LI 10463 CS v4 Lighting Savings for Tenant Spaces | U.S. Green Building Council
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Created on July 8, 2017

LEED Interpretation

ID# 10463

Rating System

LEED BD+C: Core and Shell

Rating System Version

v4 - LEED v4

Inquiry

ASHRAE 90.1 Appendix G states: “Where a complete lighting system exists, the actual lighting power for each thermal block shall be used in the model.” This allows credit to be claimed in tenant spaces when “a complete lighting system” for these spaces designed and installed within the Core & Shell project scope of work. However, for tenant spaces in a Core & Shell building where tenant sales and lease agreements do not address future changes to the installed lighting, it is unclear what constitutes “a complete lighting system.”

If the documentation demonstrates that tenant space layout is complete, and that a lighting system has been designed and installed such that the tenants most likely to occupy the space can use the space for its intended function without alterations to the lighting system, shall this be considered a “complete lighting system”?

If space layout is incomplete, and a lighting system has been installed that provides adequate illumination for the open space in its current configuration, shall this be considered a “complete lighting system”?

Ruling

Clarification is requested regarding the definition of a “complete lighting system” for projects where credit is claimed for lighting installed in tenant spaces within the Core & Shell project scope of work.

Core and Shell projects which design, install, and commission complete lighting systems, and demonstrate that the lighting is sufficient for the anticipated tenant uses may use the installed lighting power in the Proposed case energy model for EA Prerequisite: Minimum Energy Performance. All relevant ASHRAE 90.1 Section 9.4 Mandatory Provisions must be designed, installed, and commissioned in the tenant space within Core & Shell project scope of work.

Projects installing complete lighting systems in tenant spaces may not claim more than a 20% reduction in lighting power density for the purposes of prerequisite and credit achievement calculations. Alternatively, to claim more than 20% lighting power savings for a complete lighting system, the greater of the installed lighting power or the tenant required lighting power density may be modeled in the proposed case if a binding owner commitment letter with a sample tenant sales and lease agreement is provided establishing tenant lighting power requirements.



Applicable Credits

Name : Minimum energy performance
Rating system : New Construction,Core and Shell,Schools - New Construction,Healthcare,Hospitality - New Construction,Warehouse and distribution centers - New Construction,
Rating system version : v4

Name : Optimize energy performance
Rating system : New Construction,Core and Shell,Hospitality - New Construction,Warehouse and distribution centers - New Construction,
Rating system version : v4

Credit Name Minimum energy performance
Credit Category Energy & atmosphere
International Applicable Internationally applicable
Campus Applicable Not campus applicable