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Forum discussion
NC-v4 SSc6:Light pollution reduction
Anyone have experience documenting an uplight light fixture with a permanent structure above for “partial lumens above horizontal” calculation, please let me know
do you recall what types of calc or how intricate the details/calcs were to support the special circumstances on the form?
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Get the IES file into an analizer that will show you how many lumens are in each 10 degree zone. "Lumens Per Zone" on page 2.
https://www.visual-3d.com/tools/photometricviewer/default.aspx?sessionid=869404
Total lumen output of the fixture is: 7204 lumens.
Half are blocked on the building side: 3602 lumens shielded
Structure blocks 0-30 degree range: 29.3% of the remaining 3602 lumens = 1055 lumens shielded.
7204 - 3602 - 1055 = 2547 lumens of uplight for this fixture.
Something like this will be enough for documentation. The more complicated the angles are, the more complicated the math. The aiming of the fixture is the 0 degree angle of the IES file.