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NC-2009 SSc8:Light Pollution Reduction

SS CREDIT 8:LIGHT POLLUTION REDUCTION- UPLIGHT ALLOWANCE

I have a adjustable fixture mounted on the ground to uplight the tree. The initial fixture lumen above 90 degrees from nadir is 0 which is full cut off fixture. How can I sum up fixture lumens above 90 degree from nadir when the tilted angle of the fixture varies from 150 degree from nadir and 180 from nadir ects.... Am I supposed to include all fixture lumens to be 90 degree from nadir since it's adjutable? Am I supposed to include whole fixture lumen to be

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