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UGR can only be calculated, not from the light distribution file such as ies to determine whether there is glare. This is the result of the relative relationship between the luminous surface of a lamp and the user's or observer's perspective, position, and background environment. In addition, according to the definition of UGR, UGR can not be used in luminaires with 65% or more indirect light, nor with narrow angle spotlight or asymmetric light.