if i were to have timer control on all my ground lighting at my landscape and parking area, do i still need to include these lighting fixtures into my LPD ?
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Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11477 thumbs up
October 29, 2010 - 3:04 pm
I'm actually not sure if exterior lighting is within the scope of this credit.But if exterior lighitng IS included, why would having a timer on it make it not relevant? It's still going to use power, right? This seems akin to having an occupancy sensor on an interior light.
Dane Sanders
PrincipalClanton Associates
68 thumbs up
October 29, 2010 - 3:48 pm
Hi Jason,
Sorry to take so long to get back to you.
Is your question related to LEED for Commercial Interiors EAcredit 1.1 Optimize Energy Performance? If you are working on a Commercial Interiors project, what exterior lighting do you have that relates to this credit?
It seems that your question is related to LEED for New Construction SScredit 8 Light Pollution Reduction, or EAcredit 1 Optimize Energy Performance. For both of these credits, you must include all lighting loads. For EAc1, the LPD for all lighting connected to the building's power must be included. If you are using controls that exceed the ASHRAE 90.1 2007 Lighting Controls requirements, these would be accounted for in the Energy Model for EAc1.
I hope this helps. If you can clarify your project and which LEED product you are registered for, I may be able to give you better advice.
Thanks,
Dane
Simon Sue
SL+A INTERNATIONAL ASIA INC.411 thumbs up
November 18, 2010 - 2:46 am
Hi Dane,
we have a 2 stories building with a open carpark + a vegetated roof top. the owner would like to apply for LEED CI, therefore , when we doing the LPD, we arent sure we need to include the lighting fixture on the open parking and decorative lighting for the vegetated roof into the whole calculation.
though all these exterior light was connected to a timer.
Dane Sanders
PrincipalClanton Associates
68 thumbs up
November 30, 2010 - 10:17 am
Hi Jason,
Your project sounds unique for a "Commercial Interiors" project. I believe that LEED CI was conceived for tenant finish spaces and not for building grounds, which would be covered by LEED CS.
For your situation, I suggest that you take the more conservative approach. Under LEED CI, the Lighting Power Density is a credit separate from Lighting Controls. For interior lighting, you must include all connected lighting loads, whether they are controlled by daylight sensors, occupancy sensors, or timer controls. For your exterior lighting, this same approach would apply. You should include all exterior lighting in your calculation. The exterior lighting power allowances in ASHRAE 90.1 2007 are very generous. Too generous in my opinion. Our typical exterior lighting projects are 50% - 80% below the ASHRAE exterior LPD allowance, and are still designed to meet IESNA lighting criteria. So, if you include your exterior LPD in the whole calculation, you may find that it improves your % below ASHRAE and may qualify you for more points.
I do not know how a reviewer will interpret this situation, so your Narrative should describe your process thoroughly.
Best of luck,
Dane