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Photometric Imprecision Can Limit BUG Rating Utility

机译：光度不精确度可能会限制BUG评级实用程序

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摘要

The IES BUG rating system is useful for classifying outdoornluminaires when considering light trespass, sky-glow, and glare innaccordance with the joint IDA-IES Model Lighting Ordinance (MLO).nThere are, however, limits to what can be measured in the laboratory.nIES TM-15–11 requires that a luminaire with an uplight rating of U0nemits zero lumens into the upper hemisphere, while a U1 uplight ratingnor a G0 glare rating for high viewing angles requires fewer thann10 lumens. Given that the luminaire is emitting thousands of lumensnand that the laboratory room surfaces have a diffuse reflectance of atnleast two percent, it is physically impossible to measure zero lumens,nand extremely difficult to measure fewer than 10 lumens.nConsequently, a U0 glare rating can only be obtained by physicalnexamination of the luminaire and post-processing of the measurednphotometric data. Similarly, a U1 uplight rating or a G0 glare rating fornhigh viewing angles is likely the result of data manipulation. The MLOnUser’s Guide should therefore be revised to provide a procedure withinnthe ordinance text whereby an exception is allowed if a visualninspection of the physical luminaire shows that the uplight is negligible.
机译：IES BUG评级系统在考虑违反IDA-IES模型照明条例（MLO）的侵入光，天光和眩光时非常有用，可对室外灯具进行分类。但是，在实验室中可以测量的范围有限。 nIES TM-15–11要求，向上照度为U0的灯具向上半球的照明要求为零流明，而对于大视角，U1朝上光评级或G0的眩光等级要求的照明度小于n10流明。鉴于照明器发出的光通量为数千流明，并且实验室表面的漫反射率至少为2％，因此从物理上讲不可能测量零流明，也很难测量不到10流明.n因此，U0眩光等级只能可以通过对照明设备进行物理检测和对测得的光度数据进行后处理来获得。同样，对于高视角，U1上光等级或G0眩光等级可能是数据处理的结果。因此，应修订《 MLOn用户指南》，以在法规文本中提供一个程序，从而在物理照明器的目视检查表明上光可以忽略的情况下允许例外。

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