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NC-2009 EAp2:Minimum Energy Performance

Interior Lighting power

Hi Markus and colleagues, If in the Proposed building the total interior lighting power (space by space method) is bigger than those of the Baseline, is this acceptable. The exterior lighting is mandatory, but for the interior it is not specifically confirmed. Thanks.

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Mon, 09/14/2015 - 14:25

Dear Vassil, correct, Interior lighting power densities are not mandatory, exterior is. Regards.

Tue, 09/15/2015 - 08:40

Thanks for the reply. The main question however remains: If in the Proposed building the total interior lighting power is bigger than those of the Baseline, is this acceptable by reviewers? Thanks
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 09/15/2015 - 13:08

All prescriptive (non-mandatory) requirements are eligible for trade-off. This means you can exceed the prescriptive requirement. Exterior lighting is mandatory so you cannot exceed those requirements. So the reviewer will be fine with the proposed interior lighting power density and energy use exceeding the baseline. For future reference the mandatory provisions are in sections that end in X.4 and the prescriptive end in X.5 or X.6.

Tue, 09/15/2015 - 13:41

Marcus, Thanks a lot, just wanted to be sure. Final question on lightung. If the exterior lighting of the proposed is higher than baseline, but at the same time if the total building lighting (interior and exterior) of the Proposed results in lower value than those of the Baseline (meaning that interior saving compensates exterior), could this be acceptable. Thanks.
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Tue, 09/15/2015 - 13:50

No. The exterior lighting is a mandatory provision and must be less than or equal to the baseline. The interior lighting performance does not impact compliance with the mandatory exterior lighting.

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