The Unified semantic Glare scale for GR and UGR indexes

The Glare Rating (GR) and Unified Glare Rating (UGR) are practically used measures of glare, respectively, for the outdoor and indoor workplaces. The glare sensation scale used for outdoors is also different than for indoors. That has been making impossible the comparison of glare level for outdoor and indoor workplaces, even if the sensation of experienced glare is the same. So the semantic scale should be the same. Based on the set of simulations in DIALux the GR and UGR values were determined for the same lighting conditions and then compared with adequate semantic scales. Some inconsistencies were found but using Eble-Hankins correction in semantic scale the new unified semantic glare scale has been elaborated and presented in this article.

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