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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It is my understanding that exterior façade
lighting needs to be modeled identically in both baseline and design case
models, and that the design case façade lighting needs to meet the requirements
of Table 9.4.5. Credit can be taken for the tradeable surfaces.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Eric<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=black face=Calibri><span
style='font-size:10.0pt'>Ph: (781) 431-1100 ext 12<br>
Fax: (781) 431-1109</span></font><o:p></o:p></p>
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style='font-size:11.0pt'> </span><o:p></o:p></font></p>
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<p class=MsoNormal><b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:windowtext;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:windowtext'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>"near_ej@yahoo.com"<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, July 22, 2009
12:24 AM<br>
<b><span style='font-weight:bold'>To:</span></b> VSami@lasarchitect.com<br>
<b><span style='font-weight:bold'>Cc:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] Exterior
lighting power</span></font><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman";color:windowtext'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Calibri><span
style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
11.0pt;font-family:Arial'>Hi Vikram,<br>
Don't know if you already have an answer to this.<br>
<br>
Anyways, this is what my understanding is -- The lighting power for tradable
surfaces / tradable linear feet would need to be calculated for all such
surfaces / linear feet. Since facades fall in the non-tradable surfaces
category, one would need to consider only the facade that you are planning to
light-up in the Designed case. This is confirmed by the fact how the text in
the Table is read as:<br>
<br>
". . . for each illuminated wall or surface . . ."<br>
<br>
Besides that, to comply with the light pollution reduction credit point (SSc8),
the lighting power needs to be half of what the Table you referenced is, i.e.
0.1W/sf for each illuminated wall or surface or 2.5W/ft for each illuminated
wall or surface length. Finally, to further comply with SSc8, all other
surfaces / linear feet need to be 80% of what is referenced in the Table 9.4.5.
There are other SSc8 credit requirements that I won't go into right now,
considering you are perhaps looking at this from the perspective of energy modeling.<br>
<br>
Hope rest is all well with you.<br>
<br>
cheers,<br>
Neeraj</span></font><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><br>
<br>
Neeraj Kapoor<br>
t: +91.99581.70018<br>
Kalpakrit Sustainable Environments Pvt. Ltd.<br>
<st1:place w:st="on"><st1:City w:st="on">New Delhi</st1:City>, <st1:country-region
w:st="on">India</st1:country-region></st1:place><br>
</span></font><br>
<br>
Vikram Sami wrote: <o:p></o:p></p>
<div>
<p class=MsoNormal><font size=2 color=black face=Calibri><span
style='font-size:11.0pt'>James Hess brought up a point about exterior lighting
power in 90.1-2004 models. I’m currently finishing up a LEED 2.2 model, and am
setting up my exterior lighting loads for my base building. I used table9.4..5
to calculate the allowable exterior lighting for this and it comes out to 4.6
kW for a 10,00 ft2 building. Seems high. The biggest part of this load is the
building façade component which allows 0.2 w/lf for the facades. How do you
calculate this – do you assume ALL the facades of the base building will be lit
– even if they are not lit in the designed building? <o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=3 color=black face=Garamond><span
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</span></font><font size=3 face=Garamond><span style='font-size:12.0pt;
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</span></font><o:p></o:p></p>
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