The LEED manual states that, under certain conditions, the lighting boundary can be modified (e.g.when the property line is adjacent to a public street, alley, or transit corridor, the lighting boundary may be moved to the center line of that street, alley, or corridor,...). However, this possibility is listed within the Light Trespass: Option 1. BUG Rating Method section only.
Does it apply to Light Trespass: Option 2. Calculation Method as well? Has anyone applied this succesfuly using simulation?
Glenn Heinmiller
PrincipalLam Partners
99 thumbs up
August 30, 2023 - 4:20 pm
From the credit language:
"Option 2. Calculation method
Do not exceed the following vertical illuminances at the lighting boundary (use the definition of lighting boundary in Option 1)."
We always use the BUG method for both Uplight and Trespass because it's easier. The only reason to use the Calculation method is if for some reason you can't comply with the BUG method, but might comply with the simulation method.
Lenka Matějíčková
Grinity s.r.o. VAT CZ046072282 thumbs up
August 31, 2023 - 4:21 am
Hi Glenn, thank you for the prompt answer
hassan izhar
September 12, 2023 - 10:02 am
The LEED manual specifies that the lighting boundary modification, such as shifting it to the centerline of a public street, alley, or transit corridor, is explicitly mentioned within the Light Trespass: Option 1 using the BUG Rating Method section. However, there is no specific mention of this modification in the Light Trespass: Option 2 Calculation Method. To determine whether this modification can be applied successfully using simulation in Option 2, it is recommended to consult LEED documentation or reach out to professionals with experience in LEED certification and lighting design. Success with this modification in Option 2 would likely depend on the specific circumstances of the project and the interpretation of LEED guidelines by the certifying authority.
Glenn Heinmiller
PrincipalLam Partners
99 thumbs up
September 12, 2023 - 10:56 am
Incorrect. The credit language explicitly states that the Lighting Boundary (as defined) is to be used for the Calculation Method
"Option 2. Calculation method
Do not exceed the following vertical illuminances at the lighting boundary (use the definition of lighting boundary in Option 1)."
Afogreen Build
www.afogreenbuild.comGreen Building Consultant
246 thumbs up
July 10, 2024 - 9:15 pm
Hi Lenka,
As stated on LEED BD+C v4 guide page 209, the lighting boundary definition for Option 2 shall use the definition of lighting boundary in Option 1.
Best regards – Afogreen Team Build