Light Heat Gain Distribution - Input restrictions and definition

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What 90.1 PRM Section(s) are relevant to this issue?

3.4.3 Interior Lighting - Light Heat Gain Distribution

Explanation of issue:

A) The Input restrictions indicate user values are allowed with in a specified 
range, but the range is not specified.

B) Definition of Radiative Faction needs to be clearly defined.  The defintion 
in ASHRAE HOF (on which table 8 is based) differs from the definition in E+.  
See Issue 469 comment #4 for more detail.

Proposed resolution:

A) Clarify if user values are to be allowed, and what restrictions are placed 
on them.

B) Provide definition of radiative fraction consistent with ASHRAE HOF.

Original issue reported on code.google.com by lu...@360-analytics.com on 26 Aug 2014 at 9:09

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A)
I have removed the statement for range. It would be defaults else a wattage 
weighted average, similar to Title-24 rules.
Proposed Amendment: Default values listed in Table 8 shall be used as a default 
when the luminaire categories apply. Where lighting fixtures having different 
heat venting characteristics are used within a single space, the wattage 
weighted average heat-to-return-air fraction shall be used.
Another comment related to this: 90.1 PRM doesn't specify the fixture type or 
luminaire type for the baseline building, hence the baseline would also be a 
wattage weighted average for a space with multiple fixture types.

B) Definition of Radiative Fraction
Please follow the existing implementation for SDD, consistent with ASHRAE HOF-
E+:                        SDD:
Lights,Fraction Radiant = <IntLtgRegHtGnRadFrac> x <IntLtgRegHtGnSpcFrac> 

Original comment by supriyag...@gmail.com on 29 Aug 2014 at 6:41