UGR 19 Vs UGR 16 is mainly about glare control level. UGR means Unified Glare Rating, a method used in indoor lighting design to evaluate discomfort glare. A lower UGR value shows better glare control. In many office lighting projects, UGR below 19 is commonly used as a comfortable target, while UGR 16 is stricter and often required for spaces with higher visual comfort needs.