Integrative Lighting Design: How to Optimize Visual and Non-visual Effects in a Cell Office

The objective of this paper is to outline fundamental principles for the electric lighting design of workplace environments such as offices. The study considers both the suggested guidelines and values for non-visual light design and the specifications for visual tasks dictated by the EN 12464-1:2021. When properly balanced, the two distinct procedures – for the visual task and for the non-visual responses - can lead to an integrated lighting design: This integration ensures that the office environment provides both well-being and optimal visibility for tasks that require good lighting conditions. Various lighting scenarios, using only electric lighting, were analysed under different conditions and parameters (three different photometries, three different spectra and three environmental wall reflectance configurations). The choice of luminaire photometry is critical in achieving a well-rounded integrated design, as observed in the examination of various scenarios. Depending on the goals set, the designer can also decide whether to use a spectrum that stimulates the eye the most: Different spectra with similar correlated colour temperatures were compared to evaluate the impact on design purposes. The next step of the research work is to consider the daylight into the project and an evaluation of the potential energy savings it can offer.