architectural schools, research laboratories and large engineering firms such as: EPFL Solar Energy and Building Physics Laboratory LESO-PB in Lausanne (laboratory-made heliodon) uses a robotic heliodon for the simulation of direct light. This heliodon is combined with a sky scanning simulator (artificial sky) to predict the light distribution in a building over the entire year. The tool can replicate direct sunlight at any location on earth. This heliodon is a laboratory-made tool that allows daylighting simulations produced inside scale models for various research and design purposes. The daylighting laboratory manufactured this tool to limit energy savings and increase user comfort through better utilisation of daylighting in buildings. The instrument allows architects, designers, and planners to understand the effect of their architectural concepts. Besides limiting energy consumption, the laboratory focuses to increase the health of building occupants and productivity through efficient use of daylighting. Moreover, the robotic heliodon will help the laboratory’s aim to achieve energy efficiency and renewable energy in buildings and cities. National Laboratory for Housing and Sustainable Communities at Sonora, Mexico uses Orange heliodon produced by Betanit. The robotic heliodon is used for evaluating solar paths and their interaction with pre-existing or new constructions. By using a scale physical model under the robotic heliodon, it helps the project to measure the comfort and energy efficiency of the building. The heliodon is efficient as the project considers climatic conditions and the integration of energy sources. As the building is situated in a hot dry climate, the automatic heliodon helped in providing design solutions to offer indirect natural lighting and ventilation while avoiding direct sunlight into the building’s interior spaces. Due to the accuracy of the robotic heliodon, several studies with photos were used to compare a built house with a solar simulated scale model. The results revealed the efficiency of using appropriate design features in the building, which was derived from automatic heliodon. Arup (London), an engineering firm uses orange heliodon produced by Betanit in their lighting lab to help simulate the sun for their experiments and buildings. The lighting simulation from the heliodon helps in quickly identifying the daylight penetration on the buildings. Arup uses the robotic heliodon to design sustainable, energy-efficient, and award-winning concepts in lighting. The engineers and experts analyse daylighting of buildings by replicating the sun for their innovative projects. Furthermore, a thesis project, supervised by Dr Francesco Anselmo, also utilised the heliodon for experimental