A corner location keeps the lights away from potential threats, while providing opposing beam directions that reduce shadows and dark areas, enhancing overall interior illumination quality
Color appearance models such as CIECAM02 are sometimes capable of taking these effects into account and could possibly be used as the basis metrics of illumination quality
similar to proposed gamut-area indices but based on dimensions of perceived colorfulness, which grows with luminance, instead of perceived chroma, such as CIELAB C*, which does not grow with luminance.
Preventing light trespass altogether may mean sacrificing illumination quality
. In many instances, a compromise maybe better: minimize light trespass by controlling the illumination.
and Moss-man, M., "Using core sunlighting to improve illumination quality
and increase energy efficiency of commercial buildings", Association of Mechanical Engineers International Conference on Energy Sustainability, May 2010.