Can I use the ASHRAE table and methodology of demonstrating LPD compliance? SS8 states that “Lighting power densities must not exceed ANSI/ASHRAE/IESNA Standard 90.1-2007 (with errata but without addenda) for the classified zone”. ASHRAE provides a table and methodology of demonstrating LPD compliance that is relatively simple, flexible, and straightforward. The methodology shown as Example Table 2 in the LEED 2009 Reference Guide seems much more difficult in comparison. The Guide appears to require that each Application Area (Application Area = Classified Zone? – this isn’t defined in the Guide) be fully calculated as an individual element. For a site that contains multiple Application Areas, and has individual lights that spill across several Areas, the documentation task is formidable. Further, the Guide doesn’t appear to include the provision for tradable areas that is in ASHRAE, so a localized ‘hot spot’ may render the entire project out of compliance when the net power over the net area is actually fine.

Also, Example Table 2 in the Guide contains references to Required LPD Reduction that appears to be a holdover from LEED 2.2, and is not applicable to LEED 2009. Am I misinterpreting something?