Abstract: Aspects of the present disclosure relate to systems for emitting light (e.g., substantially white light) with tunable circadian effects and substantially consistent color characteristics, and methods of making and/or operating the same. Certain embodiments described herein are systems comprising a plurality of light-emitting regions configured to emit light having certain circadian effects (e.g., melanopic ratio) and certain color characteristics (e.g., corrected color temperature (CCT), color rendering index (CRI)). According to some embodiments, the difference between the circadian effects of the light-emitting regions may be relatively large, and the difference between the color characteristics of the light-emitting regions may be relatively small. Each light-emitting region may comprise one or more light-emitting diodes (LEDs), each of which may be associated with one or more wavelength-converting materials (e.g., phosphors).