THE DEVELOPMENT OF EVALUATION FOR DISCOMFORT GLARE IN LED LIGHTING OF INDOOR WORK PLACE - RELATIONSHIP BETWEEN UGR AND SUBJECTIVE EVALUATION

The design of discomfort glare in lighting of indoor work place uses UGR. However, it is not evident that the design is applicable in LED lighting. We have studied to examine the relationship between UGR and subjective evaluation in LED lighting. The experimental results demonstrated that it was difficult to design using UGR in LED lighting and there was luminance uniformity on luminous part causing it. Additionally, a formula modified UGR using the luminance uniformity proved effective in LED lighting. This study contributes a first step toward developing evaluation for discomfort glare in LED lighting.