We are working on a project where recessed pot lights are installled under a canopy. As per IES TM-15-11, Addendum A, "to determine BUG ratings, the photometric data must include data in the upper hemisphere unless no data is emitting above 90 degrees vertical", these lights do not emit light above the 90 degree threshold and is N/A to the BUG rating option of the credit. However, we are wondering if it would it still have to meet the light trespass requirements using the calculation method under Option 2.
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Bill Swanson
Sr. Electrical EngineerIntegrated Design Solutions
LEEDuser Expert
731 thumbs up
August 19, 2022 - 10:09 am
If a light is fully recessed in a canopy with no lens below it has no uplight. The IES files don't get modified from surrounding surfaces. It will either show uplight or it won't. If the file does show uplight then you can use the calculation method with most or all of the uplight being shielded by the canopy.
Light trespass is a separate item and still needs to be documented for compliance. You can use either IES or calculation method to show compliance with light trespass requirements.