Classifying Outdoor Luminaires: The Limits of BUG
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The IES BUG rating system is useful for classifying outdoor luminaires when considering light trespass, sky glow, and glare in accordance with the Joint IDA-IES Model Lighting Ordinance (MLO). However, there are limits to what can be measured in the laboratory. Luminaires with uplight ratings of U0 or U1 or a glare rating of G0 may require further analysis when comparing manufacturers’ products.
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