LEED for Neighborhood Development integrates the principles of smart growth, urbanism and green building into neighborhood design, covering whole neighborhoods, portions of neighborhoods, and multiple neighborhoods
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The following are from the list of options, under ‘Universal Design features’ from which the project may select for compliance with this credit:
• Install motion‐detector lighting at entrance, in hallways and stairwells, and in closets, and • motion‐detector light switches in garages, utility spaces, and basements; and
• glare‐free task lighting in the kitchen
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The requirements apply to 90% of the total building floor area (rounded up to the next whole building) of all nonresidential buildings, mixed‐use buildings, and multiunit residential buildings four stories or more constructed as part of the project or undergoing major renovations as part of the project. Each counted building must comply with one of the options shown here. These options are:
1. Demonstrate an average improvement of 5% for new buildings, 3% for major building renovations, or 2% for core and shell buildings over ANSI/ASHRAE/IESNA Standard 90.1–2010, OR
2. Comply with the mandatory and prescriptive provisions of ANSI/ASHRAE/IESNA Standard 90.1–2010 while also complying with HVAC and service water heating requirements applicable to the each building, including equipment efficiency, economizers, ventilation, and ducts and dampers, for the appropriate ASHRAE 50% Advanced Energy Design Guide and climate zone, OR
3. Comply with the mandatory and prescriptive provisions of ANSI/ASHRAE/IESNA Standard 90.1–2010 while also complying with certain provisions of the Advanced Buildings Core Performance Guide.
The type and the size of the project might disallow using options 2 & 3.
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Up to 2 points may be earned with this credit by improving on the energy performance achieved in the previous prerequisite. This credit is not available to projects that used option 3 in that prerequisite.
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There are four basic requirements for this credit:
1. Comply with either the BUG rating method or the Calculation Method for all residential areas (however existing residential construction is exempt). For the BUG rating method, all luminaires must have a BUG rating of B2‐U2‐G2 or better (i.e. none of the ratings may be above 2). For the Calculation option, see the calculation options on the BD+C Light Pollution Reduction Credit. AND
2. For any portions of the circulation network not governed by national, state, or other superseding regulations, do not install street lighting unless conditions warrant the need for street lighting. New and existing street lighting luminaires must not emit any light above 90 degrees (horizontal), based on the photometric characteristics of each luminaire when mounted in the same orientation and tilt as specified in the project design or as currently installed. Exception for ornamental luminaires: Using the lowest MLO lighting zone for immediately adjacent properties, meet the requirements of the IES/IDA MLO, Table H. AND
3. All other areas have to meet the uplight and trespass requirements of the BD+C Light Pollution Reduction Credit. AND
4. Establish covenants, conditions, and restrictions (CC&R) or other binding documents that require continued adherence to the above requirements.
For convenience sake, the slides for the uplight and trespass requirements of the BD+C Light Pollution Reduction Credit have been repeated here.
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This credit provides two different options for meeting the uplight needs.
Option 1 involves selecting luminaires that have a low enough U Rating (based on the BUG rating system defined in IES TM‐15‐11, Addendum A). The threshold rating is a function of what lighting zone the site is in. So in Lighting Zone 0 may only use luminaires with a U0 rating while in lighting zone 3, luminaires may be rated U0, U1, U2 or U3.
Option 2 instead sets a threshold on how many lumens (as a percentage of the total luminaire lumens) may be emitted directly above the horizon. Again the threshold is a function of the lighting zone. So in lighting zone 0, no light may be emitted above the horizon, directly from the luminaires. In lighting zone 3, all of the non‐exempt luminaires as a whole may emit above the horizon, up to 3% of what they emit in total in all directions.
In both cases the definitions for lighting zones, as found in the MLO User Guide, should be used.
One of the main differences between these two options is that for option 1, every luminaire must comply while with option 2 it is the composite of all luminaires used on the site that matters thereby allowing a few individual luminaires to not comply.
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The Light Trespass requirement also has 2 options for compliance.
Option 1 again depends on the BUG rating of the luminaires being used. Besides being dependent on the lighting zone, the allowed rating is also dependent on:
• How it is mounted,
• How far it is mounted from the lighting boundary, and • How it is oriented
What is the ‘lighting boundary’? This boundary is typically at the property line but can be moved for three conditions:
1. When the property line is adjacent to a public area that is a walkway, bikeway, plaza, or parking lot, the lighting boundary may be moved to 5 feet (1.5 meters) beyond the property line
2. 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. AND/OR
3. When there are additional properties owned by the same entity that are contiguous to the property, or properties, that the LEED project is within and have the same or higher MLO lighting zone designation as the LEED project, the lighting boundary may be expanded to include those properties.
And what is ‘properly oriented’? The design must orient all luminaires that are less than two mounting heights from the lighting boundary such that the backlight points toward the 84
nearest lighting boundary line. However, building‐mounted luminaires with the backlight oriented toward the building are exempt from the backlight rating requirement.
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So, in a project located in lighting zone 3, a luminaire on a 25’ pole, located 40’ from the lighting boundary (1.6 MHs) must have a backlight rating of B4 or better and a glare rating of G3 or better. Note: the lower number means better.
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As with the uplight options, all of the luminaires have to meet option 1 of the trespass requirements.
But for option 2 what matters is finding the maximum vertical illuminance, overall, at and above the lighting boundary under the following conditions:
1. Calculation points may be no more than 5 feet apart. 2. Vertical illuminances must be calculated on vertical planes running parallel to the lighting boundary, 1. … with the normal to each plane oriented toward the property and perpendicular to the lighting boundary, 2. … and extending from grade level to 33 feet above the height of the highest luminaire.
It is permissible to use the BUG Rating Method for uplight and the Calculation Method for trespass and visa versa.
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The project design must meet the requirements described above for all exterior luminaires located inside the project boundary (except those listed under “Exemptions”), based on the following: • the photometric characteristics of each luminaire must be determined when mounted in the same orientation and tilt as specified in the project design; and • For the lighting zone of the project property (at the time construction begins). Classify the project under one lighting zone using the lighting zones definitions provided in the Illuminating Engineering Society and International Dark Sky Association (IES/IDA) Model Lighting Ordinance (MLO) User Guide.
And finally, the following exterior lighting is exempt from the uplight and trespass requirements, provided it is controlled separately from the nonexempt lighting: • specialized signal, directional, and marker lighting for transportation; • lighting that is used solely for façade and landscape lighting in MLO lighting zones 3 and 4, and is automatically turned off from midnight until 6 a.m.; • lighting for theatrical purposes for stage, film, and video performances; • government‐mandated roadway lighting; • hospital emergency departments, including associated helipads; • lighting for the national flag in MLO lighting zones 2, 3, or 4; and • internally illuminated signage.
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