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Light is indispensable to human beings. Koga Laboratory is working on design, assessment and control of indoor and outdoor luminous environments in terms of environmental physics and human psychology and physiology through visual perception.
One of the main research topics is digital transformation in building environment design. For the healthful building environment, we have launched research on the parametric design process for the building envelope and daylight openings. Immersive virtual environments and digital 3D urban models are extensively used as a research method. The next challenge is to put moving digital humans in the virtual space.
Another research focuses on daylighting and integrative lighting with solid-state lighting (SSL). In order to present an approach to designing luminous space for comfort and health, we are working on human visual responses to light with different spectral power distributions. Those responses are relevant to visual and non-visual effects of optical radiation. Conventional metrics of light are insufficient to quantify various visual responses and perception through retinal photosensitive cells (rods, cones and intrinsically photosensitive retinal ganglion cells). We have also worked on automotive lighting as well. Issues were glare control for LED head and rear lights and improvement of the indoor visual environment.
Besides, we are involved in international standardization activities for the indoor visual environment and lighting in buildings. Dr. Koga developed ISO standards on daylight opening design for sustainability principles in visual environment (ISO 19454), design process for the indoor visual environment (ISO 16817) and so on. We have participated in research projects (tasks) on daylighting in the Solar Heating and Cooling Programme (SHC) of the International Energy Agency (IEA). A new task “Low Carbon, Hight Comfort Integrated Lighting” started in 2023.
