15 October 2012 Measurements of UGR of LED light by a DSLR colorimeter
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Abstract
We have developed an image-based measurement method on UGR (unified glare rating) of interior lighting environment. A calibrated DSLR (digital single-lens reflex camera) with an ultra wide-angle lens was used to measure the luminance distribution, by which the corresponding parameters can be automatically calculated. A LED lighting was placed in a room and measured at various positions and directions to study the properties of UGR. The testing results are fitted with visual experiences and UGR principles. To further examine the results, a spectroradiometer and an illuminance meter were respectively used to measure the luminance and illuminance at the same position and orientation of the DSLR. The calculation of UGR by this image-based method may solve the problem of non-uniform luminance-distribution of LED lighting, and was studied on segmentation of the luminance graph for the calculations.
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Shau-Wei Hsu, Cheng-Hsien Chen, Yuh-Der Jiaan, "Measurements of UGR of LED light by a DSLR colorimeter", Proc. SPIE 8484, Twelfth International Conference on Solid State Lighting and Fourth International Conference on White LEDs and Solid State Lighting, 848415 (15 October 2012); doi: 10.1117/12.928345; https://doi.org/10.1117/12.928345
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