Is signage included in the LPD calculations for building façades?
No, per ASHRAE table 9.4.5, you can exclude lights in display windows, advertising, and directional signs as long as they are switched separately from other lighting.
To calculate building façade lighting power density, how do you determine the area used in the calculation?
Use only the area that has measurable light on the surface, baseline and proposed are the same.
What about zero lot line projects, where is the boundary?
You can use the curb line.
What effect did the November 2011 ASHRAE table 9.4.6 Addendum i have on exterior lighting power allowances?
Significant reductions for tradable surfaces in LZ1 and LZ2 and some in LZ3. See the new table for details. It also added lighting power allowances according to light zones, removed a 5% adder, and introduced a base site allowance. Suggest revising response and adding a link to the Addendum i available for free download on ASHRAE website.
Can the Application Guide for Multiple Buildings and On-Campus Building Projects be used for the exterior lighting requirements?
Yes, as long as the entire site meets the requirements.
Do existing fixtures need to be included in the exterior lighting calculations?
Yes, if they are within the LEED project boundary.
Are residential spaces exempt from the interior lighting calculations?
Yes, as of 4/1/12 per LEED for Homes 2008 Interpretation #10147, “residential spaces (dwelling units only) within the scope of other LEED projects are also exempt from the interior lighting requirements.”