Assessment of luminance distribution using HDR photography
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This paper presents the findings of a study that evaluates a procedure that uses available computer tools to assess the luminance distribution of spaces using High Dynamic Range (HDR) photography. We tested available software packages to create a series of HDR images with different exposure (f-stops), resolution, digital cameras, wide-angle lenses, luminance ratios, lighting levels, and type of lighting systems (daylighting and electric lighting) that were used for comparison. The HDR images were then imported into the RADIANCE lighting simulation program, to be converted into the human visual sensitivity, false color and iso-contour images, where a more comprehensive set of luminance distribution can be displayed. The results of the evaluation indicated that the measured luminance distribution generated with Photosphere and the RADIANCE lighting software were similar to the spot luminance measurements taken in an existing space with a Minolta LS-100 Luminance meter. The differences between the measured luminance values and the generated ones with HDR photography and the RADIANCE program varied between -0.7 to 3.5% of the average luminance measurement, which makes it an ideal procedure to use for the evaluation of the lighting quality of indoor and outdoor spaces.
Proceedings of the Solar World Congress 2005: Bringing Water to the World, Including Proceedings of 34th ASES Annual Conference and Proceedings of 30th National Passive Solar Conference
