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Could there be more to light than lux and mEDI? Light, mood and mental health The fact that light is beneficial to mental health is well established – light therapy has been demonstrated to help not only persons with seasonal depression, but transdiagnostically, including major and bipolar depression, and is showing promise for Parkingson’s or even eating disorders. Regular high doses of photons lift our spirits and so we place patients in front of light boxes. But could we be doing more? could we do better? Should we perhaps think out of the box?

When it gets dark and we switch on the lights, we want to be surrounded by comfortable light. The light source is typically an LED that is combined with reflectors and lenses to send the light where you want it to be. Given the light distribution of the source and the desired target distribution, what is the optical system (reflector, lens or a combination) that does the job? That is the question we need to answer! This field is freeform design and it is used for, e.g., car lights, luminaires and street lights. The optical surfaces are referred to as freeform since they do not have any symmetries. Martijn Anthonissen works at Eindhoven University of Technology in the Computational Illumination Optics group. This is one of the few mathematics groups worldwide working on optical design problems from illumination optics. The research focuses on non-imaging freeform optics, imaging optics and improved direct methods .

In Bright Environments, Digital Twins of the human subject are used in real-time search for good light settings The research track Bright Environments thrives to make Intelligent Lighting systems work. ILI has the unique opportunity to bring together insights about how light affects human wellbeing, comfort or productivity with interactive and automated electronics systems. Interaction design can be combined with AI or compute-efficient low-power statistical signal processing. The Bright Environments track brings these disciplines together. In this talk, Prof. Jean-Paul Linnartz (EE) illustrates this ambition with examples of personalizing Human Centric Lighting. The human circadian rhythm is estimated, and light exposure patterns are jointly optimized to balance a healthy bio-clock with acute lighting performance objectives. Sensor data is used extensively, but the imperfections and artefacts inherent to low-power wireless IoT and person-worn sensors are carefully weighed in signal processing algorithms. A system architecture that implements this continuously tracks the human experience in a set of a digital twins that mimic the experience of the human subjects. Control strategies can be tested on these human twins, before released for real-time execution in a Bright Environment.

Do we still need research into the effects of light on human well-being, comfort, and productivity if artificial intelligence will control our lamps in the future? Will AI bombard us with satisfaction surveys all day, asking us to "please take a minute to rate your lighting experience today" to train the system?