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--></style></head><body lang="EN-US" link="#0563C1" vlink="#954F72"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">If you are interested in stepping up the accuracy of your daylighting simulations way up, and already know a thing or two concerning photometric studies (or are willing to learn), then check out SPOT.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">SPOT is an excel-driven GUI to Radiance. It has grown recently into a (for-cost) product that, given a multitude of pertinent inputs concerning actual daylighting sensor + fixture placements, windows, zoning, and the sort of inputs typical for a photometric analysis, will perform an annual set of hourly simulations to determine actual daylighting behavior. Among many outputs, it generates fractional schedules for use in doe2/energyplus to match its findings which you can subsequently import/assign.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">Be cautioned: a SPOT analysis for every typical space type however is <b>no light amount of work</b>, and is probably inappropriate for many simulation scenarios when a faster approximation is going to be fine.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">I will also add/supplement: You might be surprised to find that the various LTG-CTRL-METHOD options for fluorescent/MH/HPS dimming for daylighting in eQUEST all produce perfectly linear part load curves when LTG-CTRL-TYPE is ‘Continuous.’ If you want to modify any of these to behave more like LED/incandescent sources, specify the minimum power and minimum light output fractions to be zero or something quite close like 0.02 (I recall the last LED dimming driver I looked up had a minimum output/input around 2%).</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">I’m not certain (and would like to learn) whether it’s possible to assign a non-linear (i.e. quadratic) curve for daylight dimming with DOE-2/eQUEST. That would actually be a step in the right direction for quickly and more accurately exploring fluorescent vs. LED at a high level.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060">~Nick</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><div><p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#002060">NICK CATON, P.E.</span></b><span style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#1f497d"><br></span><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#561782">Owner</span></b></p><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#561782"> </span></b></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#561782">Caton Energy Consulting</span></b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><br></span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> 306 N Ferrel</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> Olathe, KS 66061</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> office: 785.410.3317</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#561782"><a href="www.catonenergy.com"><span style="color:#561782">www.catonenergy.com</span></a></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"></span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#002060"> </span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>David Griffin II<br><b>Sent:</b> Friday, November 06, 2015 3:39 PM<br><b>To:</b> Haberl, Jeff; Fakeha Sehar; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] LED lighting</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Jeff is spot on. It is a little more tricky if you have dimmable daylight controls as eQUEST only models dimming for fluorescent lights with ballasts whose performance is not as linear as LEDs when dimmed.</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I usually just count the energy savings from dimming LED daylight controls as conservative rather than find a more accurate way of modeling it.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Has anyone employed a more accurate way of modeling this? Are you willing to share?</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Thanks in advance!</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%"><tr><td width="80" valign="top" style="width:60.0pt;padding:0in 9.75pt 0in 0in"><p class="MsoNormal"><a href="http://www.archnexus.com"><span style="text-decoration:none"><img border="0" width="80" height="99" id="_x0000_i1025" src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-logo-80x99.png" alt="ARCH | NEXUS"></span></a></p></td><td width="1" valign="top" style="width:.75pt;border:none;border-left:solid #009ad9 1.0pt;padding:0in 0in 0in 0in"><p class="MsoNormal"> </p></td><td style="padding:0in 0in 0in 6.75pt"><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%"><tr><td colspan="2" style="padding:0in 0in 0in 0in"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#52616e">DAVID W. GRIFFIN II</span></p></td></tr><tr><td colspan="2" style="padding:4.5pt 0in 0in 0in"><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616e">BEMP<br>ENERGY ANALYST</span></p></td></tr><tr><td colspan="2" style="padding:4.5pt 0in 4.5pt 0in"><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616e">2505 E Parleys Way<br>Salt Lake City, UT 84109 </span></p></td></tr><tr><td width="100%" nowrap style="width:100.0%;padding:0in 0in 0in 2.25pt"><p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616e">Office</span></b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616e"> 801.924.5028 </span></p></td><td style="padding:0in 0in 0in 0in"></td></tr><tr><td nowrap colspan="2" style="padding:4.5pt 0in 0in 0in"><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616e"><a href="http://www.archnexus.com"><span style="color:#52616e;text-decoration:none">archnexus.com</span></a></span></p></td></tr><tr><td nowrap colspan="2" style="padding:4.5pt 0in 0in 0in"><p class="MsoNormal"><a href="https://twitter.com/arch_nexus"><span style="text-decoration:none"><img border="0" width="29" height="22" id="_x0000_i1026" src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-tw-sharp-L-29x22.png" alt="Twitter"></span></a><a href="https://www.facebook.com/pages/Architectural-Nexus/179588705397563?ref=ts&fref=ts"><span style="text-decoration:none"><img border="0" width="29" height="22" id="_x0000_i1027" src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-fb-sharp-L-29x22.png" alt="Facebook"></span></a><a href="https://www.youtube.com/channel/UCYRPWKF-yp-AUiI8ia2XfKw?feature=mhee"><span style="text-decoration:none"><img border="0" width="29" height="22" id="_x0000_i1028" src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-yt-sharp-L-29x22.png" alt="Youtube"></span></a><a href="https://www.linkedin.com/company/architectural-nexus"><span style="text-decoration:none"><img border="0" width="29" height="22" id="_x0000_i1029" src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-li-sharp-L-29x22.png" alt="LinkedIn"></span></a></p></td></tr></table></td></tr></table><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Haberl, Jeff [<a href="mailto:jhaberl@tamu.edu">mailto:jhaberl@tamu.edu</a>] <br><b>Sent:</b> Thursday, November 05, 2015 2:20 PM<br><b>To:</b> Fakeha Sehar; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] LED lighting</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Hello Fakeha:</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Simulations programs like eQuest and DOE-2 don’t actually model the lighting, but rather model the heat gain from the lighting. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Therefore, all you really need is the electricity use of the intended lighting to enter into the input file, in one of several ways (i.e., Watts or Watt/ft2), then perhaps enter what type of light it is to estimate where the heat from the light is going. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Jeff</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:blue">8=! 8=) :=) 8=) ;=) 8=) 8=( 8=) 8=() 8=) 8=| 8=) :=') 8=) 8=?<br>Jeff S. Haberl, Ph.D.,P.E.inactive,FASHRAE,FIBPSA,......<a href="mailto:........jhaberl@tamu.edu"><span style="color:blue">jhaberl@tamu.edu</span></a><br>Professor........................................................................Office Ph: 979-845-6507<br>Department of Architecture............................................Lab Ph:979-845-6065<br>Energy Systems Laboratory...........................................FAX: 979-862-2457<br>Texas A&M University...................................................77843-3581<br>College Station, Texas, USA, 77843..............................URL:<a href="http://www.esl.tamu.edu">www.esl.tamu.edu</a><br>8=/ 8=) :=) 8=) ;=) 8=) 8=() 8=) :=) 8=) 8=! 8=) 8=? 8=) 8=0</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Fakeha Sehar<br><b>Sent:</b> Thursday, November 5, 2015 3:00 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] LED lighting</span></p></div></div><p class="MsoNormal"> </p><div><div id="yui_3_16_0_1_1446761213480_2462"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black">I want to model LED lighting in eQuest. Any idea how?</span></p></div><div id="yui_3_16_0_1_1446761213480_2462"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black"> </span></p></div><div id="yui_3_16_0_1_1446761213480_2462"><p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif;color:black"> </span></p></div></div></div></body></html>