Abstract
The heritage buildings generate specific problems for electrical installations, with supplementary request from lighting systems. The continuous trends towards modernization are traditionally in conflict with the conservation of the architectural details. This major constraint must be considered for new circuits, but also for luminaire, when retrofit is the main approach. After the esthetical considerations, the engineering approach raises a problem in connection with the dimensioning methods. For heritage buildings, the lighting systems must cover infinity of situation, very different from classical designing methods, based on Utilization Factor or Direct Illumination Calculus for orthogonal situations. An original method of calculation is proposed, based on analytical geometry, useful for any orientation of the working plane. Even this method has important limitations, generated by the specifically architectural details, and a lighting simulation is necessary. Based on DIALuxEVO7, specific methods are presented. The importance of results interpretation is also underline.
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