Leed 2009 exterior lighting

asked 2016-11-15 09:18:06 -0500

Sarah
31 ●1

Hi,

The LEED 2009 exterior lighting requirements leave me a bit puzzled. Here is my situation:

The proposed building design has only exterior lighting on non-tradable surfaces, with installed power of 0.7 kW and no exterior lighting on tradable surfaces.
Credits cannot be taken for non-tradable surfaces, nor for tradable surfaces when the proposed model does not plan lighting there. Therefore, my baseline model has only the 0.7 kW for non-tradable and 0 kW for tradable. Correct?
The building is located in "zone 4", with a base allowance for exterior lighting of 1.3 kW.

I receive issues/comments by the excel sheet, that I am not fullfilling the mandatory requirements according to 9.4.5. If I understand it correctly, I can have up to 1.3 + 0.7 kW in the baseline model? However, I am not allowed to assign it to either non-tradable or tradable surfaces?

Some feedback on this is greatly appreciated!

Regards,

Sarah

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answered 2016-11-18 07:40:38 -0500

Nick Caton
516 ●2 ●4

To my reading: You are correct to assert 0.7 kW for both proposed and baseline cases. "Zone 4" serves only to define the base allowance plus the allowances associated with your nontradable surfaces (likely building facades).

Technically for LEED 2009, I think you should reference 90.7-2007 addendum i, but for simplicity you could also just look to 90.1-2010 Tables 9.4.3A/B and the associated passage.

The exterior lighting power allowance will be 1.3 + (some multiplied value for tradable surfaces). That allowance cannot be exceeded by your 0.7 kW of installed power (so you should be in the clear). This understanding might be the source of the "warning" being thrown in the spreadsheet - perhaps you need to enter your lighting allowance inputs differently?

I will insert however that it's kinda weird that you have absolutely zero tradable surfaces (unless you're asserting that for simplification reasons)... no illuminated main entry?