855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 181

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Lighting Design efficient lighting that reduces connected lighting power by the specified percentage below the referenced version of ASHRAE Standard 90.1 .

Use either the building area method compliance path ( ASHRAE 90.1, Section 9.5) or the Spaceby-Space Method Compliance Path (Section 9.6) to calculate the lighting power allowance.

Include all new and existing interior lighting in the project boundary in the connected lighting power determination. For any existing or additional lighting power fixtures that are excluded from the ASHRAE 90.1 lighting power allowance calculated in Section 9.5 or 9.6, report this lighting power identically for the connected lighting power and for the adjusted ASHRAE 90.1 lighting power allowance used for this credit.

Cooling, heating, and SWH efficiency Install HVAC and SWH equipment that improves upon ASHRAE 90.1 minimum required efficiencies.

To confirm compliance, identify all equipment installed in the project scope that generates cooling, heating (including preheat and reheat), or SWH. Up to 25% of this capacity may be excluded for determination of credit compliance. Also exclude existing unmodified equipment or base building equipment supplying thermal energy to the space.

Calculate the percent improvement in equipment efficiency compared to the referenced version of ASHRAE 90.1 for each installed equipment. For heat pumps that have both heating and cooling efficiencies, use the capacities and efficiencies from both heating and cooling mode.

• ASHRAE 90.1, Section 6.8 Tables for heating and cooling efficiencies

• ASHRAE 90.1, Section 7.4 Tables for SWH

Efficiency improvement is 0% for electric resistance heating in baseboards, fan coils, VAV reheat, or air handling units.

Either achieve a 15% improvement for each individual equipment, totaling at least 75% of total installed capacity, or achieve a 15% weighted average efficiency improvement encompassing at least 75% of total installed capacity.

Equation 1. Weighted average % improvement

Equation 1. Weighted average % improvement 𝑊 𝑊 ℎ𝑡 𝑡 a𝑣 𝑣 𝑣 % 𝑖 𝑖 𝑖 𝑖 𝑖 𝑖 =

∑(𝑟 𝑟 𝑟 𝑐 𝑐 𝑐 𝑐 𝑜 𝑒 𝑒ℎ 𝑒 𝑒 𝑒 𝑒 𝑒 × % 𝑖 𝑖 𝑖 𝑖 𝑖 𝑖 𝑓 𝑓 𝑒 𝑒ℎ 𝑒 𝑒 𝑒 𝑒 𝑒) (𝑡 𝑡 𝑡 𝑟 𝑟 𝑟 𝑒 𝑒 𝑒 𝑒 𝑒 𝑐 𝑐 𝑐 𝑐 𝑜 𝑎 𝑎 𝑒 𝑒 𝑒 𝑒 𝑒)

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 170