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LEED v4
Existing Buildings
Sustainable Sites
Light pollution reduction

LEED CREDIT

EBOM-v4 SSc4: Light Pollution Reduction 1 point

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SPECIAL REPORT

LEEDuser expert

Bill Swanson

PE, LEED AP BD+C

Integrated Design Solutions
Sr. Electrical Engineer

SPECIAL REPORT

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Credit language

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© Copyright U.S. Green Building Council, Inc. All rights reserved.

Requirements

Establishment

Option 1. Fixture Shielding
Shield all exterior fixtures (where the sum of the mean lamp lumens for that fixture exceeds 2,500) such that the installed fixtures do not directly emit any light at a vertical angle more than 90 degrees from straight down.

OR

Option 2. Perimeter Measurements
Measure the night illumination levels at regularly spaced points on the project boundary, taking the measurements with the building’s exterior and site lights both on and off. At least eight measurements are required, at a maximum spacing of 100 feet (30 meters) apart. The illumination level measured with the lights on must not be more than 20% above the level measured with the lights off.

Performance

None. See all forum discussions about this credit »

What does it cost?

Cost estimates for this credit

On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.

Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.

This information is also available in a full PDF download in The Cost of LEED v4 report.

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Frequently asked questions

We have parking garage signs on the building exterior. We’re attempting Option 1 Fixture Shielding. Does the parking signage need to meet the requirements too?

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What about lights on the roof? Do they have to comply?

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What about exterior lighting owned by tenants?

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My building doesn’t have any exterior lighting (no site lighting and no building-mounted lighting). Is my project eligible for this credit?

The answer to this question is available to LEEDuser premium members. Start a free trial »

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See all forum discussions about this credit »

Addenda

1/27/2017Updated: 1/27/2017
Reference Guide Correction
Description of change:
Revise the Campus Approach section to read: "Eligible. For Option 1, compliance must be demonstrated for all fixtures within the LEED Campus Boundary. For Option 2, compliance may be demonstrated at the LEED Campus Boundary."
Campus Applicable
Yes
Internationally Applicable:
Yes
10/1/2014Updated: 2/14/2015
Reference Guide Correction
Description of change:
Delete the first row from the table ("Fixture schedule showing exterior luminaire and lumen information").
Campus Applicable
Yes
Internationally Applicable:
Yes
See all forum discussions about this credit »

Documentation toolkit

The motherlode of cheat sheets

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LEEDuser expert

Bill Swanson

PE, LEED AP BD+C

Integrated Design Solutions
Sr. Electrical Engineer

Get the inside scoop

Our editors have written a detailed analysis of nearly every LEED credit, and LEEDuser premium members get full access. We’ll tell you whether the credit is easy to accomplish or better left alone, and we provide insider tips on how to document it successfully.

USGBC logo

© Copyright U.S. Green Building Council, Inc. All rights reserved.

Requirements

Establishment

Option 1. Fixture Shielding
Shield all exterior fixtures (where the sum of the mean lamp lumens for that fixture exceeds 2,500) such that the installed fixtures do not directly emit any light at a vertical angle more than 90 degrees from straight down.

OR

Option 2. Perimeter Measurements
Measure the night illumination levels at regularly spaced points on the project boundary, taking the measurements with the building’s exterior and site lights both on and off. At least eight measurements are required, at a maximum spacing of 100 feet (30 meters) apart. The illumination level measured with the lights on must not be more than 20% above the level measured with the lights off.

Performance

None.

In the end, LEED is all about documentation. LEEDuser’s Documentation Toolkit, for premium members only, saves you time and helps you avoid mistakes with:

  • Calculators to help assess credit compliance.
  • Tracking spreadsheets for materials purchases.
  • Spreadsheets and forms to give to subs and other team members.
  • Guidance documents on arcane LEED issues.
  • Sample templates to help guide your narratives and LEED Online submissions.
  • Examples of actual submissions from certified LEED projects.

We have parking garage signs on the building exterior. We’re attempting Option 1 Fixture Shielding. Does the parking signage need to meet the requirements too?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

What about lights on the roof? Do they have to comply?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

What about exterior lighting owned by tenants?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

My building doesn’t have any exterior lighting (no site lighting and no building-mounted lighting). Is my project eligible for this credit?

The answer to this question is available to LEEDuser premium members. Start a free trial »

(If you're already a premium member, log in here.)

1/27/2017Updated: 1/27/2017
Reference Guide Correction
Description of change:
Revise the Campus Approach section to read: "Eligible. For Option 1, compliance must be demonstrated for all fixtures within the LEED Campus Boundary. For Option 2, compliance may be demonstrated at the LEED Campus Boundary."
Campus Applicable
Yes
Internationally Applicable:
Yes
10/1/2014Updated: 2/14/2015
Reference Guide Correction
Description of change:
Delete the first row from the table ("Fixture schedule showing exterior luminaire and lumen information").
Campus Applicable
Yes
Internationally Applicable:
Yes

LEEDuser expert

Bill Swanson

PE, LEED AP BD+C

Integrated Design Solutions
Sr. Electrical Engineer

See all LEEDuser forum discussions about this credit » Subscribe to new discussions about EBOM-v4 SSc4