APPLICATION OF CIE GLARE INDEX FOR DAYLIGHTING EVALUATION

Discomfort glare is one of tile important indicators for-evaluation of lighting design. Disability glare from light sources, particularly wi ndows with outdoor views, is unavoidable. Glare should be permitted on ly to a level where human vision or viewing large video displays is no t seriously affected. The level of brightness of a source, the backgro und luminance, and the general luminance level within the visual field are tile main variables that need to be considered. This paper report s on the analysis of the glare due to the penetration of daylighting w ithin the Rock n Roll Hall of Fame and Museum. For the evaluation and comparison of lighting control systems combined with lighting installa tions, the quantitative relation suggested by CIE for glare, known as Glare Index, was used to serve as a basis for all the glare calculatio ns. The field studies to predict glare were undertaken using measured illuminance and luminance. The scale model photometry techniques were applied under real and simulated sky conditions to obtain glare condit ions within tile critical field of view. The field measurements were u sed as an input to computer simulation using the CIE Glare Index (CGI) function. The results show that the CGI and the Glare Racing (CR) wit h additional measured input are useful indicators for daylighting eval uation. The findings provide valuable information needed to make succe ssful project decisions regarding the lighting and day lighting contro l system. The shading system was proposed to reduce incoming glare to visitors' viewing of the space, the TV screens, and to inhibit photo-d egradation of displays, graphics, etc., within the retail area.