Visual efficiency

Visual Efficiency – A sustainable evaluation scale for modern architectural and lighting design

Mock-up test scenarios to validate and test the suitability of the existing user preference models. a) Typical fruit and vegetable counter of a supermarket; b) Replicated display area of a modern fashion store.

Duration: 1.2020 – 3.2021


Project team:

Dr.-Ing. Sebastian Babilon | Prof. Dr.-Ing. Tran Quoc Khanh
FB 18, Fachgebiet Lichttechnik

Prof. Anett-Maud Joppien | Dipl.-Ing. Bruno Johannbroer
FB 15, FG Entwerfen und Gebäudetechnologie


Project description:

Current architectural lighting design covers only the minimal values given by legal norms securing the possibility of visual tasks. This leads to a lack of acceptance, reduced well-being and sustainability. Our approach introduces a new evaluation scale called “Visual Efficiency” that expands the classical pure visual evaluation by including psychophysical and psychological factors, user preferences as well as energy efficiency. To develop such a new evaluation scale, a cooperation of both institutes is necessary to carry out trial studies intended to provide access to both quantitative and semantic rating data of architectural lighting situations. These are used for deriving a dedicated evaluation scale. The trial studies, designed with findings from both fields of research, take place in real-world scenarios to evaluate subjective ratings. Eventually, this will pave the way for achieving the vision of a general architectural lighting guide that includes all personal requirements to generate wellbeing to the user and a versatile, sustainable and efficient usage.