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Thread: Ring shaped Lighting Family

  1. #1
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    Lightbulb Ring shaped Lighting Family

    Hi everyone,

    I have a ring shaped Lighting Fix. with IES file. Do you have any suggestion how to define ring shaped light source with IES file? If i choose Circle from Emit Shape and define Photometric Web as distribution, I can just define round shape which shine trough all diameter (see attached photo).

    For now I've just came up with the solution to create self-illuminating material and don't use IES at all, but this solution is quite inconvenient if I have more types with different lm, K...


    thanks
    Attached Thumbnails Attached Thumbnails Ring shaped Lighting Family-untitled.png  
    Last edited by BIM_grl; December 4th, 2017 at 03:02 PM.

  2. #2
    Forum Addict josephpeel's Avatar
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    Is it possible to use multiple small point IES sources around the ring? The ring must have individual bulbs in it.

    If its not possible....approximate! (Basically all engineering)
    Last edited by josephpeel; December 5th, 2017 at 10:03 AM.

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    Yeah, but that would mean several nested IES inside which makes file really heavy. Thank for suggestion though

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    Forum Co-Founder Twiceroadsfool's Avatar
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    It won't make it "really heavy," but it will make it correct.

    Sent from my Phablet. Please excuse typos... and bad ideas.

    Aaron Maller
    Director
    Parallax Team, Inc.

  5. #5
    Moderator snowyweston's Avatar
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    Given "accuracy" is a massively contentious condition of (modelling) lighting (with any rendering package) I've still not found a need to use IES files over Revit light sources or self-illuminating materials... are you running ElumTools and/or exports to something more intelligent?

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    Quote Originally Posted by josephpeel View Post
    ... multiple small point IES sources around the ring?
    Maybe I'm misunderstanding, but I thought the process to generate an IES file was to physically measure the output of the fixture with a goniophotometer (measures light output at different angles) as manufactured, all lamps included. So a single fixture could have multiple IES files based on the lamping arrangement, but each file contains the data for all lamps in that arrangement. I've always used one (matching) photoweb per manufacturer fixture. For example, a linear row of 8'-8'-8'-4' pendants would utilize the 8' IES file (3) times, and a 4' ies file (1) time. As the IES data is measured from the center of the fixture, that's where I align the web.
    BIM_grl and josephpeel like this.

  7. #7
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    Quote Originally Posted by cellersick View Post
    ...each file contains the data for all lamps in that arrangement...
    As I know this is as you understand, yes. I also have IES for whole outer ring, which is useless in this case.

  8. #8
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    As I agree that the most realistic option is like Joseph suggested (small point IES sources around the ring), we decided that optimal approach is to add several segmented IES (rectangular Emit shape). It look quite good.

    Thank you all for your help

    Attached Thumbnails Attached Thumbnails Ring shaped Lighting Family-l1.png  

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