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CS-2009 EAp2:Minimum Energy Performance

Additional lighting power density in a retail store

Dear All, We are working on a shopping mall project which is pursuing LEED for C&S certification. According to table 9.6.1, maximum lighting power density for retail store is 18 W/sqm plus accent lighting. Since we don´t know which type of sales area is going to use the retail store, can we model the lighting power density considering "Sales Area Type 3" allowance according to table 9.6.2.? We would like to consider 44 W/sqm (Retail Sales Area 18 W/sqm + 26 W/sqm). Such lighting power density is close of what will be available for the tenants for interior lighting. Since there is not lighting design for tenant areas, we are going to use same allowance for baseline and proposed case. Best Regards.

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Thu, 07/02/2015 - 07:43

We had C&S retail spaces without lighting design, where we included the highest additionial lighting power, since this was the worst case in our eyes. the reviewers were of the opinion, that in cases, where no retail lighting has been designed, only the 18 W/m² without any additionial lighting should be chosen. This was 1.5 years ago, since then we proceed in this way and never had a review comment on the 18 W/m².
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Thu, 07/02/2015 - 12:46

Adding more LPD and modeling it identically is certainly the conservative approach. For this reason alone the reviewer should allow you to do so. The higher the neutral, identical energy use, the lower the overall savings.

Thu, 07/02/2015 - 21:05

Thank you very much Johannes and Marcus. Best Regards,

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