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If a light is under an overhang, is its U rating always 0?

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NC-v4 SSc6:Light pollution reduction

BUG method based on angle of mounting

Does the angle of installation of the lamp influences its BUG rating?

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Bill Swanson
Sr. Electrical Engineer
Integrated Design Solutions
LEEDuser Expert
516 thumbs up

Fri, 06/01/2018 - 14:22

Absolutely.  The whole BUG rating system is based on the quantity of light in specific angles.   Adjustable lighting is a nightmare for complying with the BUG system.  Worst case angle must be used.  This usually means a lot of glare and uplight that will exceed permitted levels.

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