<div dir="ltr">Norman,<div><br></div><div>good morning.  We're going through this exact process right now here at UofMichigan in the older portion of our cleanroom, as part of the project when we replace the HEPA filters.  It's been a long learning curve to get to the final answer.  We've also reevaluated our "yellow" light capability and found that what we were using wasn't as effective as we thought, and we needed to be more "orange" to filter out the blue spectrum.  When we decided to change the color, it was obvious that we needed more lamps to get the lumen output back up where it wasn't like working in a closet.  We found a local (Michigan area) lighting manufacturer that is remaking the tombstone support brackets to increase our lamp count from 2 bulbs to 4 bulbs, in various strategic fixtures throughout the lab, and we're installing an improved tombstone with the retrofit.  They had their UL guy take a look at what we wanted to do, and we've been told that our old fixtures, with the extra bulbs, will still meet the UL listing requirement that our inspectors are requiring, provided we install the LED bulbs as per specification.</div><div><br></div><div>We've been looking at changing over all of our mechanical spaces to LED as well, and we've found that some of the fixtures have the lamp pins oriented vertically, and not horizontally.  For fluorescent tubes, this isn't a big deal because they generate light 360 degrees.  For the LED lamps, there's a blank spot on the "top" of the tube where no light is generated.  We're currently testing the functionality of using the LED lamp in a "90 degree out of rotation" installation.  So far, it seems to work just fine, both in operation, and in light generation.<br></div><div><br></div><div>I've attached the cut sheets on the T-8 replacement LED lamps (direct wire 277 LED that fit a T-12 and T-8 socket) we're using, along with the T-5 LED equivalent we're looking at (these still require a ballast).  I've also included the information I've compiled on the "yellow/orange" filters that we're still evaluating.  I've found that not all of the tube filters that fit a T-8, or T-5, fluorescent tube, will fit over their respective LED replacement.  For the filters, be prepared to see a huge variation in pricing, both in quantity, and from manufacturer.</div><div><br></div><div>If you'd like to come out and take a look at what we've done (the cleanroom won't be fully retrofitted with new filters and lamps till late April), just give me a call.</div><div><br></div><div>By the way, just to give you some idea of the scope we're talking about, in just the cleanroom there are 197 lighting fixtures, and the mechanical spaces add about another 150 fixtures.</div><div><br></div><div>Thank you,</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div>Dennis Schweiger</div><div>Facilities Manager</div><div>University of Michigan/LNF</div><div>1301 Beal Ave.</div><div>Ann Arbor, MI 48109</div><div> </div><div>734.647.2055 Ofc<br></div></div></div>
<br><div class="gmail_quote">On Tue, Jan 31, 2017 at 12:50 PM, Bergren, Norman F. (Fed) <span dir="ltr"><<a href="mailto:norman.bergren@nist.gov" target="_blank">norman.bergren@nist.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



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Hi,
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<div>We would like to change out our cleanroom lighting (T5) 277v to LEDs.  Any suggestions on what to use? Does anyone have experience with a change out? I saw</div>
<div>Carnegie Mellon  and University of Chicago’s new installation and they seemed well done.</div>
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<div>Thanks</div>
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<div>Norm</div>
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<div><span><img height="28" width="107" id="gmail-m_-4189547158961993409D49AED82-40A1-4023-A0A8-73E57DE13B64" src="cid:image001.png@01D15F30.2A5E7F40"></span><br style="color:rgb(0,0,0);font-family:helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
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<span style="color:rgb(0,0,0);font-family:helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline">******************************<wbr>******</span><br style="color:rgb(0,0,0);font-family:helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<span style="color:rgb(0,0,0);font-family:helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline">Norman
 F. Bergren</span><span style="color:rgb(0,0,0);font-family:helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline"> </span><br style="color:rgb(0,0,0);font-family:helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
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<span style="font-family:helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline"><font color="#0433ff"><a href="mailto:bergren@nist.gov" target="_blank">bergren@nist.gov</a> </font></span><br style="color:rgb(0,0,0);font-family:helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
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