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Thread: Manufacturer Lights, IES Files, Problem

  1. #41
    Forum Co-Founder Twiceroadsfool's Avatar
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    As i said before, youre trying to draw a line in the sand that doesnt need to be there. If you build GOOD content for Revit, it works for A/E and GC, and MEP, and Structural, and Owner, and Facilities Managers. It. Doesnt. Matter.

    We ARE a GC, and we use (very heavily) a ton of Revit models that we get from Design Teams in A/E. When we do Integrated work where we are the Architects and the GC, we obviously get to use them more and do more with them, but its not because the CONTENT is substandard, its because the modeling techniques and discipline of the design teams is sometimes substandard.

    But, we have ONE LIBRARY in the office, and everyone (Designers, Production Staff, Field Engineers, Preconstruction Estimating, Superintendants, Project Engineers) all use the same one. If its done right, it DOESNT MATTER who its intended user is.

  2. #42
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    Quote Originally Posted by gcandela View Post
    rpmarchitecture,

    I am the new BIM Solution Manager for Schneider Electric the mother company for Juno lighting. Can you tell me which Revit family you used or what Juno light do you want in Revit?
    Back from permit submittals. I would still like to get the fixtures connected to the IES file(s). We had pretty good results just removing that connection. gcandela, the original family that we were using was "M4-MR16-20E+MP400-MR16 (SP)". Any help getting the IES file to render correctly would be greatly appreciated.

  3. #43
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    Sorry for the delay. I recreated the family and it was almost done and the same thing happen again, so we are looking at the IES files now. I will update you this afternoon. Thanks

  4. #44
    Junior Member thewrz's Avatar
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    I've loved the exchange in this thread so far!

    rpmarchitecture, here is a very brief tutorial I wrote on how to make the IES files render correctly in Revit:

    The work around is to change the "initial lumens" value in the IES file from "-1" (meaning it's absolute) to the lumen value of the fixture.

    In my example. I was using the Lithonia 2RTL2 LED light fixture and an absolute IES file (sounds like a terrible vodka) from Lithonia's website. Attached.

    I also compared it to the standard version of this fixture, the 2RT5 with two, 14 watt, T5 fixtures at 3500 Kelvin. Also attached.

    Here's the first go:
    Manufacturer Lights, IES Files, Problem-front-view.jpg

    As you can see. The "absolute" IES file gave us our lovely rainbow we're used to seeing when rendering with absolute IES files in Revit. On the right is the traditional fluorescent IES file with it's initial lumen value set at 2400 (2 x 1200).

    Then I read this little article to get a better understanding of the IES file format:
    http://www.vuw.ac.nz/architecture-on...rd_format.html

    As you can see it explains where the "-1" goes in the IES file. Find it, and you'll be halfway there. So I changed the "-1" to the initial lumen value of the LED fixture of "3300" as stated in the IES file. I added "_AW" to the end of the file for my modified version. Attached.

    Here are the results:
    Manufacturer Lights, IES Files, Problem-front-view-fixed.jpg

    From left to right: Original LED ies file, modified LED ies file, and original fluorescent IES file.

    FROM WHAT I HAVE OBSERVED. The light web appears to have remained intact allowing Revit to render. It will probably not be as accurate since I have monkied with something I do not fully understand (the IES file format).

    However it appears this work-around succeeded.

    I should point out that I do not use Revit as a lighting analysis tool! I only use it for rendering out images to put in promotional material or meetings with clients.

    Currently, we use ElumTools and LightPro in our office to do accurate point-calcs. The former, ElumTools, being a brand new extension that uses the Revit API to link in AGI32's lighting calculation system for accurate point calcs. ElumTools does understand the absolute value and will produce accurately thrown light.

    As always, with all work-arounds, YMMV. Finally, here is the light fixture family:
    http://dl.dropbox.com/u/22838635/Rec...%20-%20RT5.rfa

    Tangent related to previous discussion:
    I did have to re-do a lot of the geometry and other data in this Revit family created by Lithonia. The entire Acuity Brands Lighting library is all over the map. Some have actual Revit extrusions, others have imported sketch up models, other still have their SolidWorks exports! So I am quite familiar with the sub-par offerings from manufacturers...

    Also. I loved the suggestions on materials and parameters. Going to be using that for re-building future manufactures families...
    Attached Files Attached Files
    Last edited by thewrz; December 31st, 2011 at 11:48 PM.
    rkitect likes this.

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