Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
ASHRAE 90.1 does not regulate dwelling unit lighting power, so strictly following Appendix G modeling you would keep the lighting power the same in both models. (Note: the 0.6 W/SF is for multifamily whole-building method, so that's the value that would apply to common areas, corridors, etc. Just not dwelling units).
As with everything ASHRAE, the Rating Authority can provide a methodology for showing savings for unregulated loads. LEED Interpretation 1712 has provided an exceptional calculation methodology that I've used in the past to show savings for hard-wired dwelling unit lighting, however as you can see that applies to V2 and V3 projects only. I'm not sure if there has been a similar interpretation for LEED V4 projects.
| | 2 | No.2 Revision |
ASHRAE 90.1 does not regulate dwelling unit lighting power, power*, so strictly following Appendix G modeling you would keep the lighting power the same in both models. (Note: the 0.6 W/SF is for multifamily whole-building method, so that's the value that would apply to common areas, corridors, etc. Just not dwelling units).
As with everything ASHRAE, the Rating Authority can provide a methodology for showing savings for unregulated loads. LEED Interpretation 1712 has provided an exceptional calculation methodology that I've used in the past to show savings for hard-wired dwelling unit lighting, however as you can see that applies to V2 and V3 projects only. I'm not sure if there has been a similar interpretation for LEED V4 projects.
*This (PDF link) ASHRAE interpretation.
