Multi-Family Lighting Assumptions

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Question on defining lighting power densities in multi-family residential.
Folks who do a lot of multi-family, let me know if this sounds correct on
the LEED side of assumptions.

1. All common areas 0.7 W/SF in baseline
2. All living units lighting is process loads, same in both cases
3. No decorative fixture allowances

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Arpan

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I have received the following comment from the reviwer:

The LEED Energy Performance Summary report indicates that the interior lighting power density in the multifamily units has not been modeled identically between each model; however, all residential units should be modeled with an identical interior LPD (for both perm anent and portable lighting) in the Proposed and Baseline models , as required by LEED Interpretation 1712. If the residential units are not provided with lighting fixtures in the actual design, the lighting power in the residential units in the Proposed and Baseline models must be modeled identically reflecting the anticipated lighting power in the actual design as required by the exception to Table G3.1.6 (d) in the Proposed building column. If the multifamily units are provided with lighting fixtures, any additional credit taken for more efficient lighting power must be simulated in an additional Proposed model, and the energy consumption savings and energy cos t savings for this measure must be reflected in Section 1.7 of the form as an Exceptional Calculation Measure (ECM). Revise the Proposed and Baseline models so the interior lighting power in the residential units is modeled identically in each model based on the anticipated interior lighting power in the actual des ign. In addition, ensure that the lighting power consumption for the residential units is separated in Table EAp2-4 and Table EAp2-5 of the form. If taking additional credit for interior lighting power provided for the residential units, ensure that the energy savings and energy costs savings are included in Section 1.7 as an ECM, and provide a narrative that includes all assumptions made for both the Proposed and Baseline model, theoretical or empirical information supporting these assumptions, and specific energy cos t savings achieved for this ECM. Further, the Baseline case description must provide evidence (e.g. a published study) that both supports the indicated energy savings and also addresses both the interior lighting density and daily duty cycle. Note that the interior lighting power density for the Baseline case must not be greater than 2 W per square feet

 I have very efficient hard -wired lighting fixtures in all spaces of multi-family units with dimmable controls. In addition to this, all bedrooms have portable lights connected via receptacles. I am trying to understand how to do exceptional method calculation to show savings supported by specific study results.... If anybody can share examples, it would be great!

Genia

EvGenia
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