A proposed lighting-design space: circadian effect versus visual illuminance

In this work, we propose a lighting-design space that allows the exploration of combinations of circadian effect and brightness (visual lit appearance). To demonstrate the feasibility of this approach, we develop a color-mixing method for four-channel color-tunable LED light sources, and maximize the gamut of the proposed space. This gamut represents the possible design objectives that interior lighting designers can target. As an example of application, we demonstrate that our color-tunable LED solution can be used to dynamically simulate both circadian and visual properties of daylight.