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NC-2009 SSc8:Light Pollution Reduction

Allowance calculation with overlapping categories

These questions are in regard to exterior lighting power calculation. I am fine with the general approach and calculation. But I am not sure how to treat areas that are directly lighted from somewhere else. Do these areas that don’t have separate lighting contribute to the site lighting power allowance? Additionally I am unsure on the door width of revolving doors. Example: In my project the main entrance is covered by a 250m² canopy. The entrance consists of two revolving doors next to each other, separated by a structural column only. Next to the canopy is a walkway (>3m width) of 160m². The only lighting in this area is below the canopy ceiling which lights the walking area under the canopy, the doors and the walkway next to the canopy. To my understanding the total lighting power allowance for the lamps in the canopy is the sum of all allowances of the lighted areas: Area_canopy times LPA + Area_walkway times LPA + Width_revolving_doors times LPA with LPA meaning the specific lighting power allowance of the respective type of area in the respective LZ. Is this approach correct? Second question. Doors got an LPA in W/m door width. How do you measure the door width of revolving doors? Is it correct to measure total width of both door elements (enclosing circles)? Thanks, Jens

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