A new measurement device for the in-depth investigation of the light distribution within buildings is being developed, whose aim is on one hand to assess the sunlight distribution inside scale models of buildings or rooms, and on the other hand to achieve truly time-efficient bidirectional goniophotometric measurements of coatings or materials. The types of materials expected to benefit from this detailed characterization are typically the ones used for complex fenestration systems such as novel solar blinds, new glazing or coating materials, sunlight and daylight-redirecting devices, as well as the many types of reflectors used in luminaires.