The UGR is the Unified Glare Ratio, and it is a value that measures the glare produced by a luminaire to the human eye. According to the recommendations of European regulation EN 12464-1, for office spaces, UGR values ≤19 are recommended to ensure a comfortable visual environment. In general, environments with UGR>28 are considered bad practices. And in cases where the UGR is less than 16, glare is not considered to be present.