a lighting design that develops in these conditions change. It focuses on museums or exhibitions of archaeological heritage, meditation centres, or any other place where a low level of light is required to lead us to a state of calm and concentration.
In this study, we find that in mesopic and scotopic vision, when the predominant luminance values are below 10 cd/m2, the luminance contrasts have a shorter value range than in photopic vision, which ranges from 0.1 cd/m2 to 100,000cd/m2. In low light intensity spaces, the chromatic information of the surfaces decreases and the luminance values of the surfaces are very similar to each other. It is necessary to point out three effective strategies in lighting design. The first one is to use the colour temperature to differentiate luminance surfaces with a different meaning for the observer. The second one is to apply the high colour temperature to highlight elements that are foreign to the space but complement the user's visual information. The third one is to avoid light intrusion from the outside or any visual scene with luminance contrasts that exceed the ratio of 1:10. Therefore, we can conclude that in low light intensity spaces, using different light colour temperatures, if associated with different roles played by the surfaces, facilitates visual communication within the space.
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