Content

Abstract
Discomfort glare rating (DGR) and Unified glare rating (UGR) are main models currently used as discomfort glare evaluation systems, both of which are calculated employing four factors including the luminaire size, the luminaire position relative to the observer, background luminance, and the luminaires number and location. This study aims at proposing a simple solution for reducing DGR and thereby increasing visual comfort perception (VCP) in an interior lighting system. The proposed solution is based solely on variations of luminaire surface area without change in other factors, e.g. candlepower and number and location of luminaires in the lighting system. To this end, firstly, the equations related to DGR were modified for a desired luminaire, and, secondly, by solving the modified equations, the new luminaire surface area was obtained, which caused DGR decrease and VCP improvement. Finally, by some modifications in the location of selected luminaires having main role on DGR, the VCP rose considerably.
References
1. J.A. Veitch, G.R. Newsham, Determinants of lighting quality I: State of the science, Journal of the Illuminating Engineering Society, 1998, 27, pp. 92Ц106. 2. W.K. Osterhaus, I.L. Bailey, Large area glare sources and their effect on visual discomfort and visual performance at computer workstations, in: Industry Applications Society Annual Meeting, 1992., Conference Record of the 1992 IEEE, IEEE, 1992, pp. 1825Ц1829. 3. K. Van Den Wymelenberg, M. Inanici, Evaluating a New Suite of Luminance-Based Design Metrics for Predicting Human Visual Comfort in Offices with Daylight, LEUKOS,2015, pp.1Ц26. 4. J. Wienold, J. Christoffersen, Evaluation methods and development of a new glare prediction model for daylight environments with the use of CCD cameras, Energy and buildings, 2006, 38, pp. 743Ц757. 5. IESNA, The IESNA lighting handbook: reference & application, 9th ed., 2000. 6. J.R. Benya, Controlling Glare, Deciphering this technical condition to create responsive Lighting Solutions, in: Architectural Lighting Magazine, 2010. 7. M.L. Eble-Hankins, C.E. Waters, VCP and UGR glare evaluation systems: a look back and a way forward, Leukos, 2005, #1, pp.7Ц38. 8. S. Carlucci, F. Causone, F. De Rosa, L. Pagliano, A review of indices for assessing visual comfort with a view to their use in optimization processes to support building integrated design, Renewable and sustainable energy reviews, 2015, 47, pp. 1016Ц1033. 9. R.G. Mistrick, A.-S. Choi, A comparison of the visual comfort probability and unified glare rating systems, Journal of the Illuminating Engineering Society, 1999, #28, pp. 94Ц101. 10. K. Van Den Wymelenberg, M. Inanici, A critical investigation of common lighting design metrics for predicting human visual comfort in offices with daylight, Leukos, 2014, #10, pp. 145Ц164. 11. W. Osterhaus, J. Veitch, Workshop on discomfort glare: Final report, in: 27th Session of the International Commission on Illumination, 2011. 12. W.K. Osterhaus, Office lighting: a review of 80 years of standards and recommendations, in: CONFERENCE RECORD-IEEE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING, IEEE INC, 1993, pp. 2365Ц2365. 13. P.R. Boyce, C.M. Hunter, C. Inclan, Overhead glare and visual discomfort, Journal of the Illuminating Engineering Society, 2003, # 32, pp. 73Ц88. 14. C. Marty, M. Fontoynont, J. Christoffersen, M.-C. Dubois, J. Wienold, W. Osterhaus, E. Carco, R.F. Carco, User assessement of visual comfort: review of existing methods, in, Technical report, Ingelux, Lyon, 2003. 15. W. Kim, J.T. Kim, A formula of the position index of a glare source in the visual field, in: 3rd International symposium on Sustainable Healthy Buildings, SHB2010, Seoul, Korea, 2010. 16. R.E. Levin, Position index in VCP calculations, Journal of the Illuminating Engineering Society, 1975, #4, pp. 99Ц105. 17. T. McGowan, S.K. Guth, Extending and applying the IES visual comfort rating procedure, Illuminating Engineering, 1969, 64, 253p. 18. M. Luckiesh, S.K. Guth, Brightness in visual field at borderline between comfort and discomfort (BCD), Illuminating Engineering, 1949, 44, pp. 650Ц670. 19. S.K. Guth, A method for the evaluation of discomfort glare, Illuminating Engineering, 1963, 58, pp. 351Ц364. 20. R.E. Levin, An evaluation of VCP calculations, Journal of the Illuminating Engineering Society, 1973, 2, pp. 355Ц361. 21. G.A. Fry, A simplified formula for discomfort glare, Journal of the Illuminating Engineering Society, 1976, 6, pp. 10Ц20. 22. S.K. Guth, Computing visual comfort ratings for a specific interior lighting installation, Illuminating Engineering, 1966, 61, 634p. 23. L.B. Ford, D. Ranieri, Glare evaluation calculations applied to visual display terminals, Journal of the Illuminating Engineering Society, 1990,19, pp. 3Ц20. 24. I. Lewin, The Determination of Luminaire Projected Area, Journal of the Illuminating Engineering Society, 1973, 2 pp. 418Ц421.
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