5.4.4 Interior Lighting, Standard Design Existing Buildings

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What NACM Section(s) are relevant to this issue?

5.4.4 Interior Lighting, Regulated Interior Lighting Power, Standard Design 
Existing Buildings

5.4.4 Interior Lighting, General Lighting Power, Standard Design Existing 
Buildings

Explanation of issue:

ACM Language for 'Standard Design Existing Buildings' States: 

  For alterations where less than 40 luminaires have been modified, the baseline
  is the existing lighting condition before the alteration.  If 40 or more
  luminaires have been modified, the general lighting power for the baseline is
  defined for each space type in Appendix 5.4B.

This approach is difficult because the data model not track information on how 
many luminaires have been modified.  In addition, this language comes from the 
standards table 141.0-F, which applies only to the special category of 
'Luminaire Modifications in Place'.  This special category will likely not 
apply in most Altered Lighting scenarios utilizing the performance path.  

Proposed resolution:

Utilize the same approach as for determining requirements for daylighting 
controls in Altered lighting situations (see issue 854):

  - When lighting status is 'Existing' - Standard Design LPD same as Proposed
    Design
  - When lighting status in 'New' - Standard Design LPD same as for New 
    Construction
  - When lighting status is 'Altered'
     -IF installed LPD<=85% of standard design LPD: Standard Design LPD same as
      Proposed Design
     -IF installed LPD > 85% of standard design LPD: Standard Design LPD same as
      New Const.

Please provide any additional information below.

Original issue reported on code.google.com by lu...@360-analytics.com on 11 Mar 2015 at 10:00