Glare is the one of the significant parameters, which is broadly classified as discomfort glare and disability glare. Glare is subjective and person dependent. Discomfort glare is mainly caused by excessive brightness of the artificial luminaire installed in the workplace. Unified Glare Rating (UGR) is used for quantifying discomfort glare at indoor workplaces. This paper presents UGR calculations of conference room by using DIALux lighting simulation software.3-D modelling and calculation of UGR with the help of software for various different LED lighting fixture distribution is considered. Results are prepared and shown in tabular and graphical representations. Comparison of results obtained from experimental determination and software calculations of UGR is carried out. Further, various LED lighting fixture positions which will give minimum glare are suggested. Conclusions are made about change in UGR with effect of different lighting fixtures and their respective positions and orientation of the line of sight of the observer.

Keywords: Light-Emitting Diode Luminaires, Discomfort Glare, Unified Glare Rating (UGR).