Gennaro Spada

HDR luminance mapping analysis system for visual comfort evaluation

The use of daylight in interior design is becoming more and more common and also its use for energy saving reasons that it is now possible to get through an appropriate daylighting and an optimal integration of day/ electric light. At the same time, in a working environment, the use of daylight for the indoor lighting has an influence on satisfaction, as well as on performance and therefore on labor productivity. In this paper, the definition of a system set up to analyze the field of vision based on the High Dynamic Range (HDR) analysis is presented. More specifically, the system allows to evaluate easily not only the photometric parameters but also the geometric ones that are needed for any type of quality evaluation of the lit environment. In particular, a field application related to the Daylight Glare Index (DGI) calculation has been presented. The proposed system allows a rapid evaluation and an index comparison for real situations, also giving the opportunity to take into account different evaluation criteria in the future.

Photometric characterisation of small sources with high dynamic range illuminance mapping

In this paper a system for obtaining the luminous intensity distribution of a small light source, based on high dynamic range imaging, is described. The system uses a dark room, a lambertian screen and a video-luminance-meter mounted on a workbench. The luminous intensity distribution of the light source is derived from the illuminance map on the screen by applying the photometric inverse law. The geometry of the system is presented and the measurements’ uncertainties are estimated. Finally, an application to a LED source is presented.