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Credit language
Requirements
Establishment
Option 1. Lighting control (1 point)
For at least 50% of individual occupant spaces, have in place individual lighting controls that enable occupants to adjust the lighting to suit their individual tasks and preferences, with at least three lighting levels or scenes (on, off, midlevel). Midlevel is 30% to 70% of the maximum illumination level (not including daylight contributions).
For all shared multi-occupant spaces, meet all of the following requirements.
- Have in place multizone control systems that enable occupants to adjust the lighting to meet group needs and preferences, with at least three lighting levels or scenes (on, off, midlevel).
- Lighting for any presentation or projection wall must be separately controlled.
- Switches or manual controls must be located in the same space as the controlled luminaires. A person operating the controls must have a direct line of sight to the controlled luminaires.
AND/OR
Option 2. Lighting quality (1 point)
Choose four of the following strategies.
- For all regularly occupied spaces, have in place light fixtures with a luminance of less than 2,500cd/m2 between 45 and 90 degrees from nadir.
Exceptions include wallwash fixtures properly aimed at walls, as specified by manufacturer’s data, indirect uplighting fixtures, provided there is no view down into these uplights from a regularly occupied space above, and any other specific applications (i.e. adjustable fixtures).
- For the entire project, have in place light sources with a CRI of 80 or higher. Exceptions include lamps or fixtures specifically designed to provide colored lighting for effect, site lighting, or other special use.
- For at least 75% of the total connected lighting load, have in place light sources that have a rated life (or L70 for LED sources) of at least 24,000 hours (at 3-hour per start, if applicable).
- Have in place direct-only overhead lighting for 25% or less of the total connected lighting load for all regularly occupied spaces.
- For at least 90% of the regularly occupied floor area, meet or exceed the following thresholds for area-weighted average surface reflectance: 85% for ceilings, 60% for walls, and 25% for floors.
- Meet or exceed the following thresholds for area-weighted average surface reflectance: 45% for work surfaces and 50% for movable partitions.
- For at least 75% of the regularly occupied floor area, meet ratio of average wall surface illuminance (excluding fenestration) to average work surface illuminance that does not exceed 1:10. Must also meet strategy E, strategy F, or demonstrate area-weighted surface reflectance of at least 60% for walls.
- For at least 75% of the regularly occupied floor area, meet ratio of average ceiling illuminance (excluding fenestration) to work surface illuminance that does not exceed 1:10. Must also meet strategy E, strategy F, or demonstrate area-weighted surface reflectance of at least 85% for ceilings.
- [India ACP: Interior Lighting]
Performance
None.
Alternative Compliance Paths (ACPs)
India ACP: Interior Lighting
I. Projects in India may, in all regularly occupied spaces, meet or exceed the lower
illuminance levels listed in the Bureau of Indian Standards (BIS) code -- IS 3646 (Part 1): 1992, Table 1- Recommended Illumination.
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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
What happened to the IEQ Space Matrix that was available to version 2009 projects? What should I reference to determine how spaces in my building should be categorized for this credit?
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How do we determine if we meet the mid-level requirement of 30% to 70% of the maximum illumination level?
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Do we need to collect square footage details for Option 1, like we did for multi-occupant spaces under EBOM 2009?
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A tenant who uses a different lighting vendor from the base building will not participate in the LEED project, so we can’t confirm or document the information needed for various strategies under Option 2. This tenant is less than 10% of the total building floor area. Can we exclude them from this credit?
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Addenda
4/1/2015 – Updated: 3/29/2018
Regional ACP
Description of change: After strategy H, add the following additional strategy:
"I. Projects in India may, in all regularly occupied spaces, meet or exceed the lower
illuminance levels listed in the Bureau of Indian Standards (BIS) code -- IS 3646 (Part 1): 1992, Table 1- Recommended Illumination."
Internationally Applicable: Yes
4/1/2015 – Updated: 4/16/2015
Form Update
Description of change: Revised form and Interior Lighting Calculator to include India ACP under Option 2.
Internationally Applicable: Yes
10/1/2014 – Updated: 2/14/2015
Form Update
Description of change: Revised summary for C. Lamp Life from "Connected lighting load with rated life greater than 24,000 hours (or L70 for LED sources)" to "Connected lighting load with rated life of at least 24,000 hours (or L70 for LED sources)"
Revised errors in the ratio calculations for G. Surface Illuminance Ratio: Wall to Work Surface and H. Surface Illuminance Ratio: Ceiling to Work Surface
Internationally Applicable: No
7/1/2014 – Updated: 2/14/2015
Reference Guide Correction
Description of change: Table 1, modify item D so it reads "25% connected lighting load for regularly occupied spaces."
Internationally Applicable: No
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Documentation toolkit
The motherlode of cheat sheets
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